Siem Reap sits in Cambodia’s Mekong-Tonle Sap basin, the low-lying heart of the country where the wet season runs from roughly May through October and the Tonle Sap Lake’s famous seasonal flood pulse, in which the Tonle Sap River reverses direction each year, drives much of the region’s flooding.
Near Angkor Wat, the city sits close to the Tonle Sap Lake’s northern shore, where the lake’s seasonal expansion can affect low-lying areas. Major Mekong flood years, including 2000, 2011, and 2013, showed how a wet monsoon season upstream can raise water levels across this entire basin for weeks at a time, and Cambodia’s Ministry of Water Resources and Meteorology uses radar alongside river gauges to track both direct rainfall and the river system’s slower, larger rises. Learn more: Flash Flood Warning Signs on Radar · Open the full Rain Map
Frequently Asked Questions
Is it raining in Siem Reap right now?
The map above shows recent radar observations over Siem Reap where coverage is available. Use the map legend and timestamp to interpret the imagery. A blank map over Siem Reap can mean no detected precipitation, missing coverage, delayed data, or rain too light for radar to detect.
How often does the Siem Reap rain radar update?
Updates depend on the radar provider and local network. Check the timestamp on the map for the latest available frame, and press play to compare recent observations. Radar imagery can lag conditions on the ground.
Can I see if a storm is heading toward Siem Reap?
Press play to compare recent radar frames over Cambodia and see the direction of detected rain. This can help you assess approaching showers near Siem Reap, but storms can grow or change direction; check your local weather service for forecasts and warnings.
Is this Siem Reap rain radar free to use?
Yes, completely free – no account, app download, or sign-up required. It works in any browser on desktop and mobile.
Rain in Siem Reap by month
Siem Reap gets about 1,261 mm (49.7 in) of rain in an average year. The wettest month is September, with 231 mm (9.1 in), and the driest is December, with 7 mm (0.3 in).
| Month | Average rain | Average temperature |
|---|---|---|
| January | 12 mm (0.5 in) | 27.0 °C (81 °F) |
| February | 16 mm (0.6 in) | 29.1 °C (84 °F) |
| March | 46 mm (1.8 in) | 30.6 °C (87 °F) |
| April | 75 mm (2.9 in) | 30.6 °C (87 °F) |
| May | 140 mm (5.5 in) | 29.4 °C (85 °F) |
| June | 168 mm (6.6 in) | 28.0 °C (82 °F) |
| July | 197 mm (7.8 in) | 27.2 °C (81 °F) |
| August | 195 mm (7.7 in) | 27.1 °C (81 °F) |
| September | 231 mm (9.1 in) | 27.0 °C (81 °F) |
| October | 138 mm (5.4 in) | 26.9 °C (80 °F) |
| November | 37 mm (1.5 in) | 26.4 °C (80 °F) |
| December | 7 mm (0.3 in) | 26.0 °C (79 °F) |
Long-term monthly averages from NASA POWER (MERRA-2 satellite reanalysis). They describe the wider area around Siem Reap and can differ slightly from local weather-station records.