Weather in Koh Samui in March
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Compare car hire prices → Affiliate link — we earn a commission at no extra cost to youMarch in Koh Samui is hot, with average highs of 30.5°C and lows of 25.4°C. It is mostly dry with only occasional showers, with roughly 10.9 hours of sunshine a day. Weather-wise, this is one of the most reliable months to travel. For the complete picture, see the best time to visit Koh Samui — every month compared. Once you know when to go, find your Koh Samui packing list at 247PackingList.
Get ready for Koh Samui in March
Search flights to Koh Samui
Compare 100+ airlines for March — one search, best price.
Search Flights →Lightweight travel clothing
Lightweight, breathable clothing and a compact travel umbrella are essential in this climate.
Check Price →What to pack for Koh Samui in March
- Lightweight, breathable clothing
- High SPF sunscreen
- Sunglasses
- Sun hat
- Reusable water bottle
Compare all months in Koh Samui
| Month | High | Rain | Rating |
|---|---|---|---|
| January | 28.5°C | 43.1mm | 10/10 |
| February | 29.0°C | 58.2mm | 10/10 |
| March | 30.5°C | 36.5mm | 10/10 |
| April | 31.1°C | 106.9mm | 9/10 |
| May | 31.0°C | 134.5mm | 9/10 |
| June | 30.6°C | 102.4mm | 9/10 |
| July | 30.0°C | 149.9mm | 9/10 |
| August | 30.4°C | 114.2mm | 9/10 |
| September | 29.2°C | 196.8mm | 9/10 |
| October | 28.5°C | 244.4mm | 8/10 |
| November | 28.1°C | 323.1mm | 8/10 |
| December | 27.9°C | 161.7mm | 9/10 |
Full month-by-month guide: best time to visit Koh Samui →
For facts about Thailand — currency, language and dialling code — see our Thailand country guide at 247CountryInfo. Travellers also find it useful to keep a Koh Samui travel guide to hand. Check clothing sizes in Thailand before you shop.
Frequently Asked Questions
Is March a good time to visit Koh Samui?
March rates 10/10 for visiting Koh Samui — excellent time to visit. Expect average highs of 30.5°C, 36.5mm of rain across the month and about 10.9 hours of daily sunshine.
What is the temperature in Koh Samui in March?
In March, Koh Samui has average highs of 30.5°C (86.9°F) and average lows of 25.4°C (77.7°F).
Does it rain in Koh Samui in March?
Not much. March averages just 36.5mm of rain in Koh Samui — the odd shower is possible but most days stay dry.
What should I wear in Koh Samui in March?
For Koh Samui in March (30.5°C highs / 25.4°C lows), pack lightweight, breathable clothing plus high spf sunscreen, sunglasses, sun hat.
More essentials for Koh Samui in March
Packing cubes
Keep the bag organised whatever the weather — compression cubes for every size.
Check Price →Travel first aid kit
Compact TSA-friendly kit for peace of mind wherever you travel.
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Climate data sourced from Open-Meteo (open source, open data licence). Monthly averages calculated from 2020–2023 historical data. Weather can be unpredictable — always check a live forecast before travelling.