Koh Samui Weather in March

Koh Samui in March averages 30°C (86°F) during the day and 27°C (81°F) at night. Keep in mind that quite a bit of rainfall is expected this month.

Rainfall in Koh Samui in March

Analyzing past climate data, one can expect approximately 5 days of rain, averaging 94 mm (3.7 in). Showers tend to be short but heavy rather than persistent drizzle. When it rains, it usually means it, but it doesn't last long.

Temperature in Koh Samui in March

Daytime temperatures in Koh Samui reach 30°C (86°F) in March, dropping to 27°C (81°F) at night. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. Nights remain warm at around 27°C (81°F). For a more comfortable sleep, a cold shower before bed and a fan or air conditioning can make a big difference.

Sunshine in Koh Samui in March

Enjoy a sunny month with about 240 hours of sunshine, the clear skies make Koh Samui even more beautiful.

Average water temperature in March

The water reaches 29°C (84°F) this month. It's on the warm side, which suits people who prefer that, but don't expect a cooling dip if the air temperature is also high.

If you prefer dry days with pleasant temperatures, January and February typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.

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• January
• February
• March
• April

• May
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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 March

Min Temperature 27°C (81°F)  

Max Temperature 30°C (86°F)  

Water Temperature 29°C (84°F)  

Chance of Rain 15%  

Precipitation 94 mm (3.7 in)  

Rainy days 5 days  

Humidity 82%  

Sunshine 240 hours  

Percentage Sunshine  

Daily Historical Temperatures

49-year average (1976-2025)

Based on our historical records, temperatures in Koh Samui typically stay consistent throughout March, with daily highs averaging around 30°C (86°F). Nights are warm, with lows around 26°C (79°F).

Average temperatures in March

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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 March

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Historical weather for Koh Samui in March

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.

Historical weather Temperatures Precipitation

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‹ January February March April May June July August September October November December ›

Koh Samui historical weather extremes in March

According to our 44 years of weather records for Koh Samui, the following extremes were recorded between 1982 and 2026.

• The warmest day in March was on March 7, 2015, with a maximum of 39°C (102°F).
• On March 14, 1982, Koh Samui saw its coldest March day with temperatures maxing out at 25°C (77°F).
• The lowest overnight temperature recorded in March was 21°C (70°F) (March 4, 1992).

What to Wear in Koh Samui in March

Warm temperatures in March 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. Expect water temperatures of around 29°C (84°F), which is ideal for taking a refreshing dip. Bring swimwear and consider packing a towel for drying off. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Koh Samui in March

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

9/10

Cycling

7/10

Walking

7/10

Camping

7/10

Outdoor sports

7/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Thailand, check out our Koh Samui's climate page.

More climate data for Koh Samui

Temperature Rainfall Sunshine Humidity Water Temp

See the full Koh Samui climate overview or explore weather in Thailand.