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Siem Reap, Cambodia climate
Aw Tropical savanna (dry winter)
Siem Reap has a mildly seasonal tropical climate (Tropical savanna (dry winter), Köppen Aw). The hottest month is April with an average daily high near 36°C, while the coldest is December averaging around 18°C at night. Precipitation totals about 1483 mm a year and is strongly seasonal — September alone averages 302 mm while January barely receives 7 mm.
Temperature & precipitation
Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figuresHours of sunshine per day
Estimated sunny hours each month — daylight length × clear-sky fraction · 1991–2020 monthly cloud cover (NASA POWER)Siem Reap climate normals (1991–2020)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 33 | 35 | 36 | 35 | 34 | 33 | 32 | 32 | 31 | 31 | 30 |
| Avg temp (°C) | 25 | 27 | 29 | 30 | 30 | 29 | 29 | 28 | 28 | 27 | 26 | 24 |
| Avg low (°C) | 18 | 20 | 23 | 25 | 25 | 25 | 25 | 24 | 24 | 23 | 21 | 18 |
| Precipitation (mm) | 7 | 11 | 56 | 81 | 202 | 199 | 223 | 254 | 302 | 106 | 30 | 13 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°C) | 31 | 33 | 35 | 36 | 35 | 34 |
| Avg temp (°C) | 25 | 27 | 29 | 30 | 30 | 29 |
| Avg low (°C) | 18 | 20 | 23 | 25 | 25 | 25 |
| Precipitation (mm) | 7 | 11 | 56 | 81 | 202 | 199 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°C) | 33 | 32 | 32 | 31 | 31 | 30 |
| Avg temp (°C) | 29 | 28 | 28 | 27 | 26 | 24 |
| Avg low (°C) | 25 | 24 | 24 | 23 | 21 | 18 |
| Precipitation (mm) | 223 | 254 | 302 | 106 | 30 | 13 |
How often — frequency of weather events
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 1 | 2 | 4 | 8 | 15 | 15 | 17 | 18 | 18 | 11 | 4 | 0.9 |
| Days with high ≥ 32°C (days) | 13 | 20 | 26 | 26 | 27 | 24 | 21 | 19 | 14 | 12 | 12 | 9 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 1 | 2 | 4 | 8 | 15 | 15 |
| Days with high ≥ 32°C (days) | 13 | 20 | 26 | 26 | 27 | 24 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Days with measurable rain (days) | 17 | 18 | 18 | 11 | 4 | 0.9 |
| Days with high ≥ 32°C (days) | 21 | 19 | 14 | 12 | 12 | 9 |
Sky & atmosphere
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cloud cover (%) | 36 | 40 | 53 | 66 | 79 | 85 | 87 | 89 | 88 | 69 | 50 | 42 |
| Relative humidity (%) | 55 | 49 | 50 | 59 | 74 | 83 | 86 | 88 | 89 | 86 | 79 | 66 |
| Wind speed (km/h) | 9.7 | 9.0 | 8.1 | 7.0 | 7.2 | 8.9 | 9.4 | 8.8 | 6.3 | 7.2 | 9.3 | 11.0 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 36 | 40 | 53 | 66 | 79 | 85 |
| Relative humidity (%) | 55 | 49 | 50 | 59 | 74 | 83 |
| Wind speed (km/h) | 9.7 | 9.0 | 8.1 | 7.0 | 7.2 | 8.9 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Cloud cover (%) | 87 | 89 | 88 | 69 | 50 | 42 |
| Relative humidity (%) | 86 | 88 | 89 | 86 | 79 | 66 |
| Wind speed (km/h) | 9.4 | 8.8 | 6.3 | 7.2 | 9.3 | 11.0 |
Methodology & sources
Temperature & precipitation — 1991–2020 normals computed from 28 years of daily observations at Surin, a weather station, about 174 km from the city centre. The underlying daily records come from NOAA's global station network.
Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.