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By Jason Lim, REN 84424 · IQI Realty · Checked on 4 November 2026
This guide is for buyers and owners from Singapore, Indonesia, India, China and elsewhere who want to know what Johor Bahru’s weather means for a home. The short answer: JB is hot and humid all year, with daytime highs of about 30 to 32°C, rain in every month and the heaviest rain from November to January. Haze from regional fires can arrive between about July and October, as it did for weeks in 2026. That should shape which unit you choose and how you look after it.
Quick answer
- Temperature and rain: at Changi, just across the Strait, 1991–2020 mean daily highs run from 30.5°C to 32.4°C, with about 2,100 mm of rain a year; December is wettest and February driest.
- Monsoon: MetMalaysia said the 2026/2027 northeast monsoon began on 27 October 2026 and would last until March 2027, with three to five spells of continuous heavy rain from November to January.
- Haze: MetMalaysia puts peak risk at July to September. In 2026 Johor stations read “unhealthy” (API 101–200) on many days in September and October, then moderate by 30 October.
- Where to check: DOE’s APIMS portal for the Air Pollutant Index, MetMalaysia’s myCuaca app for warnings and NADMA’s Portal Bencana during floods.
- For your home: check which way it faces, cross-ventilation, window and balcony seals, drainage and, for landed homes, the roof.
JB’s climate month by month
MetMalaysia’s Johor station is at Senai International Airport, about 25 km from the city. I could not find its monthly normals published online in November 2026, so the table uses the nearest official long-term record: Meteorological Service Singapore’s Changi climate station, 1991–2020, across the Johor Strait. Treat it as a close guide, not a JB measurement.
| Month | Mean rainfall (mm) | Mean daily max / min (°C) | What it usually feels like |
|---|---|---|---|
| January | 221.6 | 30.6 / 24.3 | Northeast monsoon; wet early in the month, drier later |
| February | 105.1 | 31.5 / 24.6 | Driest month; the monsoon’s drier phase |
| March | 151.7 | 32.2 / 24.9 | End of the monsoon; heat builds |
| April | 164.3 | 32.4 / 25.3 | Hottest days; afternoon thunderstorms |
| May | 164.3 | 32.3 / 25.7 | Warm nights; thunderstorms |
| June | 135.3 | 31.9 / 25.7 | Southwest monsoon; drier, with early-morning squalls |
| July | 146.6 | 31.4 / 25.4 | Southwest monsoon; haze risk begins |
| August | 146.9 | 31.4 / 25.3 | Southwest monsoon; haze risk |
| September | 124.9 | 31.6 / 25.2 | Haze risk; end of the southwest monsoon |
| October | 168.3 | 31.8 / 25.0 | Inter-monsoon; thunderstorms; rain picks up |
| November | 252.3 | 31.2 / 24.6 | Wet; northeast monsoon begins |
| December | 331.9 | 30.5 / 24.3 | Wettest month; long rainy spells |
This matches MetMalaysia’s description of most of the peninsula: a main rain peak around October and November, a smaller one in April and May, and drier spells in February and June to July. Average temperatures vary by less than 2°C over the year. Humidity is what newcomers notice most: at Changi it averages around 82%, is often above 90% before sunrise and falls to about 60% on a dry afternoon. That is why mould and aircon come up again below.
The monsoons and the months in between
Malaysia has two monsoons and two shorter inter-monsoon periods. Dates move each year; these are MetMalaysia’s 2026 dates where it announced them.
| Season | Roughly when | What it means in JB |
|---|---|---|
| Northeast monsoon | 27 October 2026 to March 2027 (MetMalaysia) | The wettest stretch. Days of steady rain, mainly November to January, then a hotter, drier phase. |
| Inter-monsoon | About April to May | Light winds, hot mornings and strong afternoon or evening thunderstorms. |
| Southwest monsoon | 14 May to September 2026 (MetMalaysia) | Fewer rainy days, early-morning squall lines from the Straits of Malacca, and the main haze risk. |
| Inter-monsoon | About October to November | Thunderstorms again, usually wetter than the April–May period. |
The 2026/2027 outlook
On 23 October 2026, MetMalaysia expected three to five episodes of continuous heavy rain from November to January, with possible flooding near rivers and in low-lying areas, and less rain from January to March. On 27 October a MetMalaysia senior director named eastern Johor among the areas at higher flood risk.
El Niño adds a twist. In July 2026, MetMalaysia’s director-general said Johor and Melaka could get 20 to 40% less rain this monsoon, and in October MetMalaysia warned that late January to March 2027 could be hotter and drier, with more risk of heatwaves and water shortages. Less rain overall does not rule out heavy spells, so prepare for both.
Thunderstorms and flash floods
Thunderstorms happen all year but are most frequent in April–May and October–November. MetMalaysia explained in August 2026 that they can build within one to two hours over 1 to 10 km, so warnings often come shortly before the rain. In the southwest monsoon, squall lines from Sumatra can cross between the early hours and midday, with gusts of 40 to 80 km/h, as the Singapore weather service describes.
For homes, the main effect is flash flooding on low roads after a few hours of intense rain; JB city saw short flash floods in December 2023, December 2025 and September 2026. My flood risk guide for Johor Bahru covers the official tools, past floods by area and how to check a specific home. For this monsoon, NADMA said on 30 October 2026 that 8,321 temporary relief centres were ready nationwide; during a flood, its Portal Bencana shows affected areas and open relief centres (PPS).
Haze and the Air Pollutant Index
Haze in JB is mostly smoke blown in from land and forest fires elsewhere in the region, plus local open burning. MetMalaysia said in May 2026 that the risk peaks from July to September. Its strength varies by year, and 2026 was a heavy one.
How to read the API
Malaysia’s official measure is the Department of Environment’s (DOE) Air Pollutant Index (API). In October 2026 the environment minister told Parliament it covers six major pollutants at 68 automatic stations, updated hourly. The highest pollutant sub-index becomes the API; during haze that is almost always fine particles (PM2.5).
| API | Category | Practical meaning at home |
|---|---|---|
| 0–50 | Good | Air the home. |
| 51–100 | Moderate | Normal for most people. |
| 101–200 | Unhealthy | Many residents keep windows shut. |
| 201–300 | Very unhealthy | Johor said in September 2026 that schools close above 200. |
| Above 300 | Hazardous | Follow official instructions. |
PM2.5 in the API is a 24-hour moving average, so visible haze can worsen before the number moves. Phone apps showing an “AQI” use other scales and sensors, so their numbers will not match. If anyone at home has asthma, heart or lung conditions, ask your doctor about haze days and follow Ministry of Health and DOE advice.
Where to check
- DOE APIMS: the APIMS portal, part of DOE’s MyEQMS system, shows the latest API by station; Larkin and Pasir Gudang are the stations near the city. DOE also points the public to its MyJAS EQMS app.
- ASEAN Specialised Meteorological Centre (ASMC): hotspot maps, the regional haze situation and alert levels. On 4 November 2026 it showed the southern ASEAN region downgraded to Alert Level 2.
- MetMalaysia: met.gov.my, the myCuaca app and the 1300 22 1638 hotline for forecasts and warnings.
What happened in 2026
ASMC raised its southern ASEAN alert to Level 2 on 3 August 2026 and to Level 3, its highest, on 26 August. By 13 October, satellite hotspots in Kalimantan and Sumatra had reached 38,511 for the year, a decade high by ASMC’s data, and DOE said smoke from those areas was causing Malaysia’s haze. Johor was among the worst affected states: on 19 September Larkin read 158 and Pasir Gudang 154, and all Johor schools closed on 8–9 October and 12–16 October by the Regent’s decree. By 30 October every Johor station was back in the moderate range.
Heat
MetMalaysia names Perlis, Kedah, northern Perak and inland Kelantan and Pahang as the most heat-prone areas, not Johor, but JB’s warm nights and humidity make heat feel stronger. MetMalaysia’s lowest hot-weather status, Waspada, applies when daily highs stay at 35 to 37°C for at least three days, and its heatwave status at 37 to 40°C (RTM, April 2026). In July 2026 MetMalaysia said a very strong El Niño could bring temperatures above 35°C from February to May 2027. Check its heat status page then, and service the aircon before the hot season.
Want a home that copes well with JB’s weather?
Tell me the area, your budget and whether you want a condo or landed home. I’ll shortlist units and tell you which way they face, the floor level and what I know of the area’s flood history.
WhatsApp JasonWhat this means for choosing a home
At viewings I check the same climate points every time. Together they decide how comfortable a home is and what it costs to run.
Orientation and west sun
Near the equator the midday sun is overhead, so the hardest heat on walls and glass comes from the low afternoon sun on west-facing sides. Rooms with large west-facing glass stay warm into the evening and need more aircon; north- and south-facing units get gentler light. If you want a west view, look for deep balconies, shading, tinted glass and blackout curtains. Ask for the floor plan with a compass point, and view at 4 or 5pm if you can.
Cross-ventilation
Windows on two sides, or a corner unit, let breeze through and dry the home faster after rain. Units with windows on one side only, or bedrooms facing an internal air well, tend to feel stuffy. Check that kitchen and bathroom fans vent outside.
High floor or ground floor?
| Choice | Climate pluses | Climate minuses |
|---|---|---|
| High-floor condo | More breeze and usually less damp; floodwater stays well below you | More wind-driven rain on windows; top floors take roof heat |
| Mid-floor condo | Shaded by floors above and below; a balance of breeze and heat | Views and breeze depend on neighbouring blocks |
| Ground floor or landed home | Garden and outdoor space | Flash floods on low streets and rising damp; check the floor level against the road |
Windows, balcony doors and seals
Wind-driven rain finds weak seals. Look for stains or bubbling paint below windows, swollen skirting and rust on sliding-door tracks, and check that the balcony slopes to a working drain. In a new home, test this at handover with my vacant possession defect checklist; for a subsale home, use my subsale house inspection guide.
Landed homes: roof, gutters and waterproofing
- Roof: cracked or slipped tiles, rusty sheets and stained ceiling boards often mark a past leak.
- Gutters and downpipes: they must cope with short, very heavy downpours; ask when they were last cleared.
- Flat roofs and terraces: ponding water is a warning sign for the waterproofing.
- Bathrooms and wet kitchens: damp patches behind or below point to failed waterproofing.
- Drainage: the porch and garden should slope away from the house to a clear drain.
My renovation and furnishing costs guide has 2026 price ranges for waterproofing and air-conditioners, and my comparison of condo, landed and SOHO homes covers maintenance.
Looking after a home in JB’s climate
- Aircon: TNB advises cleaning filters regularly and setting units at 24 to 26°C (February 2026). Have them serviced on the maker’s schedule, ideally before the hot months.
- Damp and mould: the US Environmental Protection Agency suggests indoor humidity below 60% and drying wet areas within 24 to 48 hours. In JB that means the aircon or a dehumidifier in closed rooms, airing on dry days and leaving wardrobe doors ajar.
- Termites: they like warm, damp ground, so watch landed homes and timber fittings for mud tubes, hollow-sounding wood and discarded wings, and use a licensed pest-control company.
- Haze days: close windows and clean aircon filters after the season.
- Before the monsoon: clear balcony drains, gutters and porch drains.
- Empty homes: a closed unit grows mould quickly. My guide to managing a JB property from overseas has a monthly routine for your contact.
- Insurance: check that your policy names flood and storm damage; see my property insurance guide.
Running costs: aircon drives the bill
Air-conditioning is usually what drives a JB electricity bill. Under the tariff in force from 1 July 2025 to 31 December 2027, most homes pay 44.43 sen per kWh before adjustments and tax, with a RM10 retail charge above 600 kWh a month. TNB said in October 2026 that from September to 31 December 2026, households using 800 kWh or less skip the fuel adjustment, retail charge and 8% service tax. Water from Ranhill SAJ costs RM1.05 per m³ for the first 20 m³.
A unit that avoids the west sun, has cross-ventilation and good seals needs less cooling every month. See my guide to utilities and internet when moving in and my cost of living guide. Foreign buyers should also note that foreigners can generally buy Johor homes only from RM1 million, with exceptions such as designated zones (New Straits Times, April 2026); my foreigner minimum price guide has the details.
Where to buy if this matters to you
- JB Sentral and Bukit Chagar: high-rise living near the CIQ; some low city roads have flash-flooded, so check access routes.
- Danga Bay: waterfront towers; look closely at window seals, balcony drainage and which way the unit faces.
- Mount Austin: a mix of condos and landed homes; for landed, check roofs, drains and the floor level against the road.
- Iskandar Puteri: newer townships, where a careful handover inspection matters most.
- Permas Jaya and Senibong: east-side condos and landed homes; check the area’s flood history and the unit’s orientation.
- Gated and guarded landed homes: strata and guarded schemes explained.
Compare areas on my JB property map or my guide to the best areas to live in JB.
More Johor living guides: Flood risk in JB · Utilities and internet when moving in · Cost of living in JB · Retiring in JB
Frequently asked questions
What is the weather like in Johor Bahru?
Hot and humid all year. At Changi, just across the Strait, 1991–2020 mean daily highs run from 30.5 to 32.4°C and lows from 24.3 to 25.7°C, with about 2,100 mm of rain a year. December is usually wettest and February driest (Meteorological Service Singapore).
When is the monsoon season in Johor Bahru?
The northeast monsoon is the wet season. MetMalaysia said the 2026/2027 monsoon began on 27 October 2026 and would last until March 2027, with three to five spells of continuous heavy rain from November to January. The southwest monsoon, from 14 May to September in 2026, is drier.
When is haze season in Johor?
MetMalaysia puts the main haze risk at July to September, during the southwest monsoon. In 2026 haze lasted into October: Johor schools closed on 8 and 9 October and from 12 to 16 October, and air quality was back to moderate by 30 October.
How do I check the air quality (API) in Johor Bahru?
Use the Department of Environment’s APIMS portal, part of its MyEQMS system, and check the Larkin and Pasir Gudang stations near the city. An API of 0 to 50 is good, 51 to 100 moderate, 101 to 200 unhealthy, 201 to 300 very unhealthy and above 300 hazardous.
Is a high-floor condo better for JB’s climate?
Often, for breeze, damp and flood water. But high floors take more wind-driven rain on windows, and flooded roads or power cuts can still affect you. Facing and ventilation matter as much as the floor.
How can I keep mould out of a JB home?
Keep indoor humidity below 60%, as the US Environmental Protection Agency suggests, using the aircon or a dehumidifier. Dry any leak within 24 to 48 hours and have empty units checked monthly.
Choosing a home in JB?
Tell me the area, your budget and what matters most: cooler rooms, a high floor or a garden. I will shortlist homes and share their facing, floor level and the area’s flood history before you view. You can also book an appointment for viewings, or a Zoom consultation if you are still abroad.
Sources: Meteorological Service Singapore, Climate of Singapore (Changi climate station, 1991–2020 long-term means and seasons), accessed November 2026; MetMalaysia, Malaysia’s climate (general climate description), accessed November 2026; MetMalaysia, Johor Meteorological Office (Senai), accessed November 2026; The Star, “Start of Northeast Monsoon expected on Oct 27, MetMalaysia says”, 23 October 2026; The Star (Bernama), “Super El Nino: Malaysia at risk of hotter, drier weather from late January to March 2027”, 27 October 2026; Bernama, “El Nino: Johor, Melaka expected to have 40 pct less rain”, 28 July 2026; The Iskandarian, on MetMalaysia’s El Niño outlook for Johor (heat-prone areas), 30 July 2026; The Star, “Southwest Monsoon starts May 14, lower rainfall until September, says MetMalaysia”, 11 May 2026; Malay Mail, why Malaysia keeps getting thunderstorms in the dry season, 3 August 2026; Bernama, “Northeast Monsoon: over 100,000 rescue personnel on standby for possible floods”, 30 October 2026; MyGOV, NADMA disaster portal, updated 21 October 2026; The Star, “Haze: 16 areas nationwide record unhealthy API readings as at 5pm”, 19 September 2026; Sinar Daily via Newswav, why MyEQMS and other apps show different haze readings, 6 October 2026; Malay Mail, environment minister on the official API in Parliament, 22 October 2026; Malay Mail, Johor to shut schools if API hits 200, 7 September 2026; The Star, “Smoke from Kalimantan, Sumatra hotspots causing haze in M’sia, says DOE”, 30 September 2026; The Star, “Hotspots in Kalimantan, Sumatra hit decade high” (ASMC data), 15 October 2026; The Star, “Haze: All schools in Johor to remain closed for another five days from Oct 12-16”, 10 October 2026; Bernama, “Haze: 30 areas record unhealthy API readings as of 9am”, 20 October 2026; Malay Mail, no areas record unhealthy API as haze eases, 30 October 2026; ASEAN Specialised Meteorological Centre, regional haze situation and alert level, checked 4 November 2026; RTM, MetMalaysia hot-weather status for 27 April 2026 (status definitions), 28 April 2026; US EPA, A Brief Guide to Mold, Moisture and Your Home, updated 18 February 2026; The Star, TNB advises public to use electricity wisely in hot weather, 14 February 2026; Suruhanjaya Tenaga, TNB tariff table, valid 1 July 2025 to 31 December 2027, checked November 2026; TNB press release on the 800 kWh bill protection, 2 October 2026; Ranhill SAJ, water tariff, checked November 2026; New Straits Times, “Foreigners hit Johor property resale wall”, 20 April 2026
Jason Lim, REN 84424, IQI Realty Sdn. Bhd. E (1) 1584/6. General information checked on 4 November 2026, not legal, financial or medical advice. Weather outlooks, air quality and tariffs change; check MetMalaysia, the Department of Environment, NADMA and your utility providers for the latest.