Cambodia · 30-year monthly climate averages
Based on 30 years of climate data, the most comfortable months to visit Siem Reap are January, February and December, when daytime temperatures are agreeable and rainfall is relatively low.
Siem Reap sees its warmest weather in April, when daytime highs average around 34°C, and its coolest in December (around 29°C).
Annual precipitation totals roughly 1441mm — September is typically the wettest month (~301mm) and January the driest (~5mm).
A distinctly wetter period runs from May to October — worth planning around if you prefer dry days.
🟧 avg daytime high · 🟦 dashed: avg nighttime low · bars: monthly rainfall
Daily forecast highs vs the 30-year normal — last 61 days
Each bar is one day: orange above normal, blue below.
| Month | High / Low | Rainfall | Travel rating |
|---|---|---|---|
| January | 30° / 22°C | 5mm | 👍 Good |
| February | 32° / 24°C | 7mm | 👍 Good |
| March | 33° / 25°C | 30mm | 👍 Good |
| April | 34° / 26°C | 63mm | 🤔 Fair |
| May | 33° / 26°C | 157mm | ⚠️ Challenging |
| June | 32° / 26°C | 208mm | ⚠️ Challenging |
| July | 32° / 25°C | 191mm | ⚠️ Challenging |
| August | 31° / 25°C | 198mm | ⚠️ Challenging |
| September | 30° / 25°C | 301mm | ⚠️ Challenging |
| October | 30° / 24°C | 209mm | 🤔 Fair |
| November | 30° / 23°C | 65mm | 👍 Good |
| December | 29° / 21°C | 8mm | 🌟 Great |
January in Siem Reap is hot, with average daytime highs around 30°C (87°F) and nighttime lows near 22°C (71°F). Expect roughly 5mm of precipitation, and rain is rare.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
February in Siem Reap is hot, with average daytime highs around 32°C (90°F) and nighttime lows near 24°C (74°F). Expect roughly 7mm of precipitation, and rain is rare.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
March in Siem Reap is hot, with average daytime highs around 33°C (92°F) and nighttime lows near 25°C (77°F). Expect roughly 30mm of precipitation, with little rainfall.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
April in Siem Reap is hot, with average daytime highs around 34°C (93°F) and nighttime lows near 26°C (79°F). Expect roughly 63mm of precipitation, with a moderate amount of rain.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle
May in Siem Reap is hot, with average daytime highs around 33°C (91°F) and nighttime lows near 26°C (79°F). Expect roughly 157mm of precipitation, and this is one of the wetter months.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
June in Siem Reap is hot, with average daytime highs around 32°C (90°F) and nighttime lows near 26°C (79°F). Expect roughly 208mm of precipitation, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
July in Siem Reap is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (78°F). Expect roughly 191mm of precipitation, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
August in Siem Reap is hot, with average daytime highs around 31°C (88°F) and nighttime lows near 25°C (78°F). Expect roughly 198mm of precipitation, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
September in Siem Reap is hot, with average daytime highs around 30°C (87°F) and nighttime lows near 25°C (76°F). Expect roughly 301mm of precipitation, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — breathable summer clothing · sunscreen, hat and sunglasses · refillable water bottle · compact umbrella or rain jacket
October in Siem Reap is warm, with average daytime highs around 30°C (86°F) and nighttime lows near 24°C (75°F). Expect roughly 209mm of precipitation, and heavy rainfall is common — this is peak wet season territory.
🎒 What to pack — light summer clothing · sunscreen and sunglasses · compact umbrella or rain jacket
November in Siem Reap is warm, with average daytime highs around 30°C (85°F) and nighttime lows near 23°C (73°F). Expect roughly 65mm of precipitation, with a moderate amount of rain.
🎒 What to pack — light summer clothing · sunscreen and sunglasses
December in Siem Reap is warm, with average daytime highs around 29°C (85°F) and nighttime lows near 21°C (70°F). Expect roughly 8mm of precipitation, and rain is rare.
🎒 What to pack — light summer clothing · sunscreen and sunglasses