Phnom Penh climate

Name: Phnom Penh
Address: KH

Phnom Penh is warmest in April, with average highs of 35 °C, and coldest in January, when nights average 22 °C. September is the wettest month (248 mm) and February the driest (8.0 mm). Figures are 1991–2020 climate normals.

Across a full year Phnom Penh averages 1,393 mm of rain and 364 days above 25 °C.

Cambodia · population 1,573,544 · 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 January 22 °C
Driest month February 8 mm
Wettest month September 248 mm
Least cloud February 46 % cloud
Hottest on record April 39 °C
Coldest on record December 15 °C

What to expectPhnom Penh through the year

Phnom Penh has a clear annual cycle: average daily highs run from 32 °C in January to 35 °C in April, a swing of 3.4 °C in mean temperature across the year.

Counted across a normal year, 364 days a year reach 25 °C, 309 of them reach 30 °C. The warmest reading in the 1991–2020 record is 39 °C, in April.

Rain is strongly seasonal. September averages 248 mm against 8 mm in February — 31 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	31.7 °C	15 mm	54 %
February	33.3 °C	8 mm	46 %
March	34.6 °C	39 mm	50 %
April	34.7 °C	88 mm	61 %
May	33.6 °C	154 mm	80 %
June	32.4 °C	156 mm	85 %
July	31.8 °C	156 mm	86 %
August	31.7 °C	179 mm	88 %
September	31.0 °C	248 mm	89 %
October	30.3 °C	247 mm	81 %
November	30.3 °C	77 mm	65 %
December	30.5 °C	27 mm	63 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	31.7 °C	22.4 °C	26.9 °C	35.7 °C	15.3 °C	31	27
February	33.3 °C	23.4 °C	28.3 °C	37.2 °C	18.7 °C	28	28
March	34.6 °C	25.1 °C	29.5 °C	38.6 °C	20.3 °C	31	31
April	34.7 °C	25.9 °C	29.7 °C	39.2 °C	23.1 °C	30	30
May	33.6 °C	25.9 °C	29.0 °C	39.1 °C	23.9 °C	31	30
June	32.4 °C	25.4 °C	28.2 °C	37.7 °C	22.3 °C	30	27
July	31.8 °C	25.0 °C	27.7 °C	37.3 °C	23.2 °C	31	27
August	31.7 °C	24.9 °C	27.6 °C	36.8 °C	22.7 °C	31	26
September	31.0 °C	24.5 °C	27.0 °C	35.1 °C	22.6 °C	30	23
October	30.3 °C	24.1 °C	26.6 °C	32.9 °C	19.7 °C	31	21
November	30.3 °C	23.5 °C	26.6 °C	34.1 °C	17.0 °C	30	19
December	30.5 °C	22.6 °C	26.3 °C	34.7 °C	15.0 °C	30	21

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	15 mm	3	12 h/day	54 %	63 %	13 km/h
February	8 mm	2	12 h/day	46 %	60 %	13 km/h
March	39 mm	6	12 h/day	50 %	62 %	13 km/h
April	88 mm	14	12 h/day	61 %	69 %	12 km/h
May	154 mm	23	13 h/day	80 %	76 %	13 km/h
June	156 mm	24	13 h/day	85 %	79 %	14 km/h
July	156 mm	25	13 h/day	86 %	79 %	15 km/h
August	179 mm	25	13 h/day	88 %	80 %	15 km/h
September	248 mm	27	12 h/day	89 %	83 %	13 km/h
October	247 mm	25	12 h/day	81 %	84 %	11 km/h
November	77 mm	11	12 h/day	65 %	78 %	14 km/h
December	27 mm	5	11 h/day	63 %	68 %	15 km/h

How Phnom Penh 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
Phnom Penh	35 °C	22 °C	1,393 mm	364
Takeo · Cambodia	34 °C	22 °C	1,411 mm	365
Tân Châu · Vietnam	34 °C	22 °C	1,657 mm	365
Long Xuyên · Vietnam	34 °C	22 °C	1,732 mm	365
Cao Lãnh · Vietnam	34 °C	22 °C	1,814 mm	365
Thốt Nốt · Vietnam	34 °C	22 °C	1,820 mm	364
Trảng Bàng · Vietnam	34 °C	22 °C	1,883 mm	365

Where Phnom Penh ranks

Ranking	Position	Value
The warmest places in Asia in January	4thof 50	32 °C
The warmest places in Asia in February	17thof 50	33 °C
The warmest places in Asia in December	20thof 50	31 °C

Planning a trip? See the best time to visit Phnom Penh.

QuestionsCommon questions about Phnom Penh’s climate

When is the best time to visit Phnom Penh?

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, April is the warmest month and February the driest. The month-by-month table above has the full picture.

How hot does Phnom Penh get?

In April, the warmest month, daily highs average 35 °C. About 309 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 22 °C in January, the coldest month. Freezing nights are not part of a normal year here.

Which month is wettest in Phnom Penh?

September, averaging 248 mm over 27 days with rain. The driest month is February with 8 mm. The year as a whole averages 1,393 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 Phnom Penh 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.