Climate Overview
The climate in Siem Reap–Angkor International Airport is hot. The average annual temperature is 28°C and approximately 1499mm of precipitation falls per year. September is the wettest month, receiving around 275mm of rainfall. Siem Reap–Angkor International Airport is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: April, March, May. The coldest months are December, February, January, when temperatures can drop to 21°C.
Temperature
Siem Reap–Angkor International Airport sees moderate temperature variation throughout the year, ranging from 21°C to 36°C. April is the hottest month, with daytime highs reaching 36°C and an average of 31°C. December is the coolest month, with minimum temperatures around 21°C and an average of 26°C. On average, daily temperatures fluctuate by about 9°C between overnight lows and afternoon highs.
Precipitation
Siem Reap–Angkor International Airport is a fairly wet location, receiving approximately 1499mm of precipitation annually, which averages out to around 125mm per month. The wettest month is September, averaging 275mm of rainfall. August and July also tend to see above-average precipitation. The driest month is February, with just 7mm. That's 269mm less than September, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.
Wind
Siem Reap–Angkor International Airport is relatively calm, with an average annual wind speed of 2km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 2km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 1km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.
Seasons
3 days until Summer
It is currently spring in Siem Reap–Angkor International Airport, which began on March 20, 2026. Siem Reap–Angkor International Airport is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in April at around 36°C, while the coldest stretch bottoms out in December near 21°C. Summer is next, beginning on June 21, 2026 — 3 days from now.
Spring
Temperatures range from 25 to 36°C. Precipitation is moderate at around 266mm for the season, averaging 89mm per month. Winds are generally light, averaging 2km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 25 to 34°C. Rainfall is heavy, totalling around 623mm across the season with a monthly average of 208mm. Winds are generally light, averaging 2km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 23 to 32°C. Rainfall is heavy, totalling around 561mm across the season with a monthly average of 187mm. Winds are generally light, averaging 2km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 21 to 34°C. Rainfall is relatively light, with around 49mm over the season and a monthly average of 16mm. Winds are generally light, averaging 2km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Siem Reap–Angkor International Airport based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
