Home › Cities › Cambodia › Siem Reap
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 97°F, while the coldest is December averaging around 65°F at night. Precipitation totals about 58 inches a year and is strongly seasonal — September alone averages 11.9 inches while January barely receives 0.27 inches.
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 (°F) | 88 | 92 | 96 | 97 | 95 | 93 | 91 | 90 | 89 | 88 | 88 | 86 |
| Avg temp (°F) | 77 | 80 | 85 | 87 | 86 | 85 | 84 | 83 | 82 | 81 | 79 | 76 |
| Avg low (°F) | 65 | 68 | 74 | 77 | 77 | 77 | 76 | 76 | 75 | 73 | 70 | 65 |
| Precipitation (in) | 0.3 | 0.4 | 2.2 | 3.2 | 8.0 | 7.8 | 8.8 | 10.0 | 11.9 | 4.2 | 1.2 | 0.5 |
| Jan – Jun | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|
| Avg high (°F) | 88 | 92 | 96 | 97 | 95 | 93 |
| Avg temp (°F) | 77 | 80 | 85 | 87 | 86 | 85 |
| Avg low (°F) | 65 | 68 | 74 | 77 | 77 | 77 |
| Precipitation (in) | 0.3 | 0.4 | 2.2 | 3.2 | 8.0 | 7.8 |
| Jul – Dec | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|
| Avg high (°F) | 91 | 90 | 89 | 88 | 88 | 86 |
| Avg temp (°F) | 84 | 83 | 82 | 81 | 79 | 76 |
| Avg low (°F) | 76 | 76 | 75 | 73 | 70 | 65 |
| Precipitation (in) | 8.8 | 10.0 | 11.9 | 4.2 | 1.2 | 0.5 |
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 ≥ 90°F (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 ≥ 90°F (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 ≥ 90°F (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 (mph) | 6.0 | 5.6 | 5.0 | 4.3 | 4.5 | 5.5 | 5.8 | 5.5 | 3.9 | 4.5 | 5.8 | 6.8 |
| 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 (mph) | 6.0 | 5.6 | 5.0 | 4.3 | 4.5 | 5.5 |
| 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 (mph) | 5.8 | 5.5 | 3.9 | 4.5 | 5.8 | 6.8 |
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.