Sihanoukville weather in September
September in Sihanoukville: warm, soaked, with clean air — a gamble, with 29 rainy days.
#12 of 12 months in Sihanoukville · #805 of 897 destinations to visit in September · comfort 59/100 (tier D)
Updated June 2026 · climate normals from ERA5 reanalysis
Traveller notes on Sihanoukville in September
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Sihanoukville climate normals — September
| Daytime high | 28°C / 83°F | 🌤 warm |
|---|---|---|
| Nighttime low | 25°C / 77°F | |
| Rainfall | 556 mm / 21.9 in | ⛈ soaked |
| Rainy days | 29 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 6.8 h/day | |
| Daylight | 12.2 h | |
| Wind | 13 km/h / 8 mph | |
| Air quality (US AQI) | 30 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Sihanoukville in September — FAQ
- Is September a good time to visit Sihanoukville?
- September in Sihanoukville: warm, soaked, with clean air — a gamble, with 29 rainy days. It ranks #12 of 12 months for Sihanoukville on SeasonMap's comfort score (59/100).
- What is the weather like in Sihanoukville in September?
- In September, Sihanoukville averages a daily high of 28.2°C and a low of 25.2°C, with about 555.5 mm of rain over roughly 29.4 rainy days.
- What is the air quality in Sihanoukville in September?
- Sihanoukville has a mean US Air Quality Index of about 30 in September.