SeasonMapKep weather in September
Cambodia
September in Kep: warm, soaked, with clean air — a gamble, with 27 rainy days.
#12 of 12 months in Kep · #1181 of 1383 destinations to visit in September · comfort 57/100 (tier D)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Kep in September
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Kep climate normals — September
| Daytime high | 29°C / 84°F | 🌤 warm |
|---|---|---|
| Nighttime low | 25°C / 78°F | |
| Sea temperature | 29°C / 84°F | ♨️ bath-warm |
| Rainfall | 305 mm / 12 in | ⛈ soaked |
| Rainy days | 27 days | |
| Humidity | 87% | 💦 very humid |
| Dew point | 24°C / 76°F | |
| Sunshine | 7.6 h/day | |
| Daylight | 12.2 h | |
| Wind | 20 km/h / 12 mph | |
| Air quality (US AQI) | 31 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Kep in September
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusyPchum Ben, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Kep's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherKep's weather peaks December–February.
Best weatherFair weatherToughest weather
What's on in Kep in September
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Season
Southwest monsoon quiet
1 Jun – 30 Sep · usuallyThe wet months are Kep's cheapest and emptiest, with afternoon storms rather than all-day rain and a boat to Rabbit Island that runs when the sea allows rather than when the timetable says.
- Holiday
Pchum Ben
15 Sep – 15 Oct · usuallyNational holidayClosuresFifteen days of offerings to the dead ending in three public holidays, when Khmer staff go back to their home provinces and small guesthouses and kitchens simply shut. Source ↗
- Season
Wet season
MonsoonRisk27 rainy days and about 305 mm in the month — the real kind of rainy season, not afternoon showers.
from the climate normals
Nearby, and something's on
Within 300 km of Kep — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Kep?
Kep in September — FAQ
- Is September a good time to visit Kep?
- September in Kep: warm, soaked, with clean air — a gamble, with 27 rainy days. It ranks #12 of 12 months for Kep on SeasonMap's comfort score (57/100).
- What is the weather like in Kep in September?
- In September, Kep averages a daily high of 28.9°C and a low of 25.4°C, with about 305.3 mm of rain over roughly 27 rainy days.
- What is the air quality in Kep in September?
- Kep has a mean US Air Quality Index of about 31 in September.
Other months in Kep
Compare Kep in September
Warmer or cooler than Kep in September
Similar destinations in Southeast Asia — September
Within 300 km: Phnom Penh's Pchum Ben around 10 Sep – 10 Oct, and Ho Chi Minh City's Mid-Autumn Festival on 25 Sep.