Koh Samet Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Koh Samet.
Climate overview of Koh Samet
Koh Samet, Rayong Province, Thailand, has a stable climate with little temperature variation across the year. Average daytime temperatures hover around 31°C (88°F), peaking in April at 31°C (88°F) and dipping in January to 30°C (86°F).
The city has a wet climate, receiving around 1960 mm (77 in) of rainfall per year. Despite the high annual total, it has distinct dry (December to February) and wet (May to October) seasons. September is the wettest month. Sunshine peaks in March, when the city sees around 8.0 hours of sunshine per day.
Koh Samet Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Koh Samet - and find the best time to visit.
Monthly Temperature in Koh Samet
With minimal seasonal shifts, Koh Samet experiences a constant climate year-round. On average, daytime temperatures range from a very warm 31°C (88°F) in April to a very warm 30°C (86°F) in January.
Nighttime temperatures range from 27°C (81°F) in April to 25°C (77°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Koh Samet
Koh Samet has a notably wet climate with abundant precipitation, recording 1960 mm (77 in) of rainfall per year. The seasons in Koh Samet bring significant changes in precipitation. The wettest month, September, receives heavy rainfall, with an average of 322 mm (13 in) of precipitation. This rainfall is distributed across 19 rainy days.
In contrast, the driest month, December, experiences much less rainfall, totaling 16 mm (0.6 in) over a single rainy day. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Koh Samet Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Koh Samet
In Koh Samet, summer days are longer and more sunny, with daily sunshine hours peaking at 8.0 hours in March. As the darker season arrives, the brightness of the sun becomes less. September sees a soft sun for only 3.7 hours per average day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Koh Samet by Month
The relative humidity is high throughout the year in Koh Samet.
The city experiences its highest humidity in October, reaching 85%. In December, the humidity drops to its lowest level at 71%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Koh Samet
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, February and December
- Warmest weather: all year round
- Most sunshine: January, March and December
- Fewest rainy days: January and December
- Wettest months: May, June, July, August, September and October, when rainfall is highest.
- Seasonal pattern: Distinct dry (December to February) and wet (May to October) seasons
Frequently asked questions about the climate in Koh Samet
What is the best time to visit Koh Samet?
January, February and December typically offer the most optimal weather in Koh Samet. In contrast, May, June, July, August, September and October tend to have less optimal conditions. Koh Samet has distinct dry (December to February) and wet (May to October) seasons.
What temperatures can I expect in Koh Samet?
Daytime highs range from 30°C (86°F) in January to 31°C (88°F) in April. Nighttime lows range from 25°C (77°F) to 27°C (81°F). Temperatures stay relatively stable year-round.
How much rain does Koh Samet get?
Annual rainfall is around 1960 mm (77 in). September is the wettest month with 322 mm (13 in), while December is the driest with 16 mm (0.6 in).
How sunny is Koh Samet?
Koh Samet receives around 2,073 hours of sunshine per year. March is the sunniest month with 240 hours, while September is the cloudiest with just 110 hours. Overall, Koh Samet enjoys abundant sunshine.
Koh Samet 3-Day Forecast
Koh Samet on the map
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