Southeast Thailand weather in September 2025
Southeast Thailand weather in September 2025
Day
32 °C
Night
23 °C
Sea
29 °C
Precipitation
137 mm
in month
Rainy days
20 days
in month
Daylight
12 hours
average
Sunshine
6 hours
average
Humidity
79 %
Day
32 °C
Night
23 °C
Sea
29 °C
Precipitation
137 mm
in month
Rainy days
20 days
in month
Daylight
12 hours
average
Sunshine
6 hours
average
Humidity
79 %
Overview: Southeast ThailandSoutheast Thailand is a popular destination for tourists, known for its beautiful beaches, stunning temples, and vibrant markets. Explore the island of Koh Samui, which offers a range of activities, including swimming, snorkeling, and scuba diving. Koh Phangan, located nearby, famous for its full moon parties, beautiful beaches, and lush jungles. Don't forget to taste local spicy curries, noodle dishes, and fresh seafood.
Travel information
Flights
to
Activities
in Koh Samui
Weather charts for Southeast Thailand
Data backed by 40 years of history
We make the most from 40 years of historical weather data to predict the best weather conditions.
Selection of world's favourite destinations
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
16 500 000 weather records
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.
Find more destinations like this
Activities in Southeast Thailand
Flights to Southeast Thailand
Destinations in Southeast Thailand
Destinations with similar weather to Southeast Thailand
Weather overview and FAQs
Weather overview
In Southeast Thailand in September, the average air temperature ranges from 32 °C (89 °F) during the day to 23 °C (73 °F) at night. There are 20 days of rain on average, where the rainfall is 137 mm (5.41 in).
Are there good conditions to visit in September in Southeast Thailand?
Southeast Thailand can be visited in September - the weather will be moderate. September is the wet season month in Southeast Thailand, which means that there may be more frequent rains during your stay.
What temperature can I expect during the day in Southeast Thailand in September?
In Southeast Thailand in September, the average daily temperatures will be 32 °C (89 °F). The great temperature for lying by the sea or pool and sunbathing, everywhere else you will probably be a bit hot. Don't forget to drink during the day, in these temperatures you should hydrate yourself a lot.
What is the sea temperature in September in Southeast Thailand?
In September in Southeast Thailand expect the sea to be warm at 29 °C (84 °F). This temperature is someone's dream come true, while for someone it may no longer be ideal for the purpose of refreshment.
Is September part of the wet season in Southeast Thailand?
Yes, in September in Southeast Thailand there is a wet season with 20 days, when there is rain in a month.
What is the average number of rainy days in Southeast Thailand in September?
There are 20 days, which are rainy in Southeast Thailand in September, that is, days with precipitation more than 2 mm (0.08 in). Converted to days of the week, this means that it will occur on an average of 4.7 days of the week, or in general - 67 % days.
What is the rainfall intensity in September in Southeast Thailand?
In September in Southeast Thailand, there is 137 mm (5.41 in) rainfall, which means on average 5 mm (0.18 in) rainfall per day.
What is the air temperature in September in Southeast Thailand at night?
The average night temperature in Southeast Thailand in September is 23 °C (73 °F). A very pleasant temperature for long evening walks, fun over a drink outside, or doing sports in the morning. If possible, look for a hotel with air conditioning.
How many hours of sun to expect in Southeast Thailand in September?
There is an average length of sunshine of 6 hours per day in Southeast Thailand in September.
Is it hot in Southeast Thailand in September?
In Southeast Thailand in September, you will enjoy nice warm weather, but it will also be pleasant and you probably won't feel hot.
How windy is it in September in Southeast Thailand?
An average wind scale that can be expected in Southeast Thailand in September is 2. It is rather a milder or unnoticeable wind, therefore it will not bother you during your holiday.
Is the weather in Southeast Thailand warmer in September than in August?
No, September is not warmer in Southeast Thailand than August.
What is the humidity in Southeast Thailand in September?
Humidity in Southeast Thailand in September is 79 %. This humidity is rather above average, but except for sensitive individuals, it should not be a problem.
Is Southeast Thailand rainier in September than in October?
No, September in Southeast Thailand is not a rainier month than October.
How long is the day (from dawn till dusk) in Southeast Thailand in September?
The length of daylight in Southeast Thailand in September is 12 hours.