- Rain mm/yr
- 1,470
- Snowfall
- None (tropical climate; snowfall not relevant)
Updated July 2026 · Sources cited: en.climate-data.org, travelchinaguide.com
Good to know
Good to Know
- Siem Reap is cooler than other parts of Cambodia during the dry season, making it particularly suited to the northern location of the temples.
- In the rainy season, rainfall typically arrives in short, heavy afternoon or evening bursts (especially May–June) rather than all-day drizzles, leaving usable morning windows for exploration.
- September and October can bring flooding in low-lying rural areas, but city infrastructure generally handles water well and most temples remain accessible.
- Relative humidity stays high year-round (58–75%), making even cooler months feel humid; late afternoon outdoor activities during peak heat (April–May) are uncomfortable.
- November is an often-overlooked alternative to peak December–February: rainy season has just ended, landscapes remain green, prices are lower, and crowds build gradually.
Seasons
Dry Season
- Months
- November to April
- Characteristics
- Sunny, warm, and humid with minimal rainfall (generally below 55mm monthly precipitation)
Rainy Season
- Months
- May to October
- Characteristics
- Heavy rainfall with high humidity (over 70%), rainy days typically 15–22 days per month
Humidity
- Year Round Range Percent
- 58–75
- Lowest Month
- March (58%)
- Highest Months
- September (reaching 75%)
Rainfall
- Annual Total Mm
- 1470
- Annual Total Inches
- 58
- Peak Rainfall Period
- September–October
Driest Month
- Month
- January
- Rainy Days
- 1
- Rainfall Mm
- 9.8
- Rainfall Inches
- 0.4
Wettest Month
- Month
- September
- Rainy Days
- 18
- Rainfall Mm
- 286
- Rainfall Inches
- 11
Snowfall
None (tropical climate; snowfall not relevant)
Temperature
- Nighttime Lows Celsius
- 22–27
- Year Round Range Celsius
- 32–36
- Nighttime Lows Fahrenheit
- 72–81
- Year Round Range Fahrenheit
- 90–97
Coolest Months
- Months
- December–January
- Daytime Range Celsius
- 24–32
- Daytime Range Fahrenheit
- 75–90
- Average Temperature Celsius
- 25
- Average Temperature Fahrenheit
- 77
Peak Hot Months
- Months
- April–May
- Daytime High Celsius
- 35
- Daytime High Fahrenheit
- 95
- Note
- Can occasionally exceed 39°C (102°F)
Best Months To Visit
- Optimal
- December–January
- Reason
- Clear skies, dry weather, moderate temperatures, and lowest humidity
Worst Months To Visit
- Months
- April–May and September–October
- April May
- Extreme heat and humidity; April is the hottest month
- September October
- Highest rainfall and humidity; risk of flooding in low-lying areas
Tropical Climate Overview
Siem Reap has a tropical climate with two distinct seasons: dry and rainy.
AI-generated estimateData refreshed July 2026
Sources cited for this category
These are the sources cited in this climate & weather research for this city. Individual figures may not each trace to one of them.
More About Siem Reap
Data last updated July 2026 · Verify anything important.