Year-round weather and climate in Siem Reap, Cambodia
Average temperatures in Siem Reap run from an average low of 21°C70°F in January up to an average high of 35°C95°F in March. January is the driest month at 2 rainy days; September the wettest at 29. Here is the annual climate data, so you know what you are packing for.
Good to know
- Population
- 139K
- Currency
- KHR
- Language
- Khmer
- Time zone
- Phnom Penh
Best time to visit
To avoid the most intense heat, the best time to visit is during the milder season around December, January, and February.
Rain character
Tropical Downpours: Expect intense bursts of rain during wetter months. Pack quick-drying footwear and a compact umbrella.
Day-to-night swing
Evening Chill: Temperatures drop by a noticeable 10°C18°F when the sun goes down. A light sweater or jacket is usually all you need for evening plans.
Seasonality Profile
Tropical Monsoon: Consistent heat year-round. Defined entirely by its dramatic shift between extreme dry and torrential wet seasons.
Evening vibe
Seasonal Terraces: During the more temperate months, the city opens up with lively outdoor terraces. For the rest of the year, expect to dine indoors.
Sightseeing stamina
High Heat Fatigue: During the hotter half of the year, midday sun can cause heat exhaustion. Adopt a local rhythm: sightsee early, and rest indoors at 2 PM.
Average temperatures, sunshine, and rainfall
Average monthly weather in Siem Reap, based on recent historical data. Essential insights on temperature swings, expected rainfall, and daily sunshine.
Bars span the average daily low to high. Jan is typically driest at 2 days (25mm); Sep the wettest at 29 days (380mm).
| Month | Average high | Average low | Sunshine hours | Rainy days | Total rainfall |
|---|---|---|---|---|---|
| Jan | 31°C / 88°F | 21°C / 70°F | 10h | 2 | 25mm |
| Feb | 33°C / 91°F | 23°C / 73°F | 11h | 5 | 34mm |
| Mar | 35°C / 94°F | 25°C / 77°F | 11h | 10 | 49mm |
| Apr | 34°C / 94°F | 26°C / 78°F | 11h | 16 | 130mm |
| May | 33°C / 92°F | 26°C / 79°F | 10h | 23 | 227mm |
| Jun | 33°C / 91°F | 26°C / 78°F | 10h | 22 | 162mm |
| Jul | 32°C / 89°F | 25°C / 77°F | 8h | 28 | 280mm |
| Aug | 32°C / 89°F | 25°C / 77°F | 9h | 27 | 230mm |
| Sep | 31°C / 87°F | 24°C / 76°F | 7h | 29 | 380mm |
| Oct | 30°C / 86°F | 24°C / 74°F | 8h | 24 | 306mm |
| Nov | 31°C / 87°F | 23°C / 73°F | 10h | 13 | 125mm |
| Dec | 30°C / 86°F | 21°C / 70°F | 10h | 4 | 29mm |
Weather data by Open-Meteo.com (opens in a new tab)
Frequently Asked Questions
When is the sunniest time of year to visit Siem Reap?
The most sunshine in Siem Reap comes around March, averaging 11 hours a month. If you're heading there then, pack your sunglasses and sunscreen.
What clothes should I pack for Siem Reap?
Your packing list depends entirely on when you travel. Temperatures in Siem Reap swing from an average low of 21°C70°F in January up to 35°C95°F in March. The Packola app builds a tailored packing list for you based on the live weather forecast for your exact travel dates.
Do I need to pack an umbrella for Siem Reap?
Siem Reap gets rain on about 203 days out of the year. The wettest month is September. If you're traveling during the rainy season, you'll definitely want to pack an umbrella and a light rain jacket.
Pack smarter.
Averages get you close, but the week you travel is what matters. Get the live forecast, a smart packing list, and discover the best local spots and activities in Siem Reap with Packola.
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