Siem Reap, Cambodia Climate & Monthly Averages
Siem Reap has a tropical wet-and-dry climate. April is the hottest month, averaging 94° by day; December is the coldest at 86°.
Rain, not cold, divides the year 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.
The wet-and-dry rhythm at a glance
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.
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).
More climate facts for Siem Reap
- 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%
Choosing the right part of the year in Siem Reap
Choose dates by rain, not just temperature
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.
What the humidity changes
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).
Warm all year: the monthly rain pattern
Each card shows the average high and low. The bar places that month between Siem Reap's coldest night and warmest afternoon.
January
- Rain
- 2 days
- Sunshine
- 10.3 h
- Daylight
- 11.4 h
February
- Rain
- 4 days
- Sunshine
- 10.7 h
- Daylight
- 11.7 h
March
- Rain
- 10 days
- Sunshine
- 11.1 h
- Daylight
- 12.0 h
April
- Rain
- 14 days
- Sunshine
- 10.8 h
- Daylight
- 12.4 h
May
- Rain
- 23 days
- Sunshine
- 10.0 h
- Daylight
- 12.7 h
June
- Rain
- 22 days
- Sunshine
- 9.4 h
- Daylight
- 12.9 h
July
- Rain
- 26 days
- Sunshine
- 8.1 h
- Daylight
- 12.8 h
August
- Rain
- 25 days
- Sunshine
- 8.5 h
- Daylight
- 12.6 h
September
- Rain
- 27 days
- Sunshine
- 7.7 h
- Daylight
- 12.2 h
October
- Rain
- 23 days
- Sunshine
- 8.7 h
- Daylight
- 11.8 h
November
- Rain
- 13 days
- Sunshine
- 9.7 h
- Daylight
- 11.5 h
December
- Rain
- 4 days
- Sunshine
- 9.9 h
- Daylight
- 11.3 h
Looking for warmer alternatives? Browse warm places by month, or compare Siem Reap's coolest part of the year: December, October, September.
Monthly temperature and rain table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 88° | 71° | 2 | 0.7 in | 10.3 h/day | 11.4 h | 7% | 64% |
| February | 91° | 73° | 4 | 1.0 in | 10.7 h/day | 11.7 h | 13% | 62% |
| March | 94° | 77° | 10 | 2.0 in | 11.1 h/day | 12.0 h | 32% | 66% |
| April | 94° | 78° | 14 | 4.2 in | 10.8 h/day | 12.4 h | 48% | 69% |
| May | 92° | 79° | 23 | 7.7 in | 10.0 h/day | 12.7 h | 75% | 77% |
| June | 91° | 78° | 22 | 6.1 in | 9.4 h/day | 12.9 h | 72% | 78% |
| July | 89° | 78° | 26 | 8.7 in | 8.1 h/day | 12.8 h | 83% | 81% |
| August | 89° | 77° | 25 | 8.4 in | 8.5 h/day | 12.6 h | 82% | 81% |
| September | 87° | 76° | 27 | 12.8 in | 7.7 h/day | 12.2 h | 91% | 86% |
| October | 87° | 75° | 23 | 10.1 in | 8.7 h/day | 11.8 h | 74% | 85% |
| November | 87° | 74° | 13 | 4.0 in | 9.7 h/day | 11.5 h | 42% | 78% |
| December | 86° | 71° | 4 | 1.0 in | 9.9 h/day | 11.3 h | 13% | 70% |
How Siem Reap compares for rain and warmth
- 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.
These comparisons use the same ten-year window for every city in the dataset.
How the calendar changes in warm-weather 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.
Questions about heat and rain in Siem Reap
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?
Siem Reap temperature extremes in the 2015–2024 dataset
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need another precipitation unit? Use the rainfall converter.