Siem Reap, Cambodia Weather
Siem Reap hourly forecast: next 24 hours
Today's high of 88°F (31°C) is right in line with the typical September high of 87°F (31°C).
Current conditions in detail
Siem Reap weather tomorrow (Thursday, September 17)
Tomorrow in Siem Reap looks light rain shower, with a high of 88° and an overnight low of 77°. There is a 87% chance of rain - plan accordingly. Winds top out near 7 mph, and the UV index reaches 12 (extreme).
Siem Reap 14-day forecast
About the weather in Siem Reap
There is not much of a seasonal calendar in Siem Reap. Its warmest and coolest months differ by 4°C, against a dataset median nearer 15°C, which leaves 94°F (34°C) in April and 86°F (30°C) in December as the two ends of the year.
Siem Reap weather: quick facts
- Hottest month: April - highs near 94°F (34°C)
- Coldest month: December - highs near 86°F (30°C)
- Decade extremes (2015-2024): 104°F (40°C) high · 57°F (14°C) low
- Wettest month: September (27 rainy days) · Sunniest: March (11.1 h sun/day)
- Climate type: tropical wet-and-dry
- Annual swing: 4°C between the average warmest and coolest month · day to night: 8°C
- Months averaging 30°C or hotter: 12
- Average humidity: 75%
Temperatures through the year
December is the coolest month, with highs of 86°F (30°C) and lows near 71°F (22°C). Warmth peaks in April: highs of 94°F (34°C), lows of 78°F (26°C). Sunshine averages 9.6 hours a day over the year, peaking in March at 11.1 hours.
Rain, sun and snow
Between the average April and the average December lie 4°C, a narrower spread than about 87% of the cities we track. Average highs hold at or above 30°C for 12 months of the year, January through December being the unbroken run. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 104°F (40°C) and the lowest daily minimum 57°F (14°C).
Season by season
March through May
Through March through May, Siem Reap is punishingly hot: 93°F (34°C) by day, 78°F (26°C) after dark, and rain falls on around 48 of the 90 days. Daylight is generous - around 10.6 hours of sun a day. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
June through August
June through August sits firmly in the heat here - highs near 90°F (32°C), nights near 78°F (25°C), and rain falls on around 73 of the 90 days.
September through November
September through November is hot here - highs near 87°F (30°C), nights near 75°F (24°C), and rain falls on around 63 of the 90 days.
December through February
Through December through February, Siem Reap sits firmly in the heat: 88°F (31°C) by day, 72°F (22°C) after dark, and rain comes on about 10 days over the three months. Daylight is generous - around 10.3 hours of sun a day.
Average temperatures in Siem Reap by month
| Month | High | Low | Rain days | Precipitation | Sunshine | Humidity |
|---|---|---|---|---|---|---|
| January | 88° | 71° | 2 | 0.7 in | 10.3 h/day | 64% |
| February | 91° | 73° | 4 | 1.0 in | 10.7 h/day | 62% |
| March | 94° | 77° | 10 | 2.0 in | 11.1 h/day | 66% |
| April | 94° | 78° | 14 | 4.2 in | 10.8 h/day | 69% |
| May | 92° | 79° | 23 | 7.7 in | 10.0 h/day | 77% |
| June | 91° | 78° | 22 | 6.1 in | 9.4 h/day | 78% |
| July | 89° | 78° | 26 | 8.7 in | 8.1 h/day | 81% |
| August | 89° | 77° | 25 | 8.4 in | 8.5 h/day | 81% |
| September | 87° | 76° | 27 | 12.8 in | 7.7 h/day | 86% |
| October | 87° | 75° | 23 | 10.1 in | 8.7 h/day | 85% |
| November | 87° | 74° | 13 | 4.0 in | 9.7 h/day | 78% |
| December | 86° | 71° | 4 | 1.0 in | 9.9 h/day | 70% |