Koh Samui weather in August
Monthly temperatures, rain, humidity, what to wear and what to pack — 2024–2025 historical average
Koh Samui August weather at a glance
In August, Koh Samui averages 24.9°C, with typical highs of 27.6°C and lows of 22.6°C. The historical average is 24 wet days and 79% humidity.
Koh Samui August temperature & humidity
Koh Samui August rain & wet days
Pack a light rain jacket, waterproof pouch and quick-dry shoes. Keep an indoor stop available between outdoor activities.
What to wear in Koh Samui in August
Choose breathable summer clothes and pack sun protection. Rain is frequent at roughly 24 days in the month; pack a rain jacket and water-resistant shoes.
- DaytimeBreathable short sleeves, hat and sunscreen · average high 27.6°C
- Morning & eveningLight layer for air-conditioned rooms · average low 22.6°C
- FootwearComfortable walking shoes; quick-dry footwear for rainy days.
Packing essentials
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Koh Samui August sunrise & sunset times
2026 August · Local time (Asia/Bangkok)
| Date | Sunrise | Sunset | Daylight |
|---|---|---|---|
| 2026-08-01 | 06:10 | 18:42 | 12h 32m |
| 2026-08-15 | 06:11 | 18:38 | 12h 26m |
| 2026-08-31 | 06:11 | 18:29 | 12h 18m |
For sunset photos, arrive before the listed sunset time. Clouds, mountains and buildings can change when the sun becomes visible or disappears.
Calculated for the city coordinates with daylight saving applied. SunCalc · tz-lookup
Koh Samui travel updates
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Koh Samui rainy season & dry season
Is August wet or dry?
Thailand’s southwest monsoon generally brings rain from mid-May to mid-October. The southern east coast also receives northeast-monsoon rain, so Koh Samui and Phuket do not share one wet/dry-season calendar. The 2024–2025 average for August is 24 wet days.
2024–2025 wet-day averages, not long-term season boundaries. Wet days do not mean all-day rain.
Packing for rainy and dry periods
For rainy periods, bring a light rain jacket, a waterproof pouch and quick-dry clothes. In drier months, pack sunscreen and a hat, plus a compact umbrella for showers. For beach trips, check the boat operator’s weather and cancellation notices.
Season guide: Thailand Government
Koh Samui travel essentials
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Best months to visit Koh Samui
Bar height shows our simple weather-comfort score, not a safety rating; colour shows temperature.
August weather by year
Daily weather in 2025
Daily high and low temperatures; blue labels show precipitation
Frequently asked questions
What is Koh Samui weather like in August?
In August, Koh Samui averages 24.9°C, with typical highs of 27.6°C and lows of 22.6°C. The historical average is 24 wet days and 79% humidity. Our weather-comfort rating for this month is challenging.
Does it rain a lot in Koh Samui in August?
There are about 24 wet days in August. Pack a rain jacket and water-resistant shoes.
What should I wear in Koh Samui in August?
Choose breathable summer clothes and pack sun protection. Rain is frequent at roughly 24 days in the month; pack a rain jacket and water-resistant shoes.
What are the best months to visit Koh Samui?
Recent weather data rates March among the more comfortable months.
Where can I check Koh Samui weather in August in real time?
Check local webcams for the view right now and a local weather service for today’s forecast. Monthly temperatures here are historical averages.
Is August rainy or dry season in Koh Samui?
Thailand’s southwest monsoon generally brings rain from mid-May to mid-October. The southern east coast also receives northeast-monsoon rain, so Koh Samui and Phuket do not share one wet/dry-season calendar. The 2024–2025 average for August is 24 wet days.
Which months have fewer rainy days in Koh Samui?
In our 2024–2025 data, March, April, February have the fewest wet days. These are recent observations, not long-term climate normals. Compare temperatures and your planned activities as well.
What time are sunrise and sunset in Koh Samui in August?
On 2026-08-15, calculated sunrise is 06:11 and sunset is 18:38 in local time (Asia/Bangkok). Times vary by date and terrain.
Koh Samui weather by month
More Southeast Asia destinations in August
Open-Meteo (CC BY 4.0) · 2024–2025 historical data, aggregated and rounded by this site. Not a forecast or long-term climate normal. Calculation method and limitations