Season guide · Koh Samui · Thailand
Koh Samui in the transition
September: weather, crowds, prices and the best things to do this time of year.
Updated By the AMZBooking editorial team
Photo: Gunther Dihlmann, CC BY-SA 3.0
Quick answer
More frequent showers and fewer visitors; a quiet month with lower rates. Expect highs up to 32°C (90°F) and lows around 24°C (75°F), with about 14 rainy days across September.
Key facts
- Months
- September
- Temperatures
- 24°C (75°F) to 32°C (90°F)
- Rainy days in the season
- About 14
- Sea
- 29°C (84°F) to 29°C (84°F)
- Crowds
- Quiet
- Hotel prices
- Low
Weather in the transition
| Month | High | Low | Rainy days | Daylight | Crowds |
|---|---|---|---|---|---|
| September | 32°C (90°F) | 24°C (75°F) | 14 | 12.2 h | 2/5 |
Compared with the rest of the year: average highs of 32°C (90°F) against a yearly 31°C (88°F), and 14 of the year's roughly 142 rainy days fall in these 1 months. Crowds rate 2/5 and hotel prices 2/5 on average.
Good choices for the transition
Experience · Chaweng
Thai cooking class
Several cooking schools in Chaweng, Lamai and Bophut run half-day classes covering curries, tom yum, pad thai and desserts, often starting with a visit to a local market.
- Time needed
- Half a day
- Cost
- Mid-priced
- Food
- Kids
- Rainy day
- Couples
Experience · Chaweng
Muay Thai fight night
Ringside seats are pricier but give a much better view of the rituals before each bout.
- Time needed
- 2–3 hours
- Cost
- Mid-priced
- After dark
- Rainy day
- Active
Day trips in the transition
- Koh Tao and Koh Nang Yuan (About 1.5–2 hours by high-speed boat) — Koh Tao is one of the world's busiest places to learn to dive, with clear water and coral reefs.
- Koh Tan and Koh Madsum (About 20–30 minutes by longtail) — Two small islands off Samui's south coast with calm, shallow snorkelling reefs, quiet beaches and simple seafood restaurants.
What to pack
- Light, breathable clothes, a sun hat and high-factor sunscreen
- A compact umbrella and waterproof shoes — rain is frequent
- Comfortable walking shoes
Other times of year
Questions travellers ask
+Is the transition a good time to visit Koh Samui?
It is a trade-off: More frequent showers and fewer visitors; a quiet month with lower rates. The best months overall are February–April and June–August.
+What is the weather like in Koh Samui in the transition?
Highs of up to 32°C (90°F) and lows around 24°C (75°F), with about 14 rainy days over the season.