Siem Reap (Angkor) weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Poor
Best time to visit: December – February
What is the weather like in Siem Reap (Angkor) in September?
In September, Siem Reap (Angkor) is hot: daytime highs average 30 °C, and even at night it stays warm at around 25 °C. Expect around 5 hours of sunshine a day. It is the rainy season: rain falls on about 27 days, totalling 291 mm. On about 18 days the thermometer climbs to 30 °C or more. The air is often humid and muggy. All in all, September is not an ideal month for a holiday in Siem Reap (Angkor).
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 33 | 37 | 42 |
| Day | 31° | 30° | 30° |
| Night | 26° | 25° | 24° |
| Sun | 6 h | 5 h | 6 h |
| Rain days | 25 | 27 | 24 |
More details for September
- Daylight
- 12 h 13 min05:53 – 18:07
- UV index
- 13 · extremeclear sky, noon (estimate)All months
- Muggy days
- 30 daysdew point 18 °C or more
- Wind
- 13 km/haverage daily peak
- Cloud cover
- 90 %on average
- Hot days
- 18 days30 °C or more
- Time zone
- UTC+7Asia/Phnom_Penh
How the score comes together
- Temperatureweight 50 %60 %
- Sunshineweight 20 %33 %
- Few rainy daysweight 30 %0 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- Sunglasses & sun hat
- Light, breathable clothes
- Water bottle – drink plenty
- Insect repellent
- Rain jacket or umbrella
Siem Reap (Angkor) in September: quick answers
Is Siem Reap (Angkor) hot in September?
Yes. In September, Siem Reap (Angkor) is hot: daytime highs average 30 °C and nights stay around 25 °C. On about 18 days the thermometer climbs to 30 °C or more.
Does it rain much in Siem Reap (Angkor) in September?
It rains often – on about 27 days, adding up to 291 mm.
Siem Reap (Angkor) month by month
The whole year in Siem Reap (Angkor)All destinations: CambodiaWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, GeoNames (CC BY 4.0)