Koh Samui Weather Forecast
Koh Samui weather: 80°F, overcast. Hourly forecast, 14-day outlook, UV, air quality and the best time to visit.
7-day forecast for Koh Samui
Daily highs and lows, precipitation and UV.
| Day | Conditions | High / Low | Precip | Wind | UV |
|---|---|---|---|---|---|
| Wed, Aug 26 | 🌦️ Light drizzle | 84° / 76° | 69% · 0,0 in | 15 mph | 9 |
| Thu, Aug 27 | 🌦️ Light showers | 86° / 75° | 84% · 0,1 in | 14 mph | 9 |
| Fri, Aug 28 | ⛈️ Thunderstorm | 83° / 73° | 90% · 0,3 in | 14 mph | 9 |
| Sat, Aug 29 | 🌦️ Light showers | 81° / 73° | 75% · 0,2 in | 13 mph | 7 |
| Sun, Aug 30 | 🌦️ Drizzle | 80° / 73° | 80% · 0,3 in | 15 mph | 6 |
| Mon, Aug 31 | 🌦️ Drizzle | 80° / 73° | 71% · 0,2 in | 13 mph | 7 |
| Tue, Sep 1 | ⛈️ Thunderstorm | 83° / 74° | 56% · 0,1 in | 12 mph | 8 |
Weekend outlook
🌦️ 81° / 73°
Light showers · 75% rain · wind 13 mph
🌦️ 80° / 73°
Drizzle · 80% rain · wind 15 mph
Is today a good day to visit?
Activity scores from 0 to 10 based on temperature, rain, wind, sun and visibility.
What to pack, what to skip
- Lightweight, light-coloured clothing and a refillable water bottle
- Sunglasses, a brimmed hat and SPF 30+
- A packable rain shell - 7 of the next 7 days carry a real chance of rain
- Avoid exposed ridgelines, small boats and rooftop viewpoints while gusts stay above 39 mph.
- If your dates are flexible, avoid October, November and December - historically the least comfortable months here.
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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Weather for related places
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 80°F (26°C) with overcast. Humidity is 74% and wind is 11 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 2:04 PM.
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.
Related articles
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 26, 2026 at 2:04 PM local time. Live blocks refresh every 15 minutes; climate averages monthly.
