Thailand Koh Samui Weather in June — Climate Guide
June in Koh Samui is high
Koh Samui Weather in June — Quick Answer
As of 2026- Avg temp
- 32° / 25°
- Rainfall
- 110mm · 13 days
- Crowds
- Busy
As of 2026, Koh Samui in June averages a high of 32°C and low of 25°C with 110mm of rain over about 13 days. A drier spell within the wet season — warm, often sunny, with passing showers. Around 32°C/25°C. Light clothing, swimwear, SPF 50+, and a light rain layer. Sea ~30°C.
June is high for Koh Samui.
June is the start of Koh Samui's second good season — the drier mid-year window of June to August that surprises many first-time visitors. It averages 32°C/25°C with relatively modest rainfall (around 110mm), often as brief showers.
Despite technically being within the wet season, June frequently delivers sunny days, calmer seas, and reliable boat trips to Ang Thong, Koh Phangan, and Koh Tao — making it one of the best-value times to visit, with good weather but fewer crowds and lower prices than the December-April peak.
Travel score
Koh Samui June Weather Stats
Avg High
32°C
Avg Low
25°C
Rainy Days
13
110mm total
Sunshine
7.5h
Daily avg
Humidity
78%
muggy
UV Index
11
Extreme
Wind
12 km/h
Gusts 22
Sea Temp
30°C
Avg water temp
Crowds
Busy
At attractions
June Sunrise & Sunset
Air Quality
PM2.5
13 μg/m³
PM10
24 μg/m³
Status
good
Feels-Like Temperature & Wind
Feels like
Daytime
38°C
Nighttime
27°C
Humidity and wind affect how the actual temperature feels.
Wind
12 km/h
Max gust 22 km/h
Activities Recommended for June
June Travel Pros & Cons
Pros
- Drier mid-year window — a second good season
- Good value — fewer crowds, lower prices than Dec-Apr
- Reliable boat-trip conditions return
- Opposite of rainy Andaman coast
Cons
- Still wet-season — passing showers possible
- High humidity
- European summer crowds building
- Conditions less certain than Feb-Mar
June Events & Festivals
- Drier mid-year window begins (Jun-Aug) — a second good season
- European summer-holiday visitors arrive
- Good boat-trip conditions return
- Often sunny with brief showers
Koh Samui in June — Full Picture
June is the start of Koh Samui's second good season — the drier mid-year window of June to August that surprises many first-time visitors. It averages 32°C/25°C with relatively modest rainfall (around 110mm), often as brief showers.
Despite technically being within the wet season, June frequently delivers sunny days, calmer seas, and reliable boat trips to Ang Thong, Koh Phangan, and Koh Tao — making it one of the best-value times to visit, with good weather but fewer crowds and lower prices than the December-April peak.
This is the classic 'best of both worlds' recommendation: fine weather and quieter beaches. European summer-holiday travelers start arriving, so beaches are livelier than May but not packed.
The Gulf timing is the whole point: while the Andaman coast (Phuket/Krabi) is in its rainy season, Samui enjoys a drier, sunnier mid-year spell — exactly the opposite.
The sea is warm (~30°C) and conditions are good for snorkeling and diving. UV stays high (11).
What to Wear & What to Pack
A drier spell within the wet season — warm, often sunny, with passing showers. Around 32°C/25°C. Light clothing, swimwear, SPF 50+, and a light rain layer. Sea ~30°C.
Packing Checklist
Seasonal Weather Overview
Spring (Mar·Apr·May)
31.7°C
25°C
10/mo
Summer (Jun·Jul·Aug)
Current32°C
25°C
13.3/mo
Autumn (Sep·Oct·Nov)
30°C
24.3°C
18/mo
Winter (Dec·Jan·Feb)
29°C
24°C
12.3/mo
Koh Samui Monthly Weather Comparison
| Month | High | Low | Rain | Sun | Humid | UV | Crowd | Price |
|---|---|---|---|---|---|---|---|---|
| 29° | 24° | 14d·180mm | 6.5h | 82% | 10 | Very busy | Peak | |
| February (Best) | 30° | 24° | 6d·60mm | 8h | 78% | 11 | Very busy | Peak |
| March (Best) | 31° | 25° | 7d·75mm | 8.5h | 78% | 12 | Busy | Peak |
| 32° | 25° | 9d·100mm | 8.5h | 78% | 12 | Busy | Peak | |
| 32° | 25° | 14d·150mm | 7h | 80% | 11 | Moderate | Shoulder | |
| 32° | 25° | 13d·110mm | 7.5h | 78% | 11 | Busy | Shoulder | |
| 32° | 25° | 13d·110mm | 7.5h | 78% | 11 | Very busy | Peak | |
| 32° | 25° | 14d·110mm | 7h | 78% | 11 | Very busy | Peak | |
| 31° | 25° | 15d·150mm | 6h | 80% | 10 | Moderate | Shoulder | |
| 30° | 24° | 19d·290mm | 5h | 84% | 9 | Quiet | Low season | |
| 29° | 24° | 20d·340mm | 4.5h | 85% | 9 | Quiet | Low season | |
| 28° | 24° | 17d·230mm | 5h | 84% | 9 | Very busy | Peak |
View Other Months
Koh Samui June Hotel Picks
Frequently Asked Questions
Is June a good time to visit Koh Samui?
Koh Samui in June is high. Tourist crowds are busy and flight/hotel prices are shoulder.
What's the average temperature in Koh Samui in June?
Koh Samui June averages a high of 32°C and a low of 25°C.
Does it rain much in Koh Samui in June?
Koh Samui June averages 110mm of rainfall over about 13 rainy days.
What should I wear in Koh Samui in June?
A drier spell within the wet season — warm, often sunny, with passing showers. Around 32°C/25°C. Light clothing, swimwear, SPF 50+, and a light rain layer. Sea ~30°C.
What time are sunrise and sunset in Koh Samui in June?
Koh Samui June sunrise is 06:00 and sunset is 18:40, with 12h 40min of daylight.
What's the air quality like in Koh Samui in June?
Koh Samui June air quality (AQI) averages 36, rated Good. PM2.5 averages 13μg/m³.
What activities are recommended in Koh Samui in June?
In June, Koh Samui is great for Ang Thong Marine Park (good conditions), Koh Tao diving & snorkeling, Beach days + island loop.
Is June peak season in Koh Samui?
Koh Samui June crowds are busy and prices are shoulder. Advance reservations are strongly recommended.
Best Months to Visit Koh Samui
View Other Months
Planning a June trip to Koh Samui?
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Why you can trust weather guide
Based in Chiang Mai for 8+ years, with 30+ countries visited across Southeast Asia, Japan, and Europe. Every detail in this guide is primary-source verified as of April 2026, with prices auto-refreshed via live exchange rate APIs. This isn't AI-generated boilerplate — it's written from the perspective of someone who has actually been there.