Siem Reap Weather Forecast
Siem Reap weather: 82°F, overcast. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Siem Reap weather in September
Weather map for Siem Reap
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Climate in Siem Reap month by month
Average high, average low and total rainfall, based on three years of reanalysis data.
| Month | Avg high | Avg low | Rainfall | Rating |
|---|---|---|---|---|
| January | 87° | 68° | 0,0 in | ★★★★★ |
| February | 92° | 74° | 0,5 in | ★★★★☆ |
| March | 93° | 76° | 2,7 in | ★★★★☆ |
| April | 97° | 80° | 2,3 in | ★★★★☆ |
| May | 93° | 79° | 8,9 in | ★★☆☆☆ |
| June | 92° | 79° | 7,2 in | ★★★☆☆ |
| July | 90° | 78° | 10,7 in | ★★☆☆☆ |
| August | 91° | 77° | 6,5 in | ★★★☆☆ |
| September | 88° | 76° | 14,9 in | ★★☆☆☆ |
| October | 88° | 75° | 10,7 in | ★★☆☆☆ |
| November | 87° | 73° | 4,1 in | ★★★★☆ |
| December | 87° | 71° | 1,2 in | ★★★★★ |
Climate type: Tropical. Source: Open-Meteo archive (ERA5).
Best time to visit Siem Reap
Go in January, February and December. These months score highest on comfortable temperatures, low rainfall and useful daylight.
Hardest months: May, July and September - expect the least comfortable mix of heat, cold or rain.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- A packable rain shell - 7 of the next 7 days carry a real chance of rain
- Insect repellent and quick-dry fabrics for humidity
- Avoid exposed ridgelines, small boats and rooftop viewpoints while gusts stay above 35 mph.
- If your dates are flexible, avoid May, July and September - historically the least comfortable months here.
How Siem Reap compares with nearby places
Annual averages, and the difference against Siem Reap.
| Place | Distance | Avg temp | vs here | Annual rain |
|---|---|---|---|---|
| Suvarnabhumi Airport | 209 mi | 83°F | about the same | 68 in |
| Thailand | 226 mi | 83°F | +33°F warmer | 63 in |
| Bangkok | 226 mi | 83°F | +33°F warmer | 63 in |
| Grand Palace | 227 mi | 83°F | +33°F warmer | 63 in |
| Mekong River | 328 mi | 80°F | 35°F cooler | 85 in |
See the Siem Reap forecast by time range
Siem Reap weather - more answers
Explore Siem Reap
Every topic we hold for this place, and the same topic for the places around it.
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Frequently asked questions
Where is Siem Reap?
Siem Reap is a city in Cambodia. Its coordinates are 13.3671, 103.8448. It lies in Asia.
What is the weather like in Siem Reap right now?
It is currently 82°F (28°C) with overcast. Humidity is 76% and wind is 9 mph.
When is the best time to visit Siem Reap?
January, February and December offer the most comfortable conditions in Siem Reap, which has a tropical climate. May, July and September are usually the hardest months for outdoor plans.
What time zone is Siem Reap in?
Siem Reap observes Asia/Phnom_Penh (UTC+07:00). The local time is 4:20 AM.
How many people live in Siem Reap?
Siem Reap has a population of approximately 245.000.
What is the nearest airport to Siem Reap?
The closest airports are Suvarnabhumi Airport (BKK), 209 mi away.
What are the top things to do in Siem Reap?
Popular options include Angkor Wat, Angkor and Grand Palace.
What places are in Siem Reap?
Siem Reap covers 2 places in this atlas, including Angkor Wat and Angkor.
Related articles
Data sources and methodology
| Place data | USPOTUS Atlas dataset (cities-world) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 26, 2026 at 4:20 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
