Thailand (Koh Samui) · May
Low seasonThailand · Asia
Climate Overview
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
MAXMAX | 31° | 31° | 32° | 33° | 34° | 33° | 33° | 33° | 33° | 32° | 31° | 31° |
MINMIN | 26° | 26° | 27° | 27° | 27° | 27° | 27° | 27° | 27° | 26° | 26° | 26° |
☀️Sunshine | 8h UV 8 | 9h UV 9 | 10h UV 9 | 9h UV 9 | 8h UV 9 | 8h UV 8 | 7h UV 8 | 8h UV 8 | 6h UV 8 | 6h UV 7 | 6h UV 7 | 7h UV 7 |
🌊Water Temp | 28° | 29° | 30° | 31° | 31° | 30° | 30° | 30° | 30° | 30° | 29° | 28° |
🌧Rain Days | 8d154mm | 4d66mm | 4d112mm | 6d101mm | 11d152mm | 10d120mm | 11d142mm | 8d95mm | 11d122mm | 15d239mm | 16d474mm | 11d310mm |
Best travel time current monthMonthly averages 2005–2025 · Source: ERA5 + station data
Post-season — prices falling after the travel period, beaches and attractions quieter.
May in Thailand (Koh Samui) is generally manageable, but with 11 rain days it's not a reliably sunny month. Better conditions can be found in February, March, April, and August.
Daytime highs reach 33°C with a daily average of 30°C — nights stay warm at 27°C. The sun shines an average of 8 hours per day; there are 11 rain days with 152 mm total. The water is a warm 31°C — perfect for snorkelling and swimming.
A jacket for cool evenings should not be left behind. Sightseeing and excursions can be enjoyed at this time of year without the heat.
Events & Festivals
- Samui Regattavariabel (Ende Mai, 8 Tage)
Asiens renommierteste Segelregatta vor Chaweng Beach. Jachten aus aller Welt messen sich über mehrere Renntage; abends gibt es Sundowner-Partys an den Stränden. Die Veranstaltung zählt zur internationalen Segelrennkalender.
Packing list for Thailand (Koh Samui) in May
- Luftige Kleidung aus Leinen oder Baumwolle
- Leichte Abendkleidung
- Badezeug und Strandtuch
- Sonnencreme LSF 50
- Sonnenbrille
- Sonnenhut
- Leichter Regenschirm oder Regenponcho
- Insektenschutzmittel
- Reiseapotheke
Frequently Asked Questions
- Is May a good time to visit Thailand (Koh Samui)?
- May is not an optimal month for Thailand (Koh Samui) (Score: 67/100), but it is manageable. For better conditions, consider February, March, April, and August.
- How warm is it in Thailand (Koh Samui) in May?
- In May, Thailand (Koh Samui) sees daily highs of 33°C. Nights cool to 27°C, with a daily average of 30°C.
- How much rain falls in Thailand (Koh Samui) in May?
- In May, Thailand (Koh Samui) receives an average of 152 mm of rain over 11 rain days. An umbrella may occasionally be needed.
- How many sunshine hours does Thailand (Koh Samui) get in May?
- Thailand (Koh Samui) averages 8 sunshine hours per day in May — above the annual average.
- How warm is the water in Thailand (Koh Samui) in May?
- Water temperature in Thailand (Koh Samui) in May averages 31°C — ideal for swimming and snorkelling.
