Thailand · Koh Phangan
Haad Than Sadet
Sea
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Air
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UV
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More like this
Climate · monthly averages
Sea temperature by month
30-year averages (1996–2025). Min/Max are typical daily lows and highs, not record extremes.
75°F
79°F
82°F
86°F
90°F
93°F
January
82.0°F(80°F–84°F)
February
82.9°F(81°F–84°F)
March
84.6°F(83°F–86°F)
April
86.5°F(85°F–88°F)
May
87.1°F(86°F–89°F)
June
86.2°F(85°F–87°F)
July
85.4°F(84°F–87°F)
August
84.9°F(84°F–86°F)
September
84.8°F(84°F–86°F)
October
84.6°F(83°F–85°F)
November
83.9°F(83°F–85°F)
December
82.5°F(81°F–84°F)
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MinMin °F | 8079.9 | 8181.5 | 8383.5 | 8585.4 | 8685.5 | 8584.8 | 8484.3 | 8483.9 | 8483.9 | 8383.4 | 8382.6 | 8180.8 |
| AvgAvg °F | 8282.0 | 8382.9 | 8584.6 | 8786.5 | 8787.1 | 8686.2 | 8585.4 | 8584.9 | 8584.8 | 8584.6 | 8483.9 | 8282.5 |
| MaxMax °F | 8484.0 | 8484.1 | 8685.6 | 8887.8 | 8988.6 | 8787.1 | 8786.6 | 8686.1 | 8685.7 | 8585.5 | 8585.0 | 8484.2 |
Warmest in May (87.1°F). Coldest in January (82.0°F). Comfortable for swimming year-round.
About Haad Than Sadet
Ko Pha-ngan sits in the Gulf of Thailand off Surat Thani, and its eastern jungle culminates in Than Sadet National Park, where boulders along the stream carry the royal initials Thai kings have carved since Rama V's 1888 visit. On the southern peninsula, Haad Rin draws thousands to its monthly Full Moon Party, while Haad Mae Haad on the northwest coast links to tiny Koh Ma by a tied-island sandbar at low tide. The sea stays at 28–29 °C year-round; Samui airport is a 30-minute ferry away.