Weather by month
Koh Samui in April 2027
April is usually one of the driest months on Koh Samui: few rain days, calm seas more often than not, and long beach days.
April at a glance
- Average high
- 31.8 °C
- Average low
- 26.0 °C
- Rainfall
- 83 mm
- Rain days
- 6.1 days
50% less rain than an average month
Averages: WMO Climate Normals 1991–2020, Ko Samui (station 48550, Thai Meteorological Department observations), as published on Wikipedia (secondary source, checked 7 Nov 2026). Not a forecast — for warnings use the Thai Meteorological Department. TMD weather warnings
Season verdict
Usually dry — one of the best months for beaches and boat trips.
Good for
Beach days, snorkeling, island-hopping boat trips, viewpoints at sunset
Less good for
Midday hikes in the heat — start early or late
Sea & boat trips
Outside the northeast monsoon the sea is calmer more often, but wind and waves still change day to day. Always check the operator before a boat trip.
Open or closed
Ang Thong Marine National Park is usually open in April. Trips still depend on the sea on the day. Park information
Holidays & alcohol-sale bans in April 2027
- Songkran (Thai New Year)13 Apr 2027 – 15 Apr 2027
Full holiday calendar · Dates: Bank of Thailand holiday notifications and Thai press; check before you travel.
Events in April
- Lamai Night Plaza (daily)30 dates from 1 Apr 2027
- Nathon Night Food Market (daily)30 dates from 1 Apr 2027
- Chaweng Night Market / Food Village (daily)30 dates from 1 Apr 2027
- ARKbar Fire Show30 dates from 1 Apr 2027
- Fisherman's Village Walking Street (Friday)5 dates from 2 Apr 2027
- Muay Thai Fight Night — Samui International Stadium13 dates from 2 Apr 2027
- Lamai Sunday Walking Street4 dates from 4 Apr 2027
- Songkran (Thai New Year Water Festival)3 dates from 13 Apr 2027
What to pack
Strong sun protection, a hat, reef-safe sunscreen and a refillable water bottle.
One next step
Calm-sea season is the time for snorkeling. See the best spots and when to go.
Snorkeling guide