September · Cambodia
Best time to visit Sihanoukville in September Weather, crowds & prices
Weather in Sihanoukville in September
Average temperature 28°C, 464 mm of rain, about 12 days with 6+ hours of sunshine and 86% humidity — based on the five most recent complete years of ERA5 data (2021–2025).
September score
4.8/10
Ranked #12 of 12 months
- Avg temp
- 28°C
- Rainfall
- 464 mm
- Humidity
- 86%
- Days with 6h+ sun
- 12
- Crowd Density
- Quiet / Uncrowded
- Average Expenses
- $ · Budget Friendly ($)
September in Sihanoukville scores 4.8/10 for beach and coastal travel - ranked #12 of 12. Expect around 28°C, 464 mm of rain, and roughly 12 days with 6+ hours of sunshine this month.
Sihanoukville is Cambodia's beach and ferry hub for the southern islands.
September in Sihanoukville — the hardest end of the year
September averages 28°C (82°F) and humidity near 86%, so the practical pattern is early mornings, a long midday break, and evenings back outside.
464 mm of rain puts this in monsoon territory — about 12 days with 6+ hours of sunshine across the whole month, and multi-day washouts are normal.
It scores 4.8/10 here, 12th of 12 months, against 9.8/10 in the destination's best month.
Pack the lightest breathable clothing you own, a hat, and more water than feels necessary, a proper rain shell rather than an umbrella.
Figure on low-season pricing, with crowds are light for this destination.
Flexible dates? February scores 5 points higher here — enough to change the trip.
Frequently asked
- What is the weather like in Sihanoukville in September?
- In September, Sihanoukville averages 28°C, 464 mm of rain, and about 12 days with 6+ hours of sunshine. Its climate-comfort score is 4.8/10.
- Is September a good time to visit Sihanoukville?
- September earns a 4.8/10 climate-comfort score. Use the year-round chart to weigh the weather against your budget and crowd preferences.
- How much does it rain in Sihanoukville in September?
- Expect about 464 mm of rain in September. Average humidity is 86% and there are about 12 days with 6+ hours of sunshine.
Curated in Sihanoukville
Tickets & experiences
Things to do in Sihanoukville
Sihanoukville, Cambodia. Live activities and tours from GetYourGuide, matched to this destination.