Ko Samui Weather in September
Thailand · 30-year monthly averages
🤔 Fair time to visit
September in Ko Samui is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (77°F). Expect roughly 118mm of precipitation spread over about 11 rainy days, and this is one of the wetter months.
Avg high
32°C
89°F
Avg low
25°C
77°F
Rainfall
118mm
rainy
Rainy days
11
days with ≥1mm
🎒 What to pack
- breathable summer clothing
- sunscreen, hat and sunglasses
- refillable water bottle
- compact umbrella or rain jacket
September vs the rest of the year
FAQ
- How hot is Ko Samui in September?
- September in Ko Samui is hot, with average daytime highs around 32°C (89°F) and nighttime lows near 25°C (77°F). Expect roughly 118mm of precipitation spread over about 11 rainy days, and this is one of the wetter months.
- Does it rain a lot in Ko Samui in September?
- Ko Samui sees around 118mm of precipitation in September on average — rainy by global standards.
- Is September a good time to visit Ko Samui?
- September is a workable month to visit Ko Samui, but expect some weather trade-offs.