Climate almanac
Ko Samui
Surat Thani, Thailand · 9.54°, 99.94°
What is the weather like in Ko Samui in September?
In September, Ko Samui is typically 83°F (29°C) during the day and 80°F (27°C) at night. The month brings about 5.8 in (147 mm) of precipitation in total.
- Average high83°F (29°C)
- Average low80°F (27°C)
- Precipitation5.8 in (147 mm)
- Clear or mostly clear days1
- Based on2016-2025 daily ERA5 reanalysis data (10-year normals)