Koh Samui Weather in April
April in Koh Samui sees daytime temperatures around 31°C (88°F) and lows of 28°C (82°F) at night. With around 106 mm (4.2 in) of rainfall expected, it's worth packing a rain jacket.
Rainfall in Koh Samui in April
Historically, approximately 8 days this month are expected to have rain, averaging 106 mm (4.2 in). Rainfall intensity is on the higher side this month. Expect more substantial showers rather than light, passing rain.
Temperature in Koh Samui in April
In April, Koh Samui sees very high temperatures, with highs of 31°C (88°F). Nights drop to around 28°C (82°F). If you're spending a lot of time outdoors, it helps to plan around the warmer part of the day. With overnight lows of 28°C (82°F), nights stay very warm. Air conditioning makes a real difference if you're sensitive to heat. A cold shower before bed can also help you get to sleep more comfortably.
Sunshine in Koh Samui in April
Expect a lot of sunshine this month, with about 201 hours of sun. These sunny conditions add to the overall experience.
Average water temperature in April
At 30°C (86°F), the water feels bath-warm. Fine for swimming, but those looking for a cooling swim may be a bit disappointed.Our weather planner can help you find worldwide destinations with pleasant weather during this period. January and February typically offer the best weather for Koh Samui.
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 Samui's climate page.
Koh Samui Temperature in April
Min Temperature
28°C (82°F)
Max Temperature
31°C (88°F)
Water Temperature
30°C (86°F)
Chance of Rain
26%
Precipitation
106 mm (4.2 in)
Rainy days
8 days
Humidity
81%
Sunshine
201 hours
Percentage Sunshine
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Koh Samui typically stay consistent throughout April, with daily highs averaging around 31°C (88°F). Nights are warm, with lows around 27°C (81°F).
Average temperatures in April
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in April
Historical weather for Koh Samui in April
Browse day-by-day weather records for Koh Samui spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Koh Samui historical weather extremes in April
According to our 42 years of weather records for Koh Samui, the following extremes were recorded between 1984 and 2026.
- The warmest day in April was on April 30, 2024, with a maximum of 37°C (99°F).
- On April 5, 2017, Koh Samui saw its coldest April day with temperatures maxing out at 27°C (81°F).
- The lowest overnight temperature recorded in April was 23°C (73°F) (April 19, 2002).
Best Places in Thailand in April
Find out more about the weather in Thailand and which places have the best travel conditions in this month. See all of Thailand in April →
perfect weather
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tolerable
unpleasant
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What to Wear in Koh Samui in April
Warm temperatures in April make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Prepare for significant rainfall with proper waterproof clothing and shoes. With water temperatures around 30°C (86°F), swimming conditions are excellent. Pack your swimsuit, goggles, and maybe some water shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Koh Samui in April
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 Samui's climate page.
Temperature Rainfall Sunshine Humidity Water Temp
See the full Koh Samui climate overview or explore weather in Thailand.
