Koh Samui in March
In March, Koh Samui averages 30°C (86°F) during the day and 26°C (78°F) at night, with frequent rain — about 17 days of the month see precipitation (32 mm total).
ShoulderConditions are warm and beach-friendly. Expect daily rain or showers, often in heavy bursts.
March offers comfortable temperatures in Koh Samui, with some rain to plan around.
How March compares to the rest of the year in Koh Samui
March is in the middle of the year for warmth in Koh Samui (4th of 12) and one of the driest months (12th of 12). Daytime temperature runs 1°C above the annual average (29°C). March runs 2°C warmer than February (28°C) and warms a further 1°C into April (31°C).
March sunrise & sunset in Koh Samui
Times shown for Koh Samui local time (Asia/Bangkok), calculated for the 15th of March. They shift by a few minutes day to day across the month.
Photography light in Koh Samui — March
Golden-hour and blue-hour windows for the 15th of March, in Koh Samui's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Koh Samui in March
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 March's tier (Shoulder) and Koh Samui's popularity.
Crowds & pricing — March 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 — March 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 — March
Across the year Koh Samui's sea swings from 28.6°C (January) to 32.1°C (May) — March sits at 29.7°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 March weather
🌍 See the full ranked list of climate twins for Koh Samui in March →
Frequently asked questions
How hot is Koh Samui in March?
In March, Koh Samui averages a high of 30°C (86°F) and a low of 26°C (78°F) — generally hot.
Does it rain a lot in Koh Samui in March?
March is quite rainy in Koh Samui, with about 17 rainy days on average.
Is March a good time to visit Koh Samui?
March 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 March?
Pack lightweight, breathable clothing, sunglasses and sunscreen, plus a compact umbrella or rain jacket. See the full March packing list for Koh Samui for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.