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Khon Kaen Weather in September
September in Khon Kaen averages 33°C (91°F) during the day and 25°C (77°F) at night. It is the wettest month of the year, with 256 mm (10 in) of rainfall on average, so waterproof gear is a must.
Rainfall in Khon Kaen in September
As part of the rainy season, Khon Kaen sees around 18 days of rain in September, with an average of 256 mm (10 in). The rainy season here brings regular, substantial showers. It's worth being prepared for rain on most days you're out.
Temperature in Khon Kaen in September
September in Khon Kaen brings typical temperatures with highs around 33°C (91°F) and lows of 25°C (77°F). It's usually most comfortable outside during the morning and later in the day. With lows around 25°C (77°F), the nights are warm enough that a sheet is usually all you need for bedding.
Sunshine in Khon Kaen in September
The city usually sees around 145 hours of sunlight, indicating a moderately sunny period (despite it being part of rainy season).If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit Khon Kaen. Our weather planner can help you explore destinations with more pleasant weather conditions.
Khon Kaen Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
33°C (91°F)
Chance of Rain
59%
Precipitation
256 mm (10 in)
Rainy days
18 days
Humidity
83% *
Sunshine
145 hours *
Percentage Sunshine
*
* Data from: Kalasin, Thailand (71 KM, 44 Miles).
Khon Kaen Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Khon Kaen - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Khon Kaen typically stay consistent throughout September, with daily highs averaging around 33°C (91°F). Nights are warm, with lows around 24°C (75°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather records for Khon Kaen in September
Browse day-by-day weather records for Khon Kaen spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Khon Kaen historical weather extremes in September
According to our 50 years of weather records for Khon Kaen, the following extremes were recorded between 1976 and 2026.
- The hottest September day on record in Khon Kaen reached 37°C (99°F) (September 26, 2018).
- On September 5, 1977, Khon Kaen saw its coldest September day with temperatures maxing out at 24°C (75°F).
- Khon Kaen registered its coldest September night on September 20, 2018, with temperatures dropping to 21°C (70°F).
- The wettest September day on record brought 174 mm (6.9 in) of precipitation to Khon Kaen (September 17, 1994).
Best Places in Thailand in September
Find out more about the weather in Thailand and which places have the best travel conditions in this month. See all of Thailand in September →
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).
What to Wear in Khon Kaen in September
Hot weather in September means keeping cool is the priority. Loose-fitting clothes in natural fabrics work best. Pack plenty of shorts, tank tops, and breathable shirts. Don't forget a hat, swimwear, and comfortable sandals. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! It won't hurt to bring your sunglasses along, as you'll see some sunny periods.
What To Do in Khon Kaen in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Swimming7/10 -
Cycling7/10 -
Walking7/10 -
Camping7/10 -
Outdoor sports7/10
Khon Kaen 3-Day Forecast
More climate data for Khon Kaen
Temperature Rainfall Sunshine Humidity
See the full Khon Kaen climate overview or explore weather in Thailand.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bangkok
34°C (93°F) Chiang Mai33°C (91°F) Jomtien Beach32°C (90°F) Hua Hin32°C (90°F) Ao Nang Beach30°C (86°F) Koh Samui30°C (86°F) Ko Lanta30°C (86°F) Patong Beach29°C (84°F) Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
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