Phnom Penh, Cambodia Climate & Monthly Averages
Phnom Penh has a tropical wet-and-dry climate. April is the hottest month, averaging 94° by day; December is the coldest at 87°.
Rain, not cold, divides the year in Phnom Penh
Temperature barely moves in Phnom Penh - 3°C between the average April and the average December. Rainfall does the work instead: 12.0 inches (306 mm) in October against 14 mm (0.6 in) in February.
The wet-and-dry rhythm at a glance
Average highs hold at or above 30°C for 12 months of the year, January through December being the unbroken run. December is the coolest month, with highs of 87°F (30°C) and lows near 74°F (23°C). April is the warm end of the year, averaging 94°F (35°C) by day and 79°F (26°C) overnight. Across the gridded 2015-2024 daily record, the highest daily maximum for this location was 103°F (39°C) and the lowest daily minimum 65°F (18°C).
The wettest month is October (12.0 inches (306 mm) across 25 days) and the driest February.
Between the average April and the average December lie 3°C, a narrower spread than all but 9% of the 3496 cities in our dataset.
More climate facts for Phnom Penh
- Hottest month: April - highs near 94°F (35°C)
- Coldest month: December - highs near 87°F (30°C)
- Decade extremes (2015-2024): 103°F (39°C) high · 65°F (18°C) low
- Wettest month: October (25 rainy days) · Sunniest: March (11.4 h sun/day)
- Climate type: tropical wet-and-dry
- Annual swing: 3°C between the average warmest and coolest month · day to night: 7°C
- Months averaging 30°C or hotter: 12
- Average humidity: 75%
Choosing the right part of the year in Phnom Penh
Choose dates by rain, not just temperature
The best time to visit Phnom Penh is generally November to February, when humidity and rainfall are at their lowest, which is what actually varies here. Daytime temperatures in that window sit near 88°F (31°C), with rain on about 7 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 Phnom Penh 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 (35°C) with 79°F (26°C).
Warm all year: the monthly rain pattern
Each card shows the average high and low. The bar places that month between Phnom Penh's coldest night and warmest afternoon.
January
- Rain
- 4 days
- Sunshine
- 10.4 h
- Daylight
- 11.5 h
February
- Rain
- 2 days
- Sunshine
- 11.0 h
- Daylight
- 11.7 h
March
- Rain
- 5 days
- Sunshine
- 11.4 h
- Daylight
- 12.0 h
April
- Rain
- 14 days
- Sunshine
- 11.2 h
- Daylight
- 12.4 h
May
- Rain
- 25 days
- Sunshine
- 10.1 h
- Daylight
- 12.7 h
June
- Rain
- 24 days
- Sunshine
- 9.3 h
- Daylight
- 12.8 h
July
- Rain
- 24 days
- Sunshine
- 8.4 h
- Daylight
- 12.7 h
August
- Rain
- 26 days
- Sunshine
- 9.0 h
- Daylight
- 12.5 h
September
- Rain
- 28 days
- Sunshine
- 8.0 h
- Daylight
- 12.2 h
October
- Rain
- 25 days
- Sunshine
- 8.7 h
- Daylight
- 11.9 h
November
- Rain
- 16 days
- Sunshine
- 9.8 h
- Daylight
- 11.6 h
December
- Rain
- 7 days
- Sunshine
- 9.9 h
- Daylight
- 11.4 h
Looking for warmer alternatives? Browse warm places by month, or compare Phnom Penh's coolest part of the year: October, December, November.
Monthly temperature and rain table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 89° | 74° | 4 | 0.7 in | 10.4 h/day | 11.5 h | 13% | 67% |
| February | 91° | 74° | 2 | 0.6 in | 11.0 h/day | 11.7 h | 8% | 62% |
| March | 94° | 77° | 5 | 1.5 in | 11.4 h/day | 12.0 h | 16% | 63% |
| April | 94° | 79° | 14 | 3.7 in | 11.2 h/day | 12.4 h | 45% | 69% |
| May | 92° | 80° | 25 | 7.0 in | 10.1 h/day | 12.7 h | 80% | 77% |
| June | 90° | 78° | 24 | 6.4 in | 9.3 h/day | 12.8 h | 78% | 79% |
| July | 89° | 78° | 24 | 7.4 in | 8.4 h/day | 12.7 h | 79% | 80% |
| August | 90° | 78° | 26 | 8.2 in | 9.0 h/day | 12.5 h | 83% | 80% |
| September | 88° | 77° | 28 | 11.7 in | 8.0 h/day | 12.2 h | 92% | 85% |
| October | 87° | 76° | 25 | 12.0 in | 8.7 h/day | 11.9 h | 82% | 85% |
| November | 87° | 76° | 16 | 6.0 in | 9.8 h/day | 11.6 h | 52% | 80% |
| December | 87° | 74° | 7 | 1.6 in | 9.9 h/day | 11.4 h | 23% | 72% |
How Phnom Penh compares for rain and warmth
- Phnom Penh 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 199 days a year - more wet days than 91% 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 Phnom Penh
March through May
Through March through May, Phnom Penh brings serious heat: 94°F (34°C) by day, 79°F (26°C) after dark, and rain falls on around 43 of the 90 days. Daylight is generous - around 10.9 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 is hot here - highs near 90°F (32°C), nights near 78°F (25°C), and rain falls on around 74 of the 90 days.
September through November
September through November in Phnom Penh is hot, with daytime highs averaging 87°F (31°C) and nights around 76°F (24°C); rain falls on around 69 of the 90 days.
December through February
December through February in Phnom Penh brings hot afternoons, with daytime highs averaging 89°F (32°C) and nights around 74°F (23°C); rain comes on about 13 days over the three months. Daylight is generous - around 10.4 hours of sun a day.
Questions about heat and rain in Phnom Penh
Is Phnom Penh a wet city?
What is the average temperature in Phnom Penh?
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Phnom Penh 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.