Kep weather in September
September in Kep: sweltering, soaked, with clean air — a gamble, with 27 rainy days.
Updated September 2026 · climate normals from ERA5 reanalysis
#12 of 12 months in Kep · #1181 of 1413 destinations to visit in September · comfort 57/100 (tier D)
- Days
- 29°C
- Nights
- 25°C
- Wet days
- 27
- Sun
- 7.6 h
- Humidity
- 86%
- Daylight
- 12 h

Traveller notes on Kep in September
Other months in Kep
Cambodia forum threads are consistent that January sits squarely in the dry season here - lower temperatures, much lower humidity than the wetter months, and genuinely pleasant conditions extending from the November/December stretch through January. One visitor specifically mentioned swimming at Angkoul Beach in January with fine water quality despite the beach itself not being pristine. Kep's famous crab market was the other recurring highlight, with regulars recommending buying fresh crab straight from vendors who'll cook it to order with Kampot pepper. One seasonal note worth knowing: the region's solar salt fields, a nearby attraction, only work and look their best in dry season - during the wet months they're just flooded fields.
Forum posters describe February as a good time to visit Cambodia generally - somewhat cooler than the peak heat ahead but already warming up, and noticeably drier, with leaves dropping from trees and rice fields mostly harvested and dry. Posters do flag genuine dust as a byproduct of this dry stretch. Even within the broader November-February dry season, posters describe a common daily pattern of a sunny, pleasant morning giving way to more cloud by late afternoon, with a real chance of a passing shower or brief thunderstorm by evening - Cambodia's tropical climate means even the dry season isn't fully rain-free. Posters generally pair a Kep visit with nearby Kampot, treating the two coastal towns as a natural combination.
Add your own note from Kep's card on the map.
Kep climate normals — September
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 January–March.
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 289 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: sweltering, 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 288.6 mm of rain over roughly 27.1 rainy days.
- What is the air quality in Kep in September?
- Kep has a mean US Air Quality Index of about 31 in 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.