Bukit Mertajam climate

Name: Bukit Mertajam
Address: MY

Bukit Mertajam is warmest in March, with average highs of 31 °C, and coldest in January, when nights average 23 °C. November is the wettest month (368 mm) and February the driest (131 mm). Figures are 1991–2020 climate normals.

Across a full year Bukit Mertajam averages 2,589 mm of rain and 365 days above 25 °C.

Malaysia · population 212,329 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month March 31 °C
Coldest month January 23 °C
Driest month February 131 mm
Wettest month November 368 mm
Least cloud February 69 % cloud
Hottest on record March 37 °C
Coldest on record January 18 °C
Warmest sea May 30 °C

What to expectBukit Mertajam through the year

Bukit Mertajam changes little through the year. Average daily highs stay between 30 and 31 °C, so no month stands out as a season in the way it would further from the equator.

Counted across a normal year, 365 days a year reach 25 °C, 145 of them reach 30 °C. The warmest reading in the 1991–2020 record is 37 °C, in March.

Rain is strongly seasonal. November averages 368 mm against 131 mm in February — 2.8 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Bukit Mertajam is warmest in May at 30 °C and coldest in December at 29 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	29.6 °C	168 mm	74 %
February	30.5 °C	131 mm	69 %
March	30.7 °C	199 mm	73 %
April	30.3 °C	241 mm	81 %
May	30.1 °C	229 mm	87 %
June	30.2 °C	139 mm	83 %
July	30.0 °C	132 mm	85 %
August	30.0 °C	172 mm	86 %
September	29.4 °C	215 mm	88 %
October	28.8 °C	337 mm	90 %
November	28.8 °C	368 mm	88 %
December	28.9 °C	259 mm	83 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	29.6 °C	22.9 °C	26.0 °C	33.3 °C	18.2 °C	31	11
February	30.5 °C	23.2 °C	26.6 °C	35.2 °C	19.8 °C	28	17
March	30.7 °C	24.0 °C	27.0 °C	36.5 °C	21.4 °C	31	19
April	30.3 °C	24.4 °C	26.9 °C	34.2 °C	22.8 °C	30	16
May	30.1 °C	24.6 °C	27.0 °C	33.1 °C	22.8 °C	31	16
June	30.2 °C	24.4 °C	27.0 °C	33.0 °C	22.6 °C	30	17
July	30.0 °C	24.1 °C	26.8 °C	33.4 °C	22.7 °C	31	17
August	30.0 °C	24.1 °C	26.7 °C	34.6 °C	22.0 °C	31	15
September	29.4 °C	23.9 °C	26.3 °C	33.0 °C	22.2 °C	30	8
October	28.8 °C	23.8 °C	25.8 °C	32.2 °C	22.0 °C	31	3
November	28.8 °C	23.6 °C	25.7 °C	31.0 °C	21.3 °C	30	1
December	28.9 °C	23.1 °C	25.6 °C	31.8 °C	20.2 °C	31	4

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	168 mm	20	12 h/day	74 %	82 %	8.6 km/h	29.3 °C
February	131 mm	18	12 h/day	69 %	80 %	9.7 km/h	29.7 °C
March	199 mm	24	12 h/day	73 %	81 %	9.9 km/h	30.0 °C
April	241 mm	28	12 h/day	81 %	85 %	9.1 km/h	30.2 °C
May	229 mm	26	12 h/day	87 %	86 %	9.1 km/h	30.4 °C
June	139 mm	20	12 h/day	83 %	84 %	9.9 km/h	30.4 °C
July	132 mm	19	12 h/day	85 %	83 %	11 km/h	30.2 °C
August	172 mm	22	12 h/day	86 %	83 %	11 km/h	30.0 °C
September	215 mm	25	12 h/day	88 %	85 %	9.9 km/h	29.7 °C
October	337 mm	29	12 h/day	90 %	88 %	9.4 km/h	29.5 °C
November	368 mm	28	12 h/day	88 %	88 %	8.3 km/h	29.3 °C
December	259 mm	23	12 h/day	83 %	85 %	8.2 km/h	29.2 °C

How Bukit Mertajam compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Bukit Mertajam	31 °C	23 °C	2,589 mm	365
Kulim · Malaysia	30 °C	22 °C	2,776 mm	365
George Town · Malaysia	30 °C	24 °C	2,487 mm	365
Paya Terubong · Malaysia	30 °C	24 °C	2,477 mm	365
Kota Kuala Muda · Malaysia	31 °C	23 °C	2,419 mm	365
Sungai Petani · Malaysia	31 °C	23 °C	2,396 mm	365
Taiping · Malaysia	30 °C	23 °C	2,686 mm	365

Where Bukit Mertajam ranks

Ranking	Position	Value
Warmest sea temperatures in Asia in February	3rd of 50	30 °C
Warmest sea temperatures in Asia in March	3rd of 50	30 °C
Warmest sea temperatures in Asia year-round	3rd of 50	30 °C
Warmest sea temperatures in the world in February	3rd of 50	30 °C
Warmest sea temperatures in the world in March	3rd of 50	30 °C
Warmest sea temperatures in the world year-round	3rd of 50	30 °C

Planning a trip? See the best time to visit Bukit Mertajam.

QuestionsCommon questions about Bukit Mertajam’s climate

When is the best time to visit Bukit Mertajam?

That depends on what you want, so the honest answer is a comparison rather than a single month. October, November, December sit closest to 20 °C on average, March is the warmest month and February the driest. The month-by-month table above has the full picture.

How hot does Bukit Mertajam get?

In March, the warmest month, daily highs average 31 °C. About 145 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average 23 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Bukit Mertajam?

November, averaging 368 mm over 28 days with rain. The driest month is February with 131 mm. The year as a whole averages 2,589 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Bukit Mertajam rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Data point: 5.363°, 100.467° (the coordinates the reanalysis values are taken for)
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.