Season guide · Koh Samui · Thailand
Koh Samui in the hot, mostly dry season
May–August: weather, crowds, prices and the best things to do this time of year.
Updated By the AMZBooking editorial team
Photo: Abrget47j, CC BY-SA 3.0
Quick answer
Warm seas and short showers; busy in July and August with summer holidays, good value in May and June. Expect highs up to 33°C (91°F) and lows around 25°C (77°F), with about 47 rainy days across May–August. June–August are among the best months of the year to visit.
Key facts
- Months
- May–August
- Temperatures
- 25°C (77°F) to 33°C (91°F)
- Rainy days in the season
- About 47
- Sea
- 29°C (84°F) to 30°C (86°F)
- Crowds
- Busy
- Hotel prices
- High
Weather in the hot, mostly dry season
| Month | High | Low | Rainy days | Daylight | Crowds |
|---|---|---|---|---|---|
| May | 33°C (91°F) | 25°C (77°F) | 12 | 12.6 h | 3/5 |
| June | 32°C (90°F) | 25°C (77°F) | 11 | 12.7 h | 3/5 |
| July | 32°C (90°F) | 25°C (77°F) | 12 | 12.6 h | 4/5 |
| August | 32°C (90°F) | 25°C (77°F) | 12 | 12.4 h | 5/5 |
Compared with the rest of the year: average highs of 32°C (90°F) against a yearly 31°C (88°F), and 47 of the year's roughly 142 rainy days fall in these 4 months. Crowds rate 4/5 and hotel prices 4/5 on average.
Good choices for the hot, mostly dry season
Experience · Chaweng
Thai cooking class
Book a morning class with a market visit so you learn about southern Thai ingredients such as fresh turmeric.
- Time needed
- Half a day
- Cost
- Mid-priced
- Food
- Kids
- Rainy day
- Couples
Experience · Chaweng
Muay Thai fight night
Stadiums in Chaweng and Lamai stage regular bouts of Thailand's national sport, with traditional music and pre-fight rituals, from local youngsters to experienced fighters.
- Time needed
- 2–3 hours
- Cost
- Mid-priced
- After dark
- Rainy day
- Active
Day trips in the hot, mostly dry season
- Koh Phangan (About 20–40 minutes by boat) — Samui's neighbour has quieter beaches such as Thong Nai Pan and Bottle Beach, jungle waterfalls and Haad Rin, home of the monthly Full Moon Party.
- Koh Tao and Koh Nang Yuan (About 1.5–2 hours by high-speed boat) — Koh Tao is one of the world's busiest places to learn to dive, with clear water and coral reefs.
What to pack
- Light, breathable clothes, a sun hat and high-factor sunscreen
- A compact umbrella and waterproof shoes — rain is frequent
- Comfortable walking shoes
Other times of year
Questions travellers ask
+Is the hot, mostly dry season a good time to visit Koh Samui?
Yes: June–August are among the best months. Warm seas and short showers; busy in July and August with summer holidays, good value in May and June.
+What is the weather like in Koh Samui in the hot, mostly dry season?
Highs of up to 33°C (91°F) and lows around 25°C (77°F), with about 47 rainy days over the season.