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Climate · Koh Samui

Koh Samui in April

Warm and damp, as the days lengthen.

Typical weather, averaged over 30 years

April in Koh Samui is warm: highs near 84°F, lows near 79°F. Rain falls on about three days a week, and the days lengthen by 11 minutes from the first week to the last.April in Koh Samui is warm: highs near 29°C, lows near 26°C. Rain falls on about three days a week, and the days lengthen by 11 minutes from the first week to the last.

High
84°F29°Caverage
Low
79°F26°Caverage
Wet days
3a week · 43% of days
Daylight
12h 20mon average

Is April a good time to visit Koh Samui?

A good month, just outside Koh Samui's best months, which run from 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 April sits in the year

week by week

Temperature

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

Chance of a wet day

43% of days in April, against 30% to 89% through the year.

Cloud cover

75% cover in April, against 59% to 80% through the year.

Daylight

12h 20m in April, against 11h 35m to 12h 40m through the year.

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

Either side

  1. March82°28°low 77°low 25°2 wet days a weekRain on about two days a week.
  2. April84°29°low 79°low 26°3 wet days a weekRain on about three days a week.
  3. May84°29°low 79°low 26°5 wet days a weekRain on about five days a week.

Where Koh Samui sits, in April

Asia/Bangkok
this place
typical high in April 40°F4°C95°F35°C
Sunrise, mid-April
6:10 AMsets 6:30 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 April, 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 April

high · low · wet days
See April on the planning mapThe whole year in Koh Samui

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.