Koh Samui Weather Forecast
Koh Samui weather: 79°F, partly cloudy. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
Next 48 hours
Hour-by-hour temperature, precipitation chance and wind.
Best time to go outside today
7 AM - 10 AM · comfort score 7.7/10
The best window to be outside is roughly 7 AM to 10 AM, when temperature, rain chance and wind line up best.
Weather in Koh Samui right now
Wear sunglasses and use SPF 30+ if you are outside for long.
Source: Open-Meteo. Updated 10:02 AM, Aug 25 local time.
Active alerts for Koh Samui
Derived from the forecast. No official alert feed is wired for this country yet.
See the Koh Samui forecast by time range
Koh Samui weather - more answers
Explore Koh Samui
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Frequently asked questions
Where is Koh Samui?
Koh Samui is an island in Thailand. Its coordinates are 9.512, 100.0136. It lies in Asia.
What is the weather like in Koh Samui right now?
It is currently 79°F (26°C) with partly cloudy. Humidity is 78% and wind is 10 mph.
When is the best time to visit Koh Samui?
January, February, March and April offer the most comfortable conditions in Koh Samui, which has a temperate climate. October, November and December are usually the hardest months for outdoor plans.
What time zone is Koh Samui in?
Koh Samui observes Asia/Bangkok (UTC+07:00). The local time is 10:02 AM.
What is the nearest airport to Koh Samui?
The closest airports are Phuket International Airport (HKT), 151 mi away and Suvarnabhumi Airport (BKK), 293 mi away.
What are the top things to do in Koh Samui?
Popular options include Khao Sok National Park, Railay Beach, Maya Bay, Phuket and Langkawi.
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Data sources and methodology
| Place data | USPOTUS Atlas dataset (islands) - coordinates, hierarchy and facts. |
|---|---|
| Forecast and observations | Open-Meteo (ECMWF and national models). |
| Air quality and pollen | Copernicus CAMS via Open-Meteo. US AQI scale. |
| Climate averages | ERA5 reanalysis via the Open-Meteo archive, aggregated over 3 years. |
| Method | Scores, comparisons and advice on this page are computed from the inputs above. Distances are straight-line. Nothing is estimated where data is missing - the block is simply not shown. |
Last updated August 25, 2026 at 10:02 AM local time. Live blocks refresh every 15 minutes; climate averages monthly.
