Siem Reap climate — normals and trends

Q: What is the climate of Siem Reap?

Siem Reap has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.9 °C and it receives 1,350 mm of precipitation per year.

Q: What is the hottest day ever recorded in Siem Reap?

The hottest day measured in Siem Reap between 1940 and 2025 was 28 April 2016, reaching 40.1 °C.

Q: What is the coldest day in Siem Reap?

The coldest day measured in Siem Reap between 1940 and 2025 was 12 January 1955, at 12.4 °C.

Q: Does it snow in Siem Reap?

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

Q: Has the climate of Siem Reap warmed?

Yes: Siem Reap warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Siem Reap?

The wettest day measured in Siem Reap between 1940 and 2025 was 4 October 1990, with 167 mm of rain in 24 hours.

Q: What was the windiest day in Siem Reap?

The windiest day measured in Siem Reap between 1940 and 2025 was 12 November 1973, with winds reaching 34.7 km/h.

Q: What is the warmest month in Siem Reap?

The warmest month in Siem Reap is April (29.8 °C on average); the coldest is December (25.4 °C).

Q: How much does it rain in Siem Reap?

Siem Reap receives on average 1,350 mm of precipitation per year, spread over about 184 rainy days.

Q: Is it sunny in Siem Reap?

Siem Reap gets on average 10.3 hours of sunshine per day, roughly 3,760 hours per year over 1940-2025.

Siem Reap (Cambodia) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 27.9 °C and it receives 1,350 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 (25.4 °C). Rainfall peaks in September.

Siem Reap averages 0 frost days, 286 hot days (≥ 30 °C) and 184 rainy days per year.

Siem Reap has warmed by +1.9 °C between 1940 and 2025, or +0.22 °C per decade. This trend is statistically significant.

The hottest day of the period reached 40.1 °C (on 28 April 2016) and the coldest 12.4 °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

Siem ReapSiem Reap

coords: 13.36°, 103.86°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthAprilColdest monthDecemberWettest monthSeptemberDriest monthJanuary

Mean daily temperature

27.9°C

Average daily high

31.6°C

Average daily low

24.9°C

Annual rainfall

1,350mm

Sunshine / day

10.3h

Mean relative humidity

75%

Average peak wind

13.2km/h

Seasonal range

4.4°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

286 d/yr

Rainy days (≥ 1 mm)

184 d/yr

Annual snowfall

0.0 cm

Average feels-like high

36.8 °C

Average feels-like low

28.9 °C

Average peak gust

28.1 km/h

Tropical nights (≥ 20 °C)

350 d/yr

Solar radiation

19.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.9 °C

since 1940

+0.2 °C per decade · r² = 0.72 · 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

40.1 °C

28 April 2016

Coldest day

12.4 °C

12 January 1955

Wettest day

167 mm

4 October 1990

Windiest day

34.7 km/h

12 November 1973

Strongest gust

68.8 km/h

4 October 1990

Hottest feels-like

46.9 °C

18 May 2010

Coldest feels-like

9.6 °C

12 January 1955

Sunniest day

12.4 h

21 July 1953

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	36.3 °C5 March 2025	16.2 °C13 January 2025	28.0 °C	1,660 mm	297
2024	39.8 °C29 April 2024	18.2 °C23 December 2024	29.3 °C	1,198 mm	341
2023	38.9 °C7 May 2023	17.5 °C30 January 2023	28.7 °C	1,559 mm	323
2022	37.7 °C27 April 2022	17.1 °C19 December 2022	28.2 °C	1,628 mm	311
2021	38.1 °C4 July 2021	15.1 °C13 January 2021	28.4 °C	1,242 mm	303
2020	38.0 °C10 May 2020	17.6 °C22 December 2020	28.8 °C	1,181 mm	315
2019	39.2 °C4 May 2019	17.5 °C7 December 2019	29.1 °C	1,027 mm	332
2018	37.0 °C23 April 2018	17.3 °C6 February 2018	28.6 °C	1,217 mm	338
2017	37.5 °C23 April 2017	16.2 °C19 December 2017	28.4 °C	1,374 mm	324
2016	40.1 °C28 April 2016	15.9 °C8 February 2016	29.1 °C	1,379 mm	329
2015	39.2 °C20 April 2015	17.5 °C16 January 2015	29.3 °C	878 mm	344
2014	38.0 °C30 May 2014	15.4 °C24 January 2014	28.6 °C	1,040 mm	322
2013	39.6 °C6 April 2013	16.4 °C28 December 2013	28.4 °C	1,556 mm	308
2012	39.3 °C26 April 2012	20.8 °C25 December 2012	29.0 °C	1,258 mm	346
2011	37.8 °C18 April 2011	17.5 °C12 December 2011	28.0 °C	1,393 mm	315
2010	39.6 °C18 May 2010	19.0 °C18 December 2010	29.0 °C	1,269 mm	331
2009	37.6 °C23 April 2009	15.5 °C11 January 2009	28.1 °C	1,352 mm	317
2008	37.4 °C17 April 2008	18.4 °C2 January 2008	28.1 °C	1,498 mm	301
2007	37.4 °C18 April 2007	17.9 °C28 November 2007	28.3 °C	1,352 mm	310
2006	36.6 °C23 April 2006	17.7 °C23 December 2006	28.5 °C	1,223 mm	320
2005	38.7 °C6 May 2005	17.2 °C2 January 2005	28.4 °C	1,215 mm	312
2004	38.7 °C17 April 2004	18.5 °C25 January 2004	28.5 °C	1,024 mm	337
2003	38.7 °C14 April 2003	17.4 °C21 December 2003	28.5 °C	1,231 mm	324
2002	36.5 °C7 April 2002	19.5 °C4 January 2002	28.6 °C	1,413 mm	324
2001	37.6 °C9 May 2001	17.3 °C23 December 2001	28.3 °C	1,273 mm	318
2000	35.9 °C28 March 2000	17.9 °C2 February 2000	27.9 °C	1,712 mm	305
1999	36.9 °C21 March 1999	13.1 °C25 December 1999	27.4 °C	1,850 mm	272
1998	38.9 °C24 May 1998	17.5 °C16 December 1998	29.1 °C	1,113 mm	316
1997	36.3 °C19 June 1997	17.6 °C14 January 1997	28.3 °C	1,095 mm	321
1996	37.9 °C19 March 1996	17.1 °C1 January 1996	27.9 °C	1,602 mm	293
1995	37.1 °C22 April 1995	16.7 °C31 December 1995	28.1 °C	1,256 mm	298
1994	38.1 °C5 May 1994	17.8 °C24 January 1994	28.0 °C	1,137 mm	320
1993	37.2 °C1 May 1993	15.7 °C30 January 1993	27.6 °C	1,336 mm	283
1992	38.3 °C21 April 1992	17.5 °C17 January 1992	28.0 °C	1,158 mm	281
1991	38.3 °C12 April 1991	19.4 °C29 December 1991	28.3 °C	1,255 mm	305
1990	37.8 °C20 April 1990	17.8 °C6 December 1990	28.4 °C	1,190 mm	313
1989	38.7 °C23 April 1989	18.6 °C5 December 1989	28.0 °C	1,194 mm	307
1988	37.1 °C29 March 1988	19.2 °C8 December 1988	28.0 °C	1,569 mm	271
1987	38.0 °C13 April 1987	16.5 °C8 December 1987	28.4 °C	1,159 mm	298
1986	38.2 °C31 May 1986	15.6 °C3 March 1986	27.8 °C	1,256 mm	268
1985	37.4 °C13 April 1985	16.7 °C17 December 1985	27.7 °C	1,499 mm	299
1984	37.5 °C7 April 1984	17.0 °C10 January 1984	27.9 °C	1,156 mm	310
1983	38.7 °C21 May 1983	15.2 °C24 January 1983	28.1 °C	1,487 mm	289
1982	37.0 °C2 May 1982	14.7 °C29 December 1982	27.8 °C	1,158 mm	305
1981	37.7 °C9 April 1981	16.0 °C14 January 1981	27.8 °C	1,352 mm	295
1980	38.8 °C25 April 1980	18.6 °C25 December 1980	28.1 °C	1,686 mm	308
1979	37.6 °C3 April 1979	18.4 °C27 December 1979	28.3 °C	1,256 mm	326
1978	37.9 °C1 April 1978	18.3 °C23 January 1978	27.9 °C	1,497 mm	286
1977	36.7 °C27 April 1977	18.1 °C5 March 1977	27.8 °C	1,086 mm	306
1976	36.5 °C17 April 1976	14.9 °C1 January 1976	27.2 °C	1,599 mm	268
1975	37.2 °C29 April 1975	13.1 °C30 December 1975	27.1 °C	1,610 mm	272
1974	35.7 °C12 July 1974	15.5 °C2 January 1974	27.3 °C	1,486 mm	267
1973	36.7 °C17 April 1973	15.3 °C27 December 1973	27.7 °C	1,541 mm	271
1972	37.7 °C27 May 1972	16.4 °C16 January 1972	27.6 °C	1,746 mm	283
1971	35.4 °C25 April 1971	15.3 °C5 January 1971	26.8 °C	1,412 mm	230
1970	36.1 °C12 May 1970	18.7 °C22 January 1970	27.7 °C	1,159 mm	278
1969	37.1 °C21 April 1969	17.4 °C5 December 1969	27.8 °C	1,111 mm	275
1968	36.4 °C30 March 1968	17.1 °C5 January 1968	27.7 °C	1,080 mm	310
1967	35.5 °C4 April 1967	13.1 °C17 January 1967	27.0 °C	1,096 mm	233
1966	36.2 °C29 April 1966	18.1 °C3 December 1966	27.5 °C	1,673 mm	233
1965	37.1 °C29 April 1965	16.9 °C18 January 1965	27.5 °C	1,302 mm	295
1964	36.6 °C2 April 1964	16.6 °C19 December 1964	27.5 °C	1,429 mm	279
1963	37.5 °C21 April 1963	13.5 °C16 January 1963	27.2 °C	1,371 mm	270
1962	37.4 °C21 March 1962	15.3 °C28 January 1962	27.2 °C	1,433 mm	265
1961	36.6 °C8 April 1961	15.3 °C17 January 1961	27.5 °C	1,249 mm	276
1960	37.9 °C27 April 1960	15.2 °C3 January 1960	27.8 °C	1,286 mm	281
1959	37.1 °C11 June 1959	18.1 °C3 March 1959	27.7 °C	1,172 mm	283
1958	37.7 °C25 April 1958	17.5 °C27 November 1958	27.7 °C	1,145 mm	274
1957	35.9 °C15 May 1957	17.7 °C2 January 1957	27.5 °C	1,630 mm	267
1956	35.2 °C24 March 1956	15.1 °C19 January 1956	26.8 °C	1,617 mm	233
1955	37.2 °C18 April 1955	12.4 °C12 January 1955	27.1 °C	1,658 mm	262
1954	37.0 °C16 April 1954	15.6 °C17 December 1954	27.4 °C	1,119 mm	277
1953	34.1 °C28 March 1953	16.7 °C12 December 1953	26.9 °C	1,805 mm	238
1952	34.8 °C12 April 1952	16.1 °C10 December 1952	27.2 °C	1,441 mm	252
1951	36.5 °C10 April 1951	17.3 °C2 January 1951	27.5 °C	1,051 mm	275
1950	36.5 °C23 April 1950	18.3 °C10 December 1950	27.4 °C	1,214 mm	257
1949	36.4 °C15 June 1949	15.5 °C16 January 1949	27.4 °C	1,177 mm	261
1948	34.5 °C23 July 1948	15.9 °C2 January 1948	27.1 °C	1,212 mm	242
1947	35.5 °C19 June 1947	17.2 °C21 December 1947	27.6 °C	1,307 mm	277
1946	34.9 °C5 April 1946	16.3 °C8 January 1946	27.1 °C	1,330 mm	251
1945	33.4 °C26 March 1945	16.7 °C18 January 1945	26.6 °C	1,781 mm	177
1944	36.7 °C24 June 1944	14.9 °C21 December 1944	27.2 °C	1,364 mm	228
1943	34.5 °C25 March 1943	16.3 °C13 January 1943	26.3 °C	1,545 mm	165
1942	34.0 °C26 July 1942	17.7 °C15 December 1942	26.8 °C	1,416 mm	214
1941	34.5 °C12 March 1941	18.3 °C25 December 1941	27.1 °C	1,575 mm	203
1940	34.9 °C11 March 1940	15.6 °C4 January 1940	26.6 °C	1,463 mm	188

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

31.7 °C

+0.1 °C

Hot days (≥ 30 °C)

297 d/yr

+11

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1660 mm

+310 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	29.7 °C	-0.6 °C	0 mm	-10 mm
Feb	32.9 °C	+1.0 °C	8 mm	-14 mm
Mar	33.2 °C	-0.1 °C	65 mm	+9 mm
Apr	33.8 °C	0.0 °C	113 mm	+12 mm
May	32.5 °C	-0.5 °C	257 mm	+107 mm
Jun	32.2 °C	-0.3 °C	164 mm	+37 mm
Jul	32.0 °C	0.0 °C	145 mm	+7 mm
Aug	32.3 °C	+0.5 °C	144 mm	-14 mm
Sep	30.8 °C	-0.1 °C	375 mm	+117 mm
Oct	31.3 °C	+0.8 °C	230 mm	-4 mm
Nov	29.6 °C	-0.4 °C	152 mm	+70 mm
Dec	30.8 °C	+1.4 °C	8 mm	-7 mm

The year's extremes

Hottest day

36.3 °C

5 Mar 2025

Coldest day

16.2 °C

13 Jan 2025

Wettest day

54.5 mm

14 Apr 2025

Windiest day

26.5 km/h

27 Jan 2025

Strongest gust

53.3 km/h

23 Jul 2025

Hottest feels-like

43.2 °C

5 Mar 2025

Coldest feels-like

14.8 °C

13 Jan 2025

Sunniest day

12.1 h

1 Aug 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 Siem Reap?

Siem Reap has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 27.9 °C and it receives 1,350 mm of precipitation per year.

What is the hottest day ever recorded in Siem Reap?

The hottest day measured in Siem Reap between 1940 and 2025 was 28 April 2016, reaching 40.1 °C.

What is the coldest day in Siem Reap?

The coldest day measured in Siem Reap between 1940 and 2025 was 12 January 1955, at 12.4 °C.

Does it snow in Siem Reap?

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

Has the climate of Siem Reap warmed?

Yes: Siem Reap warmed by +1.9 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Siem Reap?

The wettest day measured in Siem Reap between 1940 and 2025 was 4 October 1990, with 167 mm of rain in 24 hours.

What was the windiest day in Siem Reap?

The windiest day measured in Siem Reap between 1940 and 2025 was 12 November 1973, with winds reaching 34.7 km/h.

What is the warmest month in Siem Reap?

The warmest month in Siem Reap is April (29.8 °C on average); the coldest is December (25.4 °C).

How much does it rain in Siem Reap?

Siem Reap receives on average 1,350 mm of precipitation per year, spread over about 184 rainy days.

Is it sunny in Siem Reap?

Siem Reap gets on average 10.3 hours of sunshine per day, roughly 3,760 hours per year over 1940-2025.

Are there tropical nights in Siem Reap?

Yes: Siem Reap has on average 350 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Siem Reap?

In Siem Reap, between 1940 and 2025, the highest apparent temperature reached 46.9 °C on 18 May 2010, and the lowest was 9.6 °C on 12 January 1955.

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