Thailand in september: average Weather, Temperature and Climate, Where to go?
Weather in Thailand in september 2025
Below, check out the weather forecast for september for most popular cities in Thailand. These predictions are statistics for september from weather reports for many years. The percentage indicates the possibility of having the weather indicated.
Average weather in september in Bangkok
tolerable weather UV index: 7
Weather at 6am
81°F
Moderate rain at times
34% of time
29%
19%
12%
Weather at 12pm
90°F
Partly Cloudy
33% of time
30%
16%
15%
Weather at 6pm
86°F
Moderate rain at times
40% of time
25%
21%
7%
Weather at 3am
81°F
42%
29%
15%
8%
Where to go in Thailand in september?
Where to go in Thailand in september: destination map
Where to go in each region in september?
| Central Thailand (Bangkok, Hua Hin, Kanchanaburi...) | 86°F to 92°F | 11 à 17 days | 85°F to 86°F | tolerable weather |
| East of Thailand (Pattaya, Koh Chang, Chanthaburi...) | 85°F to 90°F | 12 à 23 days | 85°F to 86°F | bad weather* |
| Northeastern Thailand (Isan) (Khon Kaen, Ubon Ratchathani (Isan), Nakhon Ratchasima...) | 88°F to 90°F | 15 à 23 days | tolerable weather* | |
| Northern thailand (Chiang Mai, Chiang Rai, Pai...) | 85°F to 92°F | 8 à 26 days | tolerable weather* | |
| Phuket (Phuket town, Patong, Kata Beach...) | 85°F | 17 à 21 days | 85°F | tolerable weather |
| Southern Thailand (Koh Samui, Khao Lak national Park, Krabi - Ao Nang...) | 85°F to 92°F | 9 à 21 days | 85°F to 86°F | tolerable weather |
Where should you go in Thailand in september when it comes to the weather?
Remember:
The climate in Thailand in september ranges from tolerable to bad depending on the region and city.
Except for the northern part of the country, the climate in Thailand throughout September is experiencing renewed rains. It does not rain all day and the sky is either cloudy or sunny. On the temperatures side, the average daytime temperature revolves around 28° C.
Bangkok and the Center of Thailand in September
In September, Bangkok and the Center are not spared by rain and thunderstorms. The air in the capital may be stifling due to the ubiquitous heat, which rises from 25° C at night to 32° C during the day. The sky remains covered most of the time; hikers in the hinterland of Thailand will be wary of slippery terrain and flooding.
East of Thailand in September
The wet season is finally coming to an end. East Thailand is experiencing a lull in Koh Chang, but Pattaya remains well watered. The sky is above all covered by clouds; the degree of humidity combined with still high temperatures (maximum 32° C in Pattaya and 27° C in Koh Chang) brings a sometimes oppressive atmosphere.
Northern Thailand in September
The thermometer displays peaks close to those of August (32° C in Chiang Mai) and even if the air remains very wet, the sky gradually emerges. Thunderstorms are very present in Chiang Rai, but the rains are clearly declining. The nights become a little cooler.
Northeast Thailand in September
In September, the rains have regressed throughout the Northeast, especially near the Laotian border. Expect for at least two weeks of rainy days (average humidity of 97%) and maximum temperatures of 32-33° C. Thunderstorms are very frequent - caution for hikers!
Southeast Thailand in September
September is the month of the rainy season, which is part of an enjoyable stay in this part of the coast. The islands of Koh Samui, Koh Tao and Koh Phangan receive only light showers. Temperatures range from 24° C to 31° C, for a water at 28° C. The climate of the continental coast resembles that of May, except for a thermometer displaying temperatures a little less warm.
Southwest of Thailand in September
September on the southwest coast is synonymous with very humid climate. Phuket and Koh Lanta are no exception to this resurgence of showers, but temperatures remain at 28° C (peaks 32-33° C on Phuket and Krabi). As a result, the air is sometimes very stifling. If staying here, it is better to opt for the Gulf of Thailand: four times less watered at this time.
Climate in Thailand in september
Climate in Bangkok in september
In the month of september, the mean temperature in Bangkok is 86°F (maximum temperature is 92°F and minimum temperature is 81°F). The climate is very warm in this location in this month. With 12.8in over 17 days, rain is to be feared throughout your trip. Consider to bring adapted clothes.
With a correct weather, september is okay (but not the best time) for traveling in Bangkok in Thailand.
| September | |||
| Average temperature | 86°F | ||
| Highest temperature | 92°F | ||
| Lowest temperature | 81°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 12.8in | ||
| Number of days with rainfall | 17 day(s) (57%) | ||
| Humidity | 82% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 50% | ||
| Length of day | 12:12 | ||
| Our opinion at whereandwhen.net | tolerable |
Climate in Chanthaburi in september
In the month of september, the mean temperature in Chanthaburi is 83°F (maximum temperature is 86°F and minimum temperature is 81°F). The climate is very warm in this city in september. With 18.2in over 21 days, rain is to be feared for your vacations. So remember to pack Rain coats.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 86°F | ||
| Lowest temperature | 81°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 18.2in | ||
| Number of days with rainfall | 21 day(s) (69%) | ||
| Humidity | 88% | ||
| Daily sunshine hours | 10 | ||
| Cloud cover | 49% | ||
| Length of day | 12:12 | ||
| Our opinion at whereandwhen.net | bad |
Climate in Chiang Mai in september
In the month of september, maximum temperature is 92°F and minimum temperature is 76°F (for an average temperature of 83°F). The climate is very warm in that locality in september. With 5.2in over 8 days, you will experience some showers for your vacations. But this is pretty moderate and it is only of temporary showers.
With proper weather, september is okay (but not the best time) for traveling in that area.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 92°F | ||
| Lowest temperature | 76°F | ||
| Rainfall | 5.2in | ||
| Number of days with rainfall | 8 day(s) (27%) | ||
| Humidity | 91% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 43% | ||
| Length of day | 12:14 | ||
| Our opinion at whereandwhen.net | good |
Climate in Chiang Rai in september
In the month of september, maximum temperature is 90°F and minimum temperature is 74°F (for an average temperature of 83°F). The climate is burning in this location in the month of september. With 12.1in over 17 days, the weather is rather to rain throughout your stay. Consider to pack adapted clothes.
With proper weather, september is okay (but not the best month) for traveling in this city.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 90°F | ||
| Lowest temperature | 74°F | ||
| Rainfall | 12.1in | ||
| Number of days with rainfall | 17 day(s) (56%) | ||
| Humidity | 95% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 48% | ||
| Length of day | 12:15 | ||
| Our opinion at whereandwhen.net | tolerable |
Climate in Hua Hin in september
In the month of september, the mean temperature in Hua Hin is 83°F (maximum temperature is 88°F and minimum temperature is 79°F). The climate is burning in this city in september. With 11.9in over 15 days, rainfall can happen for your trip. But this is reasonably and you will not be too bothered by it.
With a correct weather, september is okay (but not good month) for traveling there in Thailand.
| September | |||
| Average temperature | 83°F | ||
| Highest temperature | 88°F | ||
| Lowest temperature | 79°F | ||
| Sea temperature | 85°F | ||
| Rainfall | 11.9in | ||
| Number of days with rainfall | 15 day(s) (50%) | ||
| Humidity | 84% | ||
| Daily sunshine hours | 11 | ||
| Cloud cover | 47% | ||
| Length of day | 12:12 | ||
| Our opinion at whereandwhen.net | tolerable |
All cities in Thailand in september
| Bangkok in september | tolerable weather |
| Chanthaburi in september | bad weather |
| Chiang Mai in september | good weather |
| Chiang Rai in september | tolerable weather |
| Hua Hin in september | tolerable weather |
| Kanchanaburi in september | tolerable weather |
| Khao Lak national Park in september | tolerable weather |
| Khon Kaen in september | tolerable weather |
| Koh Chang in september | bad weather |
| Koh Lanta in september | tolerable weather |
| Koh Phangan in september | tolerable weather |
| Koh Phi Phi in september | very bad weather |
| Koh Samui in september | tolerable weather |
| Koh Tao in september | tolerable weather |
| Krabi - Ao Nang in september | tolerable weather |
| Nakhon Ratchasima in september | tolerable weather |
| Pattaya in september | bad weather |
| Phuket in september | tolerable weather |
| Ubon Ratchathani (Isan) in september | very bad weather |
| Ayutthaya in september | tolerable weather |
| Koh Kut (Koh Kood) in september | tolerable weather |
Weather data for Thailand in september:
Weather data for Thailand in september is derived from an average of the weather forecast since 2009 in Thailand. There is a margin of error and these forecasts are to be considered as general information only. The weather in Thailand can vary slightly from year to year, but these predictions should limit surprises. So you can pack your bags and check when is the best time to go to Thailand.