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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Thailand, check out our Khon Kaen's climate page.
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
*
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 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 49 years of weather records for Khon Kaen, the following extremes were recorded between 1976 and 2025.
- 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
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tolerable
unpleasant
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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.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Thailand, check out our Khon Kaen's climate page.
Temperature Rainfall Sunshine Humidity
See the full Khon Kaen climate overview or explore weather in Thailand.
