20-Year Climate Average
Koh Samui, Surat Thani, Thailand Weather in March
Normal High
80°F
Normal Low
74°F
Rainy Days
~16 of the month
Chance of Rain
50%
Humidity
76%
UV index
Not available
Daylight
12.1 hours
Peak wind
11 mph
Usually good for: beaches and outdoor dining.
Based on March climate records from 2006–2025 (Open-Meteo Historical Weather Archive). These are planning averages, not a forecast. Data: Open-Meteo.com, CC BY 4.0.
Current conditions
Forecast versus the climate baseline
84°F
It currently feels like 93°F with 62% humidity, a 69°F dew point and 3 mph wind. Climate averages describe the month; this live reading is what matters for plans today.
84° / 74° · 97% rain
80° / 71° · 100% rain
80° / 72° · 99% rain
Best Months to Visit Koh Samui, Surat Thani, Thailand
Ranked by historical rainy-day frequency — the driest months over the past 20 years.
Methodology
Monthly values use the 2001–2020 observation period. Temperature, precipitation, humidity or dew point, wind, UV and daylight are shown only when the selected source provides them; unavailable fields are never estimated or silently replaced. These are planning normals, not guarantees for a specific trip.
What is the weather like in Koh Samui, Surat Thani, Thailand in March?
The 20-year average high in Koh Samui, Surat Thani, Thailand in March is 80°F, with a low around 74°F and about 16 rainy days.