Koh Samui

Thailand Weather in September

Average temperatures, rainfall, sunshine and the best places to visit in Thailand in September.

Planning a getaway to Thailand this September and curious about the weather you should prepare for? Discover all the vital details you need on this page, solving your puzzle:

What to Expect in Thailand in September

September in Thailand generally has temperatures that range from warm to very warm, with precipitation levels ranging from high to heavy.

Temperatures

During the day temperatures vary from warm in Bo Kluea at 28°C (82°F) to very warm in Suphan Buri at 35°C (95°F). At night it cools down to 26°C (79°F) in Suphan Buri and 20°C (68°F) in Bo Kluea. These night and day temperatures are average and some days may be even warmer. So be prepared and dress for the heat.

For a closer look at conditions across Thailand, refer to the map below.

Precipitation

In September, precipitation varies across different areas. From high rainfall in Songkhla with an average of 135 mm (5.3 in) to heavy rainfall in Ko Mak with 574 mm (23 in). Looking at the climate data spanning the last 30 years, this month sees the heaviest rainfall of the year in Bangkok.

Average sunshine

Most areas see decent amounts of sunshine this month. Bangkok gets around 155 hours of sunlight, providing a pleasant balance of sun and clouds. If you'd prefer more guaranteed sunshine, our weather planner can show you sunnier spots around the world.

Explore Thailand by month

Pick a month to see the average temperature, rainfall and sunshine in Thailand - and find the best time to visit. (based on Bangkok)

Best Places to Visit in Thailand in September

Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Thailand.

perfect weather
pleasant
tolerable
unpleasant
poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).

Popular Destinations in Thailand

What is the weather like in September for some of the most popular destinations in Thailand?

Temperature range in Thailand (September)

Precipitation variation in Thailand (September)

Bangkok

In September Bangkok generally has very high temperatures with maximum daytime temperatures around 34°C (93°F), minimum nighttime temperatures around 26°C (79°F) and heavy monthly rainfall. So on average the conditions are less favorable that month.

August
September
October
Max temperature
34°C (93°F)
34°C (93°F)
33°C (91°F)
Min temperature
27°C (81°F)
26°C (79°F)
26°C (79°F)
Monthly sun hours
160 hours
155 hours
198 hours
Monthly rainfall
225 mm (8.9 in)
333 mm (13 in)
287 mm (11 in)
Monthly rainy days
19 days
20 days
16 days
Weather conditions

Chiang Mai

In September Chiang Mai generally has very high temperatures with maximum daytime temperatures around 33°C (91°F), minimum nighttime temperatures around 24°C (75°F) and heavy monthly rainfall. So on average the conditions are less favorable that month.

August
September
October
Max temperature
32°C (90°F)
33°C (91°F)
32°C (90°F)
Min temperature
24°C (75°F)
24°C (75°F)
22°C (72°F)
Monthly sun hours
116 hours
148 hours
202 hours
Monthly rainfall
260 mm (10 in)
249 mm (9.8 in)
123 mm (4.8 in)
Monthly rainy days
21 days
18 days
12 days
Weather conditions

Patong Beach

In September Patong Beach generally has high temperatures with maximum daytime temperatures around 29°C (84°F), minimum nighttime temperatures around 26°C (79°F) and heavy monthly rainfall. So on average the conditions are less favorable that month.

August
September
October
Max temperature
30°C (86°F)
29°C (84°F)
29°C (84°F)
Min temperature
27°C (81°F)
26°C (79°F)
26°C (79°F)
Monthly sun hours
150 hours
100 hours
140 hours
Monthly rainfall
239 mm (9.4 in)
294 mm (12 in)
306 mm (12 in)
Monthly rainy days
19 days
23 days
22 days
Weather conditions

Hua Hin

In September Hua Hin generally has very high temperatures with maximum daytime temperatures around 32°C (90°F), minimum nighttime temperatures around 26°C (79°F) and high monthly rainfall. So on average the conditions are good that month.

August
September
October
Max temperature
32°C (90°F)
32°C (90°F)
31°C (88°F)
Min temperature
26°C (79°F)
26°C (79°F)
26°C (79°F)
Monthly sun hours
114 hours
108 hours
147 hours
Monthly rainfall
102 mm (4 in)
157 mm (6.2 in)
254 mm (10 in)
Monthly rainy days
18 days
18 days
17 days
Weather conditions

Ao Nang Beach

In September Ao Nang Beach generally has very high temperatures with maximum daytime temperatures around 30°C (86°F), minimum nighttime temperatures around 26°C (79°F) and heavy monthly rainfall. So on average the conditions are less favorable that month.

August
September
October
Max temperature
30°C (86°F)
30°C (86°F)
30°C (86°F)
Min temperature
26°C (79°F)
26°C (79°F)
26°C (79°F)
Monthly sun hours
152 hours
145 hours
110 hours
Monthly rainfall
275 mm (11 in)
314 mm (12 in)
312 mm (12 in)
Monthly rainy days
19 days
22 days
22 days
Weather conditions

Is your destination not in the list? Have a look at all destinations in Thailand.

Popular cities in September

Day & night temperatures, rainfall and average weather in Thailand in September.

City Weather Day temp Night temp Rainfall
Bangkok 34°C (93°F) 26°C (79°F) 333 mm (13 in)
Chiang Mai 33°C (91°F) 24°C (75°F) 249 mm (9.8 in)
Koh Samui 30°C (86°F) 27°C (81°F) 156 mm (6.1 in)
Hua Hin 32°C (90°F) 26°C (79°F) 157 mm (6.2 in)
Koh Chang 29°C (84°F) 26°C (79°F) 555 mm (22 in)
Chiang Rai 32°C (90°F) 24°C (75°F) 290 mm (11 in)

Thailand weather in September: frequently asked questions

What is the weather like in Thailand in September?

Thailand typically experiences less favorable weather in September, part of the season. Daytime highs in Bangkok average around 34°C (93°F), and temperatures drop to about 26°C (79°F) at night.

What is the average temperature in Thailand in September?

Bangkok averages a daytime maximum of 34°C (93°F) in September, with overnight lows close to 26°C (79°F).

Does Thailand get a lot of rain in September?

Yes. September brings heavy rainfall to Thailand, with Bangkok averaging around 333 mm (13 in). Expect frequent showers and pack accordingly.

Is September a Good Time to Visit Thailand?

In our opinion, September may not be the ideal time to visit Thailand due to the typically less favorable weather in Bangkok.

Generally speaking, January and December provide good weather in Bangkok. The weather in February, March, April, May, June, July, August, September, October and November, on the other hand, tends to be less favorable.

Interested in more climate information?

We have much more information about the climate in Thailand.

Weather and climate has detailed information for every country in the world. Are you going to Thailand? Get detailed historical weather averages for many cities in Thailand.

Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.

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