Sai Mai climate

Name: Sai Mai
Address: TH

Sai Mai is warmest in April, with average highs of 35 °C, and coldest in December, when nights average 21 °C. September is the wettest month (283 mm) and December the driest (8.5 mm). Figures are 1991–2020 climate normals.

Across a full year Sai Mai averages 1,447 mm of rain and 364 days above 25 °C.

Thailand · population 188,123 · 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 8 mm
Wettest month September 283 mm
Least cloud February 39 % cloud
Hottest on record April 40 °C
Coldest on record December 12 °C

What to expectSai Mai through the year

Sai Mai 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, 313 of them reach 30 °C. The warmest reading in the 1991–2020 record is 40 °C, in April.

Rain is strongly seasonal. September averages 283 mm against 8 mm in December — 33 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	31.2 °C	16 mm	42 %
February	32.6 °C	18 mm	39 %
March	34.0 °C	56 mm	45 %
April	34.8 °C	93 mm	58 %
May	33.5 °C	186 mm	80 %
June	32.4 °C	181 mm	88 %
July	31.8 °C	186 mm	89 %
August	31.5 °C	206 mm	91 %
September	31.1 °C	283 mm	88 %
October	30.6 °C	178 mm	72 %
November	31.0 °C	35 mm	53 %
December	30.7 °C	8 mm	46 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	31.2 °C	21.1 °C	26.1 °C	35.1 °C	13.0 °C	31	24
February	32.6 °C	22.7 °C	27.4 °C	36.7 °C	14.8 °C	28	26
March	34.0 °C	24.8 °C	28.9 °C	39.1 °C	17.1 °C	31	30
April	34.8 °C	26.2 °C	29.9 °C	39.5 °C	21.1 °C	30	29
May	33.5 °C	26.2 °C	29.2 °C	39.3 °C	23.0 °C	31	29
June	32.4 °C	25.8 °C	28.5 °C	38.2 °C	23.7 °C	30	28
July	31.8 °C	25.4 °C	28.0 °C	37.0 °C	23.6 °C	31	27
August	31.5 °C	25.1 °C	27.7 °C	36.1 °C	23.4 °C	31	26
September	31.1 °C	24.6 °C	27.2 °C	35.6 °C	21.5 °C	30	24
October	30.6 °C	23.8 °C	26.8 °C	34.2 °C	17.7 °C	31	23
November	31.0 °C	22.6 °C	26.6 °C	35.2 °C	15.4 °C	30	23
December	30.7 °C	21.0 °C	25.8 °C	34.5 °C	12.3 °C	31	22

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	16 mm	3	11 h/day	42 %	66 %	9.8 km/h
February	18 mm	4	12 h/day	39 %	69 %	12 km/h
March	56 mm	8	12 h/day	45 %	71 %	13 km/h
April	93 mm	14	12 h/day	58 %	71 %	13 km/h
May	186 mm	23	13 h/day	80 %	76 %	13 km/h
June	181 mm	25	13 h/day	88 %	78 %	14 km/h
July	186 mm	25	13 h/day	89 %	78 %	14 km/h
August	206 mm	26	13 h/day	91 %	80 %	14 km/h
September	283 mm	27	12 h/day	88 %	83 %	11 km/h
October	178 mm	20	12 h/day	72 %	82 %	9.7 km/h
November	35 mm	6	11 h/day	53 %	71 %	11 km/h
December	8 mm	2	11 h/day	46 %	62 %	11 km/h

How Sai Mai 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
Sai Mai	35 °C	21 °C	1,447 mm	364
Khlong Sam Wa · Thailand	35 °C	21 °C	1,308 mm	364
Pak Kret · Thailand	35 °C	21 °C	1,282 mm	364
Bangkok · Thailand	35 °C	21 °C	1,176 mm	364

Where Sai Mai ranks

Ranking	Position	Value
The warmest places in Asia in December	13th of 50	31 °C
The warmest places in Asia in January	19th of 50	31 °C
The warmest places in Asia in November	34th of 50	31 °C
The warmest places in Asia in February	37th of 50	33 °C

Planning a trip? See the best time to visit Sai Mai.

QuestionsCommon questions about Sai Mai’s climate

When is the best time to visit Sai Mai?

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 Sai Mai get?

In April, the warmest month, daily highs average 35 °C. About 313 days a year pass 30 °C. The highest value in the 1991–2020 record is 40 °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 Sai Mai?

September, averaging 283 mm over 27 days with rain. The driest month is December with 8 mm. The year as a whole averages 1,447 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 Sai Mai 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: 13.921°, 100.646° (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.