Koh Samet Weather in May
Koh Samet in May sees very high temperatures, with highs around 31°C (88°F) and overnight lows of 27°C (81°F). With the rainy season in full effect, expect around 287 mm (11 in) of rainfall and regular showers throughout the month.
Rainfall in Koh Samet in May
Koh Samet is in the rainy season in May, with rain on around 16 days and an average of 287 mm (11 in). Showers during the rainy season tend to be heavy and can come down intensely. An umbrella is often not enough, so a poncho or waterproof jacket is a better choice.
Temperature in Koh Samet in May
If you're visiting Koh Samet in May, expect highs of 31°C (88°F) and overnight lows around 27°C (81°F). The hottest part of the day is usually in the afternoon, so lighter clothing can help you stay comfortable. With lows of 27°C (81°F), it stays warm throughout the night. A cold shower before going to sleep is one of the easiest ways to cool down before bed.
Sunshine in Koh Samet in May
The month brings about 156 hours of sunlight, offering a comfortable mix of sun and rainy moments.May in Koh Samet has its charm, but if you're looking for destinations with pleasant temperatures and sunny skies, our weather planner can help you explore other options in the world.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Thailand, check out our Koh Samet's climate page.
Koh Samet Temperature in May
Min Temperature
27°C (81°F)
Max Temperature
31°C (88°F)
Chance of Rain
53%
Precipitation
287 mm (11 in)
Rainy days
16 days
Humidity
78% *
Sunshine
156 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Koh Samet typically stay consistent throughout May, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 27°C (81°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather for Koh Samet in May
Browse day-by-day weather records for Koh Samet spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Koh Samet historical weather extremes in May
Based on 50 years of weather observations in Koh Samet between 1976 and 2026, these are the recorded extremes.
- Koh Samet recorded its highest May temperature of 39°C (102°F) on May 22, 1983.
- On May 21, 1976, Koh Samet saw its coldest May day with temperatures maxing out at 27°C (81°F).
- Nighttime temperatures dropped to 17°C (63°F) on May 15, 1982, marking the coldest May night on record.
Best Places in Thailand in May
Find out more about the weather in Thailand and which places have the best travel conditions in this month. See all of Thailand in May →
perfect weather
pleasant
tolerable
unpleasant
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What to Wear in Koh Samet in May
Warm weather calls for comfortable, breathable clothing in May. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Koh Samet in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Thailand, check out our Koh Samet's climate page.
Temperature Rainfall Sunshine Humidity
See the full Koh Samet climate overview or explore weather in Thailand.
