Weather in Siem Reap - 14-day forecast

Detailed weather forecast for Siem Reap, Cambodia: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.

Forecast for the next days in Siem Reap

today🌧️ 31°💧 1.3 mm

Sun🌧️ 32°💧 4.2 mm

Mon🌧️ 31°💧 8.2 mm

Tue🌧️ 32°💧 2.6 mm

Wed🌧️ 31°💧 8.6 mm

Thu🌧️ 30°💧 10.7 mm

Fri🌧️ 30°💧 15 mm

Sat🌧️ 25°💧 24.7 mm

Forecast vs 1991-2020 climate normal

How does the current forecast compare with normal?

We compare the coming days with weather usually observed at this time of year.

NASA POWER

Sunday 6 Sept in Siem Reap, the forecast high is 32°C. Typical daytime temperatures at this time of year range from 29°C to 31°C, so it will be exceptionally warm. It is warmer than 90% of similar days.

Saturday 5 Sept

31°Cwarmer than usual

usually 29°C–31°C

warmer than 76% of similar days

night: exceptionally warm rain: less rain than usual wind: exceptionally strong

Sunday 6 Sept

32°Cexceptionally warm

usually 29°C–31°C

warmer than 90% of similar days

night: exceptionally warm rain: typical rainfall wind: stronger than usual

Monday 7 Sept

31°Cwarmer than usual

usually 29°C–31°C

warmer than 81% of similar days

night: exceptionally warm rain: typical rainfall wind: typical

Tuesday 8 Sept

32°Cwarmer than usual

usually 29°C–31°C

warmer than 88% of similar days

night: exceptionally warm rain: less rain than usual wind: stronger than usual

Wednesday 9 Sept

31°Cwarmer than usual

usually 29°C–31°C

warmer than 82% of similar days

night: exceptionally warm rain: typical rainfall wind: typical

Thursday 10 Sept

30°Cnear normal

usually 29°C–31°C

night: exceptionally warm rain: more rain than usual wind: typical

Friday 11 Sept

30°Cnear normal

usually 29°C–31°C

night: exceptionally warm rain: more rain than usual wind: exceptionally strong

How warm was this week in previous years?

Each bar shows the average daily high during the same 7-day period in each year.

swipe to see more years →

cooler yearstypical rangewarmer years2026 forecastcurrent forecast

From 1981 to 2025, the 5-11 Sept period averaged 30°C by day. The coolest year was 1982 (28°C) and the warmest was 2024 (33°C). The current forecast averages 31°C - higher than in 87% of historical years.

Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.

14-day forecast - Siem Reap

Siem Reap - 14-day weather forecast infographic

Siem Reap 30 & 45-day weather - long-range outlook

Next 16 days · forecast

28°

around 25° at night · days with rain: 16

Weeks 3-4 · avg for September

32°

around 26° at night · rain chance 66%

Weeks 5-7 · avg for October

31°

around 25° at night · rain chance 59%

The 30 & 45-day outlook for Siem Reap: the next 16 days are a numerical forecast updated daily - on average 28° by day and 25° at night. Further out we rely on multi-year climate averages: around 32° in September, and about 31° in October. Forecasts beyond two weeks are indicative only.

Day-by-day forecast for Siem Reap

Saturday5 September 2026

🌧️31°light rain

sunrise 05:53 · sunset 18:13 · night 27° · evening 30° · rain 1.27 mm · humidity 62% · wind 6 m/s · clouds 90%

Sunday6 September 2026

🌧️32°light rain

sunrise 05:53 · sunset 18:13 · night 27° · evening 29° · rain 4.18 mm · humidity 60% · wind 5 m/s · clouds 77%

Monday7 September 2026

🌧️31°moderate rain

sunrise 05:54 · sunset 18:12 · night 26° · evening 28° · rain 8.2 mm · humidity 63% · wind 4 m/s · clouds 91%

Tuesday8 September 2026

🌧️32°light rain

sunrise 05:54 · sunset 18:11 · night 26° · evening 28° · rain 2.6 mm · humidity 60% · wind 5 m/s · clouds 66%

Wednesday9 September 2026

🌧️31°moderate rain

sunrise 05:54 · sunset 18:11 · night 26° · evening 27° · rain 8.58 mm · humidity 62% · wind 4 m/s · clouds 100%

Thursday10 September 2026

🌧️30°moderate rain

sunrise 05:54 · sunset 18:10 · night 26° · evening 26° · rain 10.74 mm · humidity 67% · wind 3 m/s · clouds 92%

Friday11 September 2026

🌧️30°moderate rain

sunrise 05:54 · sunset 18:09 · night 26° · evening 26° · rain 14.97 mm · humidity 66% · wind 5 m/s · clouds 100%

Saturday12 September 2026

🌧️25°moderate rain

sunrise 05:54 · sunset 18:08 · night 24° · evening 24° · rain 24.69 mm · humidity 85% · wind 7 m/s · clouds 100%

Sunday13 September 2026

🌧️25°moderate rain

sunrise 05:54 · sunset 18:08 · night 24° · evening 24° · rain 21.78 mm · humidity 92% · wind 5 m/s · clouds 100%

Monday14 September 2026

🌧️24°moderate rain

sunrise 05:54 · sunset 18:07 · night 24° · evening 24° · rain 42.57 mm · humidity 96% · wind 4 m/s · clouds 100%

Tuesday15 September 2026

🌧️29°moderate rain

sunrise 05:54 · sunset 18:06 · night 25° · evening 25° · rain 20.04 mm · humidity 73% · wind 4 m/s · clouds 94%

Wednesday16 September 2026

🌧️28°moderate rain

sunrise 05:54 · sunset 18:06 · night 25° · evening 29° · rain 16.71 mm · humidity 76% · wind 6 m/s · clouds 95%

Thursday17 September 2026

🌧️25°moderate rain

sunrise 05:54 · sunset 18:05 · night 24° · evening 24° · rain 12.48 mm · humidity 87% · wind 6 m/s · clouds 100%

Friday18 September 2026

🌧️27°light rain

sunrise 05:54 · sunset 18:04 · night 25° · evening 28° · rain 5.01 mm · humidity 78% · wind 4 m/s · clouds 93%

Saturday19 September 2026

🌧️29°light rain

sunrise 05:54 · sunset 18:03 · night 26° · evening 26° · rain 4.41 mm · humidity 73% · wind 5 m/s · clouds 75%

Sunday20 September 2026

🌧️25°light rain

sunrise 05:54 · sunset 18:03 · night 25° · evening 26° · rain 5.91 mm · humidity 92% · wind 3 m/s · clouds 100%

UV index in Siem Reap - is it safe to sunbathe?

Today the UV index in Siem Reap is 8 (very high) - unprotected fair skin can burn in about 25 minutes. SPF 50, long sleeves and shade between 10:00 and 16:00.

Siem Reap weather through the year

Warmest, driest months on average: January, February, November, December.

Nearby and related places

BattambangSisŏphŏnSihanoukvillePrey VêngPhnom PenhKoh Kong

FAQ - Siem Reap weather

What is the weather like in Siem Reap today?

Today it is about 31° during the day and 27° at night, light rain.

How far ahead can I check the forecast for Siem Reap?

This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.