Weather in Ko Samui in September 2024
Average weather
Average temperature in Ko Samui in September
The temperature in September is +81°F on average, with a range between a maximum of +82°F during the day and a minimum of +75°F at night.
The average maximum temperature goes up 0% by the end of the month, compared with the beginning of the month, from +81°F to +81°F.
Is Ko Samui warm or cold in September?
Ko Samui is typically warm in September.
Maximum temperatures go down compared to the previous month from +81°F to +81°F. The minimum temperature also goes up from +77°F to +75°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
September is one of the warmest months in Ko Samui, here is the comparison with other months:
Climate in Ko Samui in September
| August | September | October | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +81°F | +81°F | +79°F | ||||
| Min. temperature | ||||||
| +68°F | +70°F | +70°F | ||||
| Max. temperature | ||||||
| +91°F | +90°F | +90°F | ||||
| Rainfall | ||||||
| 85 mm | 141 mm | 243 mm | ||||
| Wind | ||||||
| 3 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 77% | 79% | 81% | ||||
| Air pressure | ||||||
| 1007 HPa | 1008 HPa | 1009 HPa | ||||
| Sunny days | ||||||
| 0 | 0 | 0 | ||||
| Cloudy days | ||||||
| 20 | 13 | 10 | ||||
| Rainy days | ||||||
| 11 | 17 | 21 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
September weather is still as ok as in August. The temperature levels stay the same in the area of +81°F for average maximum temperature during the day. Prepare for more rain. Average rainfall goes from 85 mm to 141 mm. Humidity rises from 77% to 79%. Winds are calmer in comparison to August, going down from 3 m/s to 2 m/s on average. The amount of sunny days stay about the same, averaging 0 sunny days during the month.
October brings much the same weather, it remains ok.
Wind
The average wind speed is 3 m/s getting up to 4 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Ko Samui is gradually increasing during September, going from 2 m/s to 3 m/s over the course of the month.
Rain
How was the weather last September in Ko Samui?
Climate Change Over the Years
The climate in Ko Samui in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1986 (+83°F) and the highest in 2013 (+86°F). The driest year was 1980 with only 64 mm of rainfall, and the wettest year was 2017 with 305 mm.
FAQ
Is September a good time to visit Ko Samui?
Can you sunbathe in Ko Samui in September?
Is Ko Samui rainy in September?
Is it sunny in Ko Samui in September?
Other cities in Thailand
Monthly weather in Ko Samui
Source of the data
For this page, we’ve looked at the typical weather in Ko Samui, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.