Ko Samui
May
Weather in Ko Samui for May 2025
Your guide to Ko Samui weather in May - trends and predictions
In general, the average temperature in Ko Samui at the beginning of May is 30.4 °C. As the month progressed, temperatures tended to slightly increase, reaching an average of 30.6 °C by the end of May.
Ko Samui experiences an exceptionally high level of rainfall in May, with more than 24 rainy days on average.
Is May a good time to visit Ko Samui? check out the best time to travel to Ko Samui page.
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4
Dry days
27
Rainy days
0
Snow days
30°/29°
Temperatures
21 km/h
Avg max wind
72 %
Avg humidity
Ko Samui in May average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  30° | 2  30° | 3 30° | 4 31° | |||
| 5 31° | 6 31° | 7 30° | 8 30° | 9  30° | 10 30° | 11 30° |
| 12 30° | 13 30° | 14 30° | 15 30° | 16 30° | 17 30° | 18 30° |
| 19 30° | 20 30° | 21 30° | 22 29° | 23 29° | 24 30° | 25 31° |
| 26 31° | 27 30° | 28 30° | 29 31° | 30 31° | 31  30° |
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Temperatures trend during May in Ko Samui
See the weather trend as well as the moving average line
May weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 May | Patchy rain possible | 30° /29° | 1.2 mm | 7 | |
| 2 May | Partly cloudy | 30° /29° | 1 mm | 8 | |
| 3 May | Patchy rain possible | 30° /29° | 0.2 mm | 7 | |
| 4 May | Partly cloudy | 31° /29° | 2 mm | 8 | |
| 5 May | Partly cloudy | 31° /29° | 0.4 mm | 8 | |
| 6 May | Patchy rain possible | 31° /29° | 5.8 mm | 7 | |
| 7 May | Light rain shower | 30° /28° | 3.5 mm | 7 | |
| 8 May | Partly cloudy | 30° /29° | 0 mm | 8 | |
| 9 May | Thundery outbreaks possible | 30° /29° | 0.2 mm | 7 | |
| 10 May | Light rain shower | 30° /28° | 6.2 mm | 7 | |
| 11 May | Thundery outbreaks possible | 30° /29° | 0.3 mm | 7 | |
| 12 May | Patchy rain possible | 30° /29° | 1.2 mm | 7 | |
| 13 May | Thundery outbreaks possible | 30° /29° | 0 mm | 7 | |
| 14 May | Patchy rain possible | 30° /29° | 3.2 mm | 7 | |
| 15 May | Patchy rain possible | 30° /29° | 0.5 mm | 7 | |
| 16 May | Patchy rain possible | 30° /29° | 6.1 mm | 7 | |
| 17 May | Light rain shower | 30° /28° | 13 mm | 7 | |
| 18 May | Patchy rain possible | 30° /28° | 1.2 mm | 7 | |
| 19 May | Patchy rain possible | 30° /29° | 8 mm | 7 | |
| 20 May | Patchy rain possible | 30° /29° | 3.4 mm | 7 | |
| 21 May | Patchy rain possible | 30° /29° | 6.7 mm | 7 | |
| 22 May | Light rain shower | 29° /28° | 8.5 mm | 6 | |
| 23 May | Light rain shower | 29° /27° | 3.8 mm | 6 | |
| 24 May | Patchy rain possible | 30° /28° | 0.5 mm | 7 | |
| 25 May | Light rain shower | 31° /29° | 5.9 mm | 7 | |
| 26 May | Patchy rain possible | 31° /30° | 2 mm | 7 | |
| 27 May | Patchy rain possible | 30° /29° | 1.5 mm | 7 | |
| 28 May | Patchy rain possible | 30° /29° | 2 mm | 7 | |
| 29 May | Light rain shower | 31° /29° | 1.1 mm | 7 | |
| 30 May | Light rain shower | 31° /29° | 4 mm | 7 | |
| 31 May | Moderate or heavy rain shower | 30° /26° | 32.6 mm | 7 | |
| Next | |||||
Important Notice
Our weather forecast for Ko Samui in May is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Ko Samui forecast closer to your planned date for the most up-to-date weather information.
Ko Samui in May - FAQ
What are the expected maximum and minimum temperatures in Ko Samui during May?
During May, expect a variety of temperatures with highs around 30° and lows near 29°, suitable for diverse activities and preferences.
How much rainfall should be expected in Ko Samui during May?
Significant rainfall exceeding 126.3 mm is expected in Ko Samui during May, occurring over more than 27 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Ko Samui during May?
The average wind speed in Ko Samui during May is 21 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to Ko Samui in May?
As you prepare for your trip to Ko Samui in May, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Ko Samui, during May, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Sandals/Flip-flops: Comfortable for warm climates
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
- Insect Repellent: For destinations with mosquitos or other insects
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Where is Ko Samui?Get accurate weather forecasts for Ko Samui, located at latitude 9.536 and longitude 99.936. Stay updated with localized weather information tailored for Ko Samui.
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