I was worried about the sea being clean since I heard July is the second season, but the sea around Koh Tao and Koh Nang Yuan was beautiful! Perhaps because it was a trip for two girls, a staff member accompanied us while we snorkeled, pointed out dangerous fish and other things, and made us feel safe swimming. We were also very happy that they took pictures for us. Lunch was delicious too. The boat had a roof at the back, but not at the front, and since it takes about an hour to get to Koh Tao, I recommend getting on early to get a seat in the shade. It was hot, but thankfully they provided plenty of bottled water.
Anonymous User
Friend
Surat Thani Weather, Climate and Best Time to Visit
Data source:Meteostat Update date:2025-09
Surat Thani year round climate
Spring (March–May): Average 83–85°F, hot and relatively dry with less rainfall. Common activities: Beach relaxation, temple visits, island exploration. Recommended clothing: Light and breathable clothing, sun hat, sunscreen.
Summer (June–August): Average 81–83°F, hot and humid with moderate rainfall. Common activities: Swimming, diving, snorkeling, enjoying island life. Recommended clothing: Light and breathable clothing, sandals, rain gear.
Autumn (September–November): Average 79–80°F, slightly lower temperatures with heavier rainfall, especially in October. Common activities: Visiting waterfalls, rainforest exploration (safety precautions necessary), enjoying relatively cooler weather. Recommended clothing: Light clothing, rain gear, non-slip shoes.
Winter (December–February): Average 78–81°F, warm weather with moderate rainfall. Common activities: Visiting national parks, exploring local markets, enjoying relatively comfortable weather. Recommended clothing: Light clothing, rain gear.
Surat Thani climatological average
Annual average temperature: approx. 81.9°F / Annual rainfall: approx. 2025 mm / Summer humidity: 75%–85% / Rainiest month: October
Surat Thani monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
80.2°F
86.9
February
81.3°F
83.2
March
83.5°F
64.3
April
85.8°F
88.6
May
84.4°F
131.2
June
83.1°F
127.1
July
81.7°F
164
August
82.6°F
110.3
September
81°F
192.2
October
80.4°F
489.7
November
79.5°F
194.1
December
79°F
293.9
Surat Thani weather for the next seven days
9/23
Wednesday
Light rain shower
79.1°F/75.3°F
9/24
Thursday
Overcast
77.5°F/75°F
9/25
Friday
Patchy rain nearby
79.8°F/74.8°F
9/26
Saturday
Light rain shower
79.8°F/76.1°F
9/27
Sunday
Patchy rain nearby
84.7°F/75.8°F
9/28
Monday
Light rain shower
83.8°F/75.9°F
9/29
Tuesday
Patchy rain nearby
87°F/76.8°F
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