Koh Samui in April
In April, Koh Samui averages 31°C (87°F) during the day and 27°C (80°F) at night, with frequent rain — about 23 days of the month see precipitation (107 mm total).
ShoulderConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
April is one of the wetter and less comfortable months in Koh Samui. If your dates are flexible, consider a different time of year.
How April compares to the rest of the year in Koh Samui
April is one of the warmest months in Koh Samui (1st of 12) and one of the driest months (10th of 12). Daytime temperature runs 1°C above the annual average (29°C). April runs 1°C warmer than March (30°C) and stays flat into May.
April sunrise & sunset in Koh Samui
Times shown for Koh Samui local time (Asia/Bangkok), calculated for the 15th of April. They shift by a few minutes day to day across the month.
Photography light in Koh Samui — April
Golden-hour and blue-hour windows for the 15th of April, in Koh Samui's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Koh Samui in April
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on April's tier (Shoulder) and Koh Samui's popularity.
April in Thailand — events that affect travel
Known cultural, religious, or national events that surge prices, fill hotels, or close businesses during this month. Plan around them, or build your itinerary around the ones you'd like to see.
The world's biggest water fight — three days of street-wide water battles in every Thai city. Hotels in Bangkok and Chiang Mai book solid; offices and many shops close.
Plan: Bring waterproof phone bags. Either embrace the chaos or stay in a quiet beach resort that's out of the fray.
Crowds & pricing — April in Koh Samui
Koh Samui is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Sun & mosquito risk — April in Koh Samui
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Sea temperature in Koh Samui — April
Across the year Koh Samui's sea swings from 28.6°C (January) to 32.1°C (May) — April sits at 31.7°C.
Koh Samui in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 28°C / 82°F | 25°C / 76°F | 113 mm | 24 | — |
| February | 28°C / 83°F | 25°C / 77°F | 33 mm | 17 | — |
| March | 30°C / 86°F | 26°C / 78°F | 32 mm | 17 | — |
| April | 31°C / 87°F | 27°C / 80°F | 107 mm | 23 | — |
| May | 31°C / 87°F | 27°C / 80°F | 130 mm | 29 | — |
| June | 30°C / 86°F | 27°C / 80°F | 96 mm | 27 | — |
| July | 30°C / 86°F | 26°C / 79°F | 115 mm | 28 | — |
| August | 30°C / 86°F | 26°C / 79°F | 94 mm | 28 | — |
| September | 29°C / 84°F | 26°C / 78°F | 172 mm | 29 | — |
| October | 28°C / 83°F | 25°C / 77°F | 234 mm | 31 | — |
| November | 28°C / 82°F | 25°C / 77°F | 274 mm | 29 | — |
| December | 28°C / 82°F | 25°C / 76°F | 182 mm | 24 | — |
Other cities with similar April weather
🌍 See the full ranked list of climate twins for Koh Samui in April →
Frequently asked questions
How hot is Koh Samui in April?
In April, Koh Samui averages a high of 31°C (87°F) and a low of 27°C (80°F) — generally hot.
Does it rain a lot in Koh Samui in April?
April is quite rainy in Koh Samui, with about 23 rainy days on average.
Is April a good time to visit Koh Samui?
April is hot but on the rainy side. It suits travelers who are comfortable with hot weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Koh Samui in April?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full April packing list for Koh Samui for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.