Samut Prakan climate

Name: Samut Prakan
Address: TH

Samut Prakan is warmest in April, with average highs of 33 °C, and coldest in December, when nights average 22 °C. September is the wettest month (226 mm) and December the driest (10 mm). Figures are 1991–2020 climate normals.

Across a full year Samut Prakan averages 1,132 mm of rain and 364 days above 25 °C.

Thailand · population 388,920 · 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 33 °C
Coldest month December 22 °C
Driest month December 10 mm
Wettest month September 226 mm
Least cloud February 36 % cloud
Hottest on record May 38 °C
Coldest on record December 13 °C
Warmest sea May 31 °C

What to expectSamut Prakan through the year

Samut Prakan has a clear annual cycle: average daily highs run from 30 °C in December to 33 °C in April, a swing of 3.7 °C in mean temperature across the year.

Counted across a normal year, 364 days a year reach 25 °C, 283 of them reach 30 °C. The warmest reading in the 1991–2020 record is 38 °C, in May.

Rain is strongly seasonal. September averages 226 mm against 10 mm in December — 22 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Samut Prakan is warmest in May at 31 °C and coldest in January at 27 °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	30.5 °C	18 mm	41 %
February	31.5 °C	16 mm	36 %
March	32.4 °C	43 mm	43 %
April	33.4 °C	76 mm	56 %
May	32.5 °C	129 mm	80 %
June	31.7 °C	116 mm	87 %
July	31.1 °C	125 mm	89 %
August	30.8 °C	131 mm	90 %
September	30.4 °C	226 mm	88 %
October	30.1 °C	197 mm	75 %
November	30.6 °C	44 mm	54 %
December	30.3 °C	10 mm	48 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	30.5 °C	22.3 °C	26.4 °C	34.7 °C	14.6 °C	31	21
February	31.5 °C	24.0 °C	27.6 °C	35.1 °C	15.5 °C	28	25
March	32.4 °C	25.8 °C	28.7 °C	36.0 °C	17.6 °C	31	29
April	33.4 °C	27.1 °C	29.8 °C	37.0 °C	21.0 °C	30	29
May	32.5 °C	27.0 °C	29.4 °C	38.0 °C	24.0 °C	31	28
June	31.7 °C	26.6 °C	28.8 °C	36.4 °C	24.5 °C	30	27
July	31.1 °C	26.2 °C	28.3 °C	35.8 °C	24.3 °C	31	24
August	30.8 °C	25.9 °C	28.0 °C	35.5 °C	24.2 °C	31	22
September	30.4 °C	25.4 °C	27.5 °C	35.0 °C	23.4 °C	30	19
October	30.1 °C	24.4 °C	27.0 °C	33.8 °C	18.9 °C	31	19
November	30.6 °C	23.4 °C	26.8 °C	34.6 °C	17.3 °C	30	21
December	30.3 °C	21.9 °C	26.1 °C	34.8 °C	12.9 °C	31	20

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	18 mm	3	11 h/day	41 %	67 %	14 km/h	27.4 °C
February	16 mm	4	12 h/day	36 %	70 %	17 km/h	28.0 °C
March	43 mm	8	12 h/day	43 %	72 %	18 km/h	29.0 °C
April	76 mm	11	12 h/day	56 %	72 %	17 km/h	30.2 °C
May	129 mm	19	13 h/day	80 %	76 %	17 km/h	30.7 °C
June	116 mm	20	13 h/day	87 %	76 %	18 km/h	30.2 °C
July	125 mm	21	13 h/day	89 %	77 %	18 km/h	29.7 °C
August	131 mm	22	13 h/day	90 %	78 %	18 km/h	29.5 °C
September	226 mm	24	12 h/day	88 %	82 %	15 km/h	29.4 °C
October	197 mm	21	12 h/day	75 %	82 %	12 km/h	29.4 °C
November	44 mm	6	12 h/day	54 %	72 %	14 km/h	28.8 °C
December	10 mm	2	11 h/day	48 %	63 %	15 km/h	27.7 °C

Where Samut Prakan ranks

Ranking	Position	Value
Warmest sea temperatures in Asia in May	3rd of 50	31 °C
Warmest sea temperatures in the world in May	4th of 50	31 °C
Warmest sea temperatures in Asia in April	10th of 50	30 °C
Warmest sea temperatures in the world in April	10th of 50	30 °C
Best beach destinations in Asia in December	38th of 50	94/100
Warmest sea temperatures in Asia in June	41st of 50	30 °C

Planning a trip? See the best time to visit Samut Prakan.

QuestionsCommon questions about Samut Prakan’s climate

When is the best time to visit Samut Prakan?

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 Samut Prakan get?

In April, the warmest month, daily highs average 33 °C. About 283 days a year pass 30 °C. The highest value in the 1991–2020 record is 38 °C.

How cold does it get in winter?

Nights average 22 °C in December, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Samut Prakan?

September, averaging 226 mm over 24 days with rain. The driest month is December with 10 mm. The year as a whole averages 1,132 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 Samut Prakan 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: 13.598°, 100.597° (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.