i
Photo by User: (WT-shared) Wipkinger at wts wikivoyage, Public domain, via Wikimedia Commons.
Ko Samui in September
sweet spot · one of the best months to go
The year in Ko Samui
Tap a month for its page
- JanJKo Samui in January: ok, busy
- FebFKo Samui in February: good, busy
- MarMKo Samui in March: good, busy
- AprAKo Samui in April: good
- MayMKo Samui in May: ok
- JunJKo Samui in June: sweet spot
- JulJKo Samui in July: sweet spot
- AugAKo Samui in August: sweet spot
- SepSKo Samui in September: sweet spot
- OctOKo Samui in October: avoid
- NovNKo Samui in November: avoid
- DecDKo Samui in December: ok, busy
- Sweet spot
- Good
- OK
- Avoid
- Busy
Plan this trip
Each site opens on its own search: choose your dates there. A few open on their home page, where you type the place too.
Links marked Ad pay us a commission if you book, at no extra cost to you; most pay nothing, and what a site pays never decides whether it is listed or where. How we rank
Flights from
Flights
Your city is a guess from your time zone. Choose your city
Where are you flying from? Choose your city for its flights and fares.
Book with the airline
Where to stay
Book direct
Luxury
Things to do
Car hire
Travel insurance
Check whether your bank card or home insurance already covers this trip.
If the trip needs a visa, the travel agent or visa centre usually sells the cover it asks for.
Mobile data (eSIM)
Your own plan's EU roaming may already cover this.
Renting a pocket Wi-Fi is the other common way to stay connected.
These are sites people in book with. Each opens in a new tab, on the site's own pages.
The numbers
| Daily high | 30°C |
|---|---|
| Nightly low | 25°C |
| Feels like, afternoon | 35°C |
| Rainy days, 1 mm or more | 9 · 141 mm |
| Humidity | 80% |
| Sunshine | 8.9 h/day |
| Daylight | 12.2 h/day |
| Beach and sea | 21 of 30 days dry and 23–35 °C; sea not measured |
| Crowds | 100 / 100, higher is quieter |
Ten-year averages for this calendar month. A rainy day is one with at least 1 mm of rain, as a weather station counts it. The model these figures come from drizzles more than a rain gauge, the more so the warmer the month, so its days count from 2 mm, rising to 5 mm in the hottest.
Weather read at Chaweng Beach: ten years of ERA5 and ERA5-Land reanalysis, through Open-Meteo's open data.
How busy it gets
Ko Samui in pictures
i
Renek78, CC BY-SA 4.0, via Wikimedia Commons
i
Abrget47j, CC BY-SA 3.0, via Wikimedia Commons
i
Ruta Badina, CC BY-SA 3.0, via Wikimedia Commons
What to pack
- Summer clothes by day, highs around 30°C.
- A packable rain jacket for the 9 or so rainy days.
- Sun protection: about 9 hours of sunshine a day.
- Humidity averages 80%; breathable fabrics dry faster.
Each line is a threshold over the ten-year figures above, not advice from anywhere else.
Before you go
Type A and B and C and F plugs at 220 V. Drives on the left. The currency is the Baht. UK Foreign Office: avoid all but essential travel to parts. Global Affairs Canada: Exercise a high degree of caution (with regional advisories). US State Department: Level 1: Exercise Normal Precautions. Everything for Thailand: cost of living, languages, emergency numbers and health.
On arrival in Ko Samui: the apps, paying, getting around, tipping and the emergency numbers.
September elsewhere
In September from
The other months at Ko Samui
Links marked Ad pay us a commission if you book through one, at no extra cost to you. That does not affect the numbers on this page, which are computed before any link is built.