Phnom Penh climate — normals and trends

Q: What is the climate of Phnom Penh?

Phnom Penh has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.9 °C and it receives 1,368 mm of precipitation per year.

Q: What is the hottest day ever recorded in Phnom Penh?

The hottest day measured in Phnom Penh between 1940 and 2025 was 25 March 2010, reaching 40.4 °C.

Q: What is the coldest day in Phnom Penh?

The coldest day measured in Phnom Penh between 1940 and 2025 was 12 January 1955, at 15.0 °C.

Q: Does it snow in Phnom Penh?

Almost never: Phnom Penh sees virtually no snow, with about 0 frost days per year.

Q: Has the climate of Phnom Penh warmed?

Yes: Phnom Penh warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Phnom Penh?

The wettest day measured in Phnom Penh between 1940 and 2025 was 28 September 2012, with 116 mm of rain in 24 hours.

Q: What was the windiest day in Phnom Penh?

The windiest day measured in Phnom Penh between 1940 and 2025 was 15 August 1974, with winds reaching 31.8 km/h.

Q: What is the warmest month in Phnom Penh?

The warmest month in Phnom Penh is April (29.8 °C on average); the coldest is December (26.1 °C).

Q: How much does it rain in Phnom Penh?

Phnom Penh receives on average 1,368 mm of precipitation per year, spread over about 197 rainy days.

Q: Is it sunny in Phnom Penh?

Phnom Penh gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.

Phnom Penh (Cambodia) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.9 °C and it receives 1,368 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is April (29.8 °C on average) and the coldest is December (26.1 °C). Rainfall peaks in September.

Phnom Penh averages 0 frost days, 321 hot days (≥ 30 °C) and 197 rainy days per year.

Phnom Penh has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.

The hottest day of the period reached 40.4 °C (on 25 March 2010) and the coldest 15.0 °C (on 12 January 1955).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

Phnom PenhPhnom Penh

coords: 11.56°, 104.92°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthAprilColdest monthDecemberWettest monthSeptemberDriest monthJanuary

Mean daily temperature

27.9°C

Average daily high

32.5°C

Average daily low

24.6°C

Annual rainfall

1,368mm

Sunshine / day

10.2h

Mean relative humidity

75%

Average peak wind

13.1km/h

Seasonal range

3.7°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

321 d/yr

Rainy days (≥ 1 mm)

197 d/yr

Annual snowfall

0.0 cm

Average feels-like high

37.4 °C

Average feels-like low

28.7 °C

Average peak gust

30.8 km/h

Tropical nights (≥ 20 °C)

357 d/yr

Solar radiation

19.1 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.1 °C

since 1940

+0.3 °C per decade · r² = 0.75 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

40.4 °C

25 March 2010

Coldest day

15.0 °C

12 January 1955

Wettest day

116 mm

28 September 2012

Windiest day

31.8 km/h

15 August 1974

Strongest gust

74.9 km/h

2 November 1997

Hottest feels-like

47.2 °C

18 May 2010

Coldest feels-like

11.2 °C

12 January 1955

Sunniest day

12.1 h

13 July 1951

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	37.4 °C9 May 2025	19.2 °C13 January 2025	28.4 °C	1,381 mm	337
2024	39.5 °C27 April 2024	21.1 °C23 December 2024	29.3 °C	1,565 mm	341
2023	39.6 °C6 May 2023	20.4 °C30 January 2023	28.8 °C	1,525 mm	343
2022	37.5 °C27 April 2022	20.4 °C25 December 2022	28.3 °C	1,740 mm	341
2021	38.5 °C2 April 2021	18.5 °C13 January 2021	28.3 °C	1,467 mm	333
2020	39.0 °C9 May 2020	20.2 °C3 February 2020	28.7 °C	1,312 mm	332
2019	39.9 °C1 May 2019	19.7 °C7 December 2019	29.1 °C	1,118 mm	339
2018	39.1 °C26 April 2018	19.9 °C7 February 2018	28.6 °C	1,375 mm	355
2017	37.9 °C23 April 2017	19.3 °C19 December 2017	28.5 °C	1,629 mm	344
2016	40.2 °C5 May 2016	18.9 °C8 February 2016	29.2 °C	1,554 mm	337
2015	40.3 °C18 May 2015	19.7 °C8 February 2015	29.3 °C	1,024 mm	360
2014	39.7 °C30 May 2014	16.2 °C24 January 2014	28.7 °C	1,153 mm	347
2013	40.2 °C6 April 2013	18.6 °C28 December 2013	28.7 °C	1,468 mm	327
2012	39.1 °C7 March 2012	22.6 °C25 December 2012	29.0 °C	1,539 mm	356
2011	39.5 °C18 April 2011	19.8 °C20 January 2011	28.5 °C	1,313 mm	346
2010	40.4 °C25 March 2010	21.0 °C31 October 2010	29.0 °C	1,495 mm	347
2009	37.4 °C20 April 2009	18.1 °C11 January 2009	28.1 °C	1,460 mm	336
2008	37.0 °C30 March 2008	20.8 °C2 January 2008	28.0 °C	1,583 mm	331
2007	38.0 °C2 April 2007	18.7 °C30 January 2007	28.2 °C	1,696 mm	322
2006	37.7 °C21 April 2006	19.7 °C23 December 2006	28.5 °C	1,294 mm	348
2005	39.4 °C6 May 2005	18.4 °C4 January 2005	28.6 °C	1,273 mm	332
2004	38.7 °C26 March 2004	19.3 °C20 December 2004	28.7 °C	1,067 mm	354
2003	39.3 °C10 April 2003	20.3 °C21 December 2003	28.9 °C	1,449 mm	349
2002	39.3 °C23 April 2002	19.9 °C2 January 2002	29.2 °C	1,055 mm	350
2001	38.4 °C10 May 2001	19.0 °C31 December 2001	28.3 °C	1,407 mm	333
2000	36.8 °C28 March 2000	20.7 °C2 February 2000	28.0 °C	1,498 mm	333
1999	37.1 °C18 March 1999	15.5 °C25 December 1999	27.5 °C	1,721 mm	306
1998	39.5 °C24 May 1998	17.7 °C16 December 1998	28.9 °C	1,570 mm	333
1997	38.0 °C18 June 1997	18.6 °C4 January 1997	28.3 °C	1,153 mm	344
1996	38.6 °C1 April 1996	18.0 °C28 December 1996	28.0 °C	1,602 mm	322
1995	37.9 °C25 April 1995	17.8 °C7 January 1995	28.3 °C	1,322 mm	341
1994	37.6 °C4 May 1994	19.2 °C26 January 1994	27.9 °C	1,189 mm	338
1993	39.5 °C8 May 1993	17.8 °C29 January 1993	27.7 °C	1,497 mm	310
1992	38.9 °C30 May 1992	17.6 °C19 January 1992	28.2 °C	1,140 mm	337
1991	38.8 °C20 April 1991	21.1 °C20 December 1991	28.2 °C	1,263 mm	340
1990	38.6 °C20 April 1990	19.5 °C6 December 1990	28.6 °C	1,158 mm	345
1989	37.7 °C23 April 1989	19.0 °C3 December 1989	27.8 °C	1,383 mm	340
1988	38.4 °C15 March 1988	18.9 °C15 December 1988	28.1 °C	1,496 mm	316
1987	39.6 °C11 April 1987	18.2 °C8 December 1987	28.4 °C	1,593 mm	326
1986	37.6 °C9 April 1986	17.8 °C4 March 1986	27.8 °C	1,420 mm	315
1985	39.6 °C13 April 1985	18.4 °C17 December 1985	27.8 °C	1,473 mm	332
1984	37.9 °C28 March 1984	19.3 °C6 January 1984	27.7 °C	1,302 mm	337
1983	38.4 °C13 April 1983	17.4 °C25 January 1983	28.0 °C	1,443 mm	308
1982	36.7 °C15 March 1982	17.3 °C29 December 1982	27.4 °C	1,488 mm	334
1981	38.4 °C30 March 1981	18.1 °C14 January 1981	27.9 °C	1,431 mm	317
1980	38.7 °C4 April 1980	18.8 °C25 December 1980	28.0 °C	1,610 mm	336
1979	38.7 °C13 March 1979	19.6 °C27 December 1979	28.2 °C	1,189 mm	340
1978	39.3 °C3 April 1978	19.4 °C23 January 1978	28.0 °C	1,452 mm	327
1977	37.6 °C7 June 1977	19.3 °C6 March 1977	28.0 °C	1,250 mm	344
1976	37.3 °C20 April 1976	15.2 °C17 January 1976	27.3 °C	1,435 mm	312
1975	37.5 °C19 March 1975	15.5 °C30 December 1975	27.2 °C	1,635 mm	311
1974	35.8 °C11 April 1974	17.5 °C11 January 1974	27.4 °C	1,428 mm	305
1973	37.9 °C18 April 1973	17.4 °C29 December 1973	27.8 °C	1,383 mm	312
1972	39.4 °C27 May 1972	17.5 °C23 January 1972	27.7 °C	1,859 mm	327
1971	36.4 °C25 April 1971	17.6 °C17 November 1971	27.0 °C	1,514 mm	282
1970	37.8 °C2 June 1970	18.2 °C22 January 1970	27.8 °C	1,260 mm	322
1969	37.5 °C21 May 1969	19.0 °C7 February 1969	27.9 °C	1,178 mm	310
1968	37.2 °C29 March 1968	18.3 °C12 January 1968	27.7 °C	1,036 mm	343
1967	37.0 °C10 April 1967	15.9 °C17 January 1967	27.3 °C	947 mm	319
1966	37.2 °C13 March 1966	19.6 °C2 January 1966	27.5 °C	1,331 mm	308
1965	38.5 °C2 May 1965	16.2 °C18 January 1965	27.5 °C	1,224 mm	325
1964	38.2 °C13 April 1964	18.0 °C19 December 1964	27.6 °C	1,426 mm	299
1963	38.6 °C18 May 1963	15.1 °C16 January 1963	27.4 °C	1,169 mm	318
1962	36.8 °C13 May 1962	15.8 °C28 January 1962	27.3 °C	1,356 mm	311
1961	37.9 °C26 March 1961	16.4 °C19 January 1961	27.5 °C	1,135 mm	320
1960	38.0 °C23 March 1960	17.4 °C4 January 1960	27.9 °C	1,268 mm	318
1959	36.5 °C25 April 1959	17.9 °C18 January 1959	27.7 °C	1,219 mm	331
1958	37.7 °C25 April 1958	18.2 °C15 February 1958	27.6 °C	1,109 mm	305
1957	37.2 °C16 May 1957	17.6 °C21 January 1957	27.4 °C	1,539 mm	315
1956	36.0 °C25 March 1956	16.4 °C30 December 1956	26.7 °C	1,672 mm	285
1955	37.4 °C18 April 1955	15.0 °C12 January 1955	27.1 °C	1,484 mm	293
1954	36.8 °C18 April 1954	18.2 °C16 December 1954	27.3 °C	1,113 mm	312
1953	34.8 °C28 March 1953	17.8 °C9 January 1953	27.2 °C	1,432 mm	310
1952	37.2 °C9 April 1952	16.6 °C23 January 1952	27.5 °C	1,138 mm	305
1951	37.3 °C11 April 1951	17.3 °C2 January 1951	27.6 °C	907 mm	320
1950	37.4 °C22 April 1950	19.1 °C15 December 1950	27.3 °C	1,146 mm	288
1949	36.7 °C3 June 1949	17.6 °C10 January 1949	27.3 °C	1,411 mm	305
1948	36.8 °C13 March 1948	18.4 °C2 January 1948	27.2 °C	1,124 mm	303
1947	37.1 °C24 April 1947	19.8 °C24 December 1947	27.3 °C	1,186 mm	333
1946	35.3 °C26 March 1946	18.2 °C7 January 1946	26.8 °C	1,294 mm	303
1945	34.6 °C26 March 1945	18.6 °C29 December 1945	26.4 °C	1,548 mm	247
1944	37.1 °C8 April 1944	17.6 °C21 December 1944	27.1 °C	1,376 mm	272
1943	36.0 °C25 March 1943	16.9 °C25 January 1943	26.1 °C	1,489 mm	232
1942	35.0 °C24 April 1942	17.2 °C23 November 1942	26.6 °C	1,414 mm	279
1941	35.7 °C10 March 1941	19.3 °C26 December 1941	26.8 °C	1,459 mm	274
1940	35.5 °C10 March 1940	15.5 °C4 January 1940	26.3 °C	1,433 mm	225

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

32.7 °C

+0.2 °C

Hot days (≥ 30 °C)

337 d/yr

+16

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1381 mm

+13 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	30.9 °C	-0.6 °C	1 mm	-12 mm
Feb	33.3 °C	+0.3 °C	13 mm	-1 mm
Mar	34.5 °C	-0.1 °C	35 mm	+1 mm
Apr	35.0 °C	0.0 °C	94 mm	+14 mm
May	33.8 °C	-0.1 °C	222 mm	+73 mm
Jun	32.8 °C	-0.1 °C	203 mm	+56 mm
Jul	32.8 °C	+0.5 °C	119 mm	-41 mm
Aug	33.6 °C	+1.3 °C	127 mm	-45 mm
Sep	32.2 °C	+0.5 °C	266 mm	+19 mm
Oct	32.0 °C	+0.8 °C	156 mm	-76 mm
Nov	30.5 °C	-0.3 °C	120 mm	+23 mm
Dec	31.3 °C	+0.8 °C	26 mm	+1 mm

The year's extremes

Hottest day

37.4 °C

9 May 2025

Coldest day

19.2 °C

13 Jan 2025

Wettest day

40.8 mm

22 Jun 2025

Windiest day

26.0 km/h

12 Jan 2025

Strongest gust

59.0 km/h

19 Jul 2025

Hottest feels-like

44.5 °C

21 May 2025

Coldest feels-like

17.6 °C

13 Jan 2025

Sunniest day

12.0 h

28 Mar 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Phnom Penh?

Phnom Penh has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.9 °C and it receives 1,368 mm of precipitation per year.

What is the hottest day ever recorded in Phnom Penh?

The hottest day measured in Phnom Penh between 1940 and 2025 was 25 March 2010, reaching 40.4 °C.

What is the coldest day in Phnom Penh?

The coldest day measured in Phnom Penh between 1940 and 2025 was 12 January 1955, at 15.0 °C.

Does it snow in Phnom Penh?

Almost never: Phnom Penh sees virtually no snow, with about 0 frost days per year.

Has the climate of Phnom Penh warmed?

Yes: Phnom Penh warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Phnom Penh?

The wettest day measured in Phnom Penh between 1940 and 2025 was 28 September 2012, with 116 mm of rain in 24 hours.

What was the windiest day in Phnom Penh?

The windiest day measured in Phnom Penh between 1940 and 2025 was 15 August 1974, with winds reaching 31.8 km/h.

What is the warmest month in Phnom Penh?

The warmest month in Phnom Penh is April (29.8 °C on average); the coldest is December (26.1 °C).

How much does it rain in Phnom Penh?

Phnom Penh receives on average 1,368 mm of precipitation per year, spread over about 197 rainy days.

Is it sunny in Phnom Penh?

Phnom Penh gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.

Are there tropical nights in Phnom Penh?

Yes: Phnom Penh has on average 357 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Phnom Penh?

In Phnom Penh, between 1940 and 2025, the highest apparent temperature reached 47.2 °C on 18 May 2010, and the lowest was 11.2 °C on 12 January 1955.

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