Climate · Koh Samui

Koh Samui in March

Warm and damp, as the days lengthen.

Typical weather, averaged over 30 years

March in Koh Samui is warm: highs near 82°F, lows near 77°F. Rain falls on about two days a week, more often as the month goes on, and the days lengthen by 15 minutes from the first week to the last.March in Koh Samui is warm: highs near 28°C, lows near 25°C. Rain falls on about two days a week, more often as the month goes on, and the days lengthen by 15 minutes from the first week to the last.

High
82°F28°Caverage
Low
77°F25°Caverage
Wet days
2a week · 30% of days
Daylight
12h 04mon average

Is March a good time to visit Koh Samui?


Yes. March is one of Koh Samui's best months (January to March).

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How March sits in the year

week by week

Temperature

Highs near 82°F in March, against 80°F to 84°F through the year.Highs near 28°C in March, against 27°C to 29°C through the year.

Chance of a wet day

30% of days in March, against 30% to 89% through the year.

Cloud cover

63% cover in March, against 59% to 80% through the year.

Daylight

12h 04m in March, against 11h 35m to 12h 40m through the year.

Week by week, lightly smoothed, with March shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side


  1. February81°27°low 76°low 24°2 wet days a weekRain on about two days a week.
  2. March82°28°low 77°low 25°2 wet days a weekRain on about two days a week.
  3. April84°29°low 79°low 26°3 wet days a weekRain on about three days a week.

Where Koh Samui sits, in March

Asia/Bangkok

this place
typical high in March 40°F4°C95°F35°C
Sunrise, mid-March
6:28 AMsets 6:31 PM
Above the sea
420 mlow-lying
Latitude
9.5°Nnorthern hemisphere
Nearest of ours
Krabi183 km south-west

The land around Koh Samui, shaded by its typical high in March, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Thailand in March

high · low · wet days

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Koh Samui. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (420 m) against the climate model's (71 m).Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match, and both highs and lows are adjusted for the town's height (420 m) against the climate model's (71 m). Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.