Siem Reap, Cambodia Climate & Monthly Averages
The climate of 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.
Climate 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).
How Siem Reap compares
- Siem Reap averages 82°F (28°C) across the year - warmer than any other city in our 3496-city dataset.
- Rain or snow reaches the ground on 193 days a year - more wet days than 89% of the 3496 cities we track.
Ranked against every city in our dataset, each measured on the same ten-year window.
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
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.
Climate questions, answered
How much sun does Siem Reap get?
How many hot months does Siem Reap have?
How often does it rain in Siem Reap?
Is Siem Reap a wet city?
How much does the weather change through the year in Siem Reap?
What is the average temperature in Siem Reap?
Best time to visit Siem Reap
Aim for November to February if you get the choice: humidity and rainfall are at their lowest, which is what actually varies here, and highs average 88°F (31°C) against roughly 6 wet days a month. For the same question asked the other way round, see where else is warm in November.
Pack for Siem Reap with lightweight, breathable clothing and serious sun protection, proper waterproofs rather than an umbrella - wet days are the norm here and moisture-wicking fabrics for the humidity. Note the gap between afternoon and night: April pairs 94°F (34°C) with 78°F (26°C).
Siem Reap temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ.