Bangkok climate

Name: Bangkok
Address: TH

Bangkok is warmest in April, with average highs of 35 °C, and coldest in December, when nights average 21 °C. September is the wettest month (241 mm) and December the driest (9.5 mm). Figures are 1991–2020 climate normals.

Across a full year Bangkok averages 1,176 mm of rain and 364 days above 25 °C.

Thailand · population 5,104,476 · 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 April 35 °C
Coldest month December 21 °C
Driest month December 9 mm
Wettest month September 241 mm
Least cloud February 35 % cloud
Hottest on record May 39 °C
Coldest on record December 13 °C

What to expectBangkok through the year

Bangkok has a clear annual cycle: average daily highs run from 31 °C in December to 35 °C in April, a swing of 4.1 °C in mean temperature across the year.

Counted across a normal year, 364 days a year reach 25 °C, 306 of them reach 30 °C. The warmest reading in the 1991–2020 record is 39 °C, in May.

Rain is strongly seasonal. September averages 241 mm against 9 mm in December — 26 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	31.0 °C	15 mm	40 %
February	32.3 °C	14 mm	35 %
March	33.6 °C	40 mm	42 %
April	34.6 °C	71 mm	55 %
May	33.3 °C	135 mm	80 %
June	32.3 °C	131 mm	88 %
July	31.7 °C	138 mm	89 %
August	31.4 °C	147 mm	91 %
September	30.9 °C	241 mm	88 %
October	30.5 °C	194 mm	74 %
November	31.0 °C	41 mm	54 %
December	30.6 °C	9 mm	47 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	31.0 °C	21.5 °C	26.2 °C	35.0 °C	13.5 °C	31	24
February	32.3 °C	23.2 °C	27.6 °C	36.3 °C	15.1 °C	28	26
March	33.6 °C	25.3 °C	29.0 °C	37.7 °C	17.1 °C	31	30
April	34.6 °C	26.6 °C	30.1 °C	38.7 °C	20.9 °C	30	29
May	33.3 °C	26.5 °C	29.4 °C	39.3 °C	23.4 °C	31	29
June	32.3 °C	26.0 °C	28.6 °C	37.9 °C	23.9 °C	30	28
July	31.7 °C	25.5 °C	28.1 °C	36.7 °C	23.8 °C	31	26
August	31.4 °C	25.3 °C	27.8 °C	36.5 °C	23.7 °C	31	26
September	30.9 °C	24.9 °C	27.3 °C	36.2 °C	22.3 °C	30	23
October	30.5 °C	24.0 °C	26.8 °C	34.6 °C	18.4 °C	31	22
November	31.0 °C	22.9 °C	26.7 °C	35.3 °C	16.0 °C	30	22
December	30.6 °C	21.3 °C	26.0 °C	34.7 °C	12.5 °C	30	21

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	15 mm	3	11 h/day	40 %	66 %	12 km/h
February	14 mm	3	12 h/day	35 %	68 %	14 km/h
March	40 mm	6	12 h/day	42 %	70 %	16 km/h
April	71 mm	11	12 h/day	55 %	70 %	16 km/h
May	135 mm	20	13 h/day	80 %	76 %	15 km/h
June	131 mm	22	13 h/day	88 %	77 %	16 km/h
July	138 mm	22	13 h/day	89 %	78 %	16 km/h
August	147 mm	24	13 h/day	91 %	79 %	16 km/h
September	241 mm	26	12 h/day	88 %	82 %	13 km/h
October	194 mm	21	12 h/day	74 %	82 %	11 km/h
November	41 mm	6	11 h/day	54 %	71 %	12 km/h
December	9 mm	2	11 h/day	47 %	62 %	13 km/h

Planning a trip? See the best time to visit Bangkok.

QuestionsCommon questions about Bangkok’s climate

When is the best time to visit Bangkok?

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

How hot does Bangkok get?

In April, the warmest month, daily highs average 35 °C. About 306 days a year pass 30 °C. The highest value in the 1991–2020 record is 39 °C.

How cold does it get in winter?

Nights average 21 °C in December, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Bangkok?

September, averaging 241 mm over 26 days with rain. The driest month is December with 9 mm. The year as a whole averages 1,176 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 Bangkok 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
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.