Koh Samui · Month comparison

March vs April

April ranks #1 overall vs March at #2. Songkran brings Thai New Year festivities — warm, slightly wetter, but culturally unmissable.

Koh Samui March — lush green tropical island coastline under clear sky

March

#2 of 12 months

Best match

Shoulder season opens: still excellent weather, noticeably cheaper, and a more relaxed pace.

  • ↑European winter crowds departing sharply — Chaweng feels genuinely spacious by mid-March
  • ↑Prices dropping 15–25% from January–February peak while weather remains excellent
Koh Samui April — traditional wooden boats resting on beach at sunset

April

#1 of 12 months

Best match

Songkran brings Thai New Year festivities — warm, slightly wetter, but culturally unmissable.

  • ↑Songkran water festival (13–15 April) transforms Na Thon and Chaweng into celebrations of Thai New Year
  • ↑Good value accommodation: 30–35% below peak-season rates with weather still mostly excellent
FactorMarchApril
Weather score
8
7
Value score
5
6
Crowd score
5
6
Events score
5
7
Atmosphere
7
8
Avg high temp31.5°C32.8°C
Monthly rain65mm83mm
Daily sunshine8hrs7.5hrs

March trade-offs

  • ↓Heat beginning to build: 31.5°C highs require midday shade and regular hydration
  • ↓Some afternoon humidity and occasional brief showers appearing from late March
  • ↓Dive visibility can reduce slightly with the change in current patterns

April trade-offs

  • ↓Songkran week: hotel prices spike temporarily and transport books up fast
  • ↓83mm of rain is manageable but occasional heavy afternoon showers begin appearing
  • ↓Peak heat of 32.8°C: demanding for any strenuous outdoor activity between 11am and 3pm
See all 12 months for Koh Samui →March in detail →April in detail →
Scores compare months within Koh Samui. Climate data: Open Meteo ERA5 30-year normals (1991–2020). Methodology →