Siem Reap, Cambodia Climate & Monthly Averages
The climate of Siem Reap
Weather in Siem Reap is shaped by its tropical wet-and-dry climate - expect year-round warmth split between a rainy season and a pronounced dry season. April afternoons typically reach 94°F (34°C), while December highs hover near 86°F (30°C). Annual precipitation averages 66.7 inches (1694 mm) over about 193 rainy days.
Climate quick facts
- Hottest month: April - highs near 94°F (34°C)
- Coldest month: December - highs near 86°F (30°C)
- Record high: 104°F (40°C) · Record low: 57°F (14°C) (2015–2024)
- Wettest month: September (27 rainy days) · Sunniest: March (11.1 h sun/day)
- Climate type: tropical wet-and-dry - year-round warmth split between a rainy season and a pronounced dry season
Temperatures through the year
The warmest stretch of the year centers on April. Highs average 94°F (34°C) and overnight lows stay near 78°F (26°C). The coolest month is December, with typical highs of 86°F (30°C) and lows around 71°F (22°C). Based on 2015–2024 weather data, temperatures have reached as high as 104°F (40°C) and dropped as low as 57°F (14°C).
Rain, sun and snow
September is usually the wettest month. It brings about 12.8 inches (324 mm) of rain over 27 days, while January is the driest. March brings the most sunshine, averaging 11.1 hours of sun a day.
Monthly climate table
| 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% |
Siem Reap month by month
Siem Reap weather in January
January brings highs around 88°F (31°C), lows near 71°F (22°C), about 2 wet days - typically the driest month of the year in Siem Reap.
Siem Reap weather in February
February brings highs around 91°F (33°C), lows near 73°F (23°C), about 4 wet days.
Siem Reap weather in March
March brings highs around 94°F (34°C), lows near 77°F (25°C), about 10 wet days - typically the sunniest month of the year in Siem Reap.
Siem Reap weather in April
April brings highs around 94°F (34°C), lows near 78°F (26°C), about 14 wet days - typically the hottest month of the year in Siem Reap.
Siem Reap weather in May
May brings highs around 92°F (34°C), lows near 79°F (26°C), about 23 wet days.
Siem Reap weather in June
June brings highs around 91°F (33°C), lows near 78°F (26°C), about 22 wet days.
Siem Reap weather in July
July brings highs around 89°F (32°C), lows near 78°F (25°C), about 26 wet days.
Siem Reap weather in August
August brings highs around 89°F (32°C), lows near 77°F (25°C), about 25 wet days.
Siem Reap weather in September
September brings highs around 87°F (31°C), lows near 76°F (24°C), about 27 wet days - typically the wettest month of the year in Siem Reap.
Siem Reap weather in October
October brings highs around 87°F (30°C), lows near 75°F (24°C), about 23 wet days.
Siem Reap weather in November
November brings highs around 87°F (31°C), lows near 74°F (23°C), about 13 wet days.
Siem Reap weather in December
December brings highs around 86°F (30°C), lows near 71°F (22°C), about 4 wet days - typically the coldest month of the year in Siem Reap.
Seasons in Siem Reap
March through May
March through May in Siem Reap turns very hot, with daytime highs averaging 93°F (34°C) and nights around 78°F (26°C); expect showers on roughly 48 days across the season. With the humidity factored in, afternoons often feel hotter than the thermometer reads - run the numbers through the humidity and dew point converter to see why.
June through August
June through August in Siem Reap is hot, with daytime highs averaging 90°F (32°C) and nights around 78°F (25°C); expect showers on roughly 73 days across the season.
September through November
September through November in Siem Reap brings hot afternoons, with daytime highs averaging 87°F (30°C) and nights around 75°F (24°C); expect showers on roughly 63 days across the season.
December through February
December through February in Siem Reap runs hot, with daytime highs averaging 88°F (31°C) and nights around 72°F (22°C); rain falls on about 10 days over the three months.
Climate questions, answered
What is the average temperature in Siem Reap?
Is Siem Reap hot in summer?
Is Siem Reap cold in winter?
How many rainy days does Siem Reap get in a year?
Best time to visit Siem Reap
The best time to visit Siem Reap is generally November to February, when these months combine the driest skies with the most comfortable heat. Daytime temperatures in that window typically sit near 88°F (31°C).
Pack for Siem Reap with lightweight, breathable clothing and strong sun protection for the hot months; a compact umbrella or rain shell - showers are a regular feature; moisture-wicking fabrics to cope with the humidity. Evenings can feel noticeably cooler than afternoons - April nights average 78°F (26°C).
Siem Reap temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.