Climate averages 1991–2020
Khon Kaen weather
in September.
A hot, very wet month: the 8th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Khon Kaen: daytime highs average 30.1°C and nights cool to about 23.8°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 237 mm of rain on roughly 23 days, which makes September a very wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 12 h 14 min on an average September day.
The nearest other city in this atlas is Udon Thani (108 km away). In September its highs average 29.9°C, about as warm as Khon Kaen, with 276 mm of rain.
Among the 46 cities listed in Thailand, Khon Kaen ranks joint 29th of 46 for the warmest September highs and joint 17th of 46 for the driest September (rainfall, lowest first). The mean September high of those 46 cities is 30.3°C; Khon Kaen is 0.2°C cooler than that mean.
From September to October, average highs fall by 0.5°C to 29.6°C, and monthly rainfall falls from 237 mm to 104 mm.
The annual picture
September in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Khon Kaen climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 29.3°C18.1°C | 18.1°C | 7.2 | 1.7 | 11.311 h |
| February | 31.7°C19.9°C | 19.9°C | 11 | 2.4 | 11.612 h |
| March | 34.0°C23.2°C | 23.2°C | 34 | 5.9 | 12.012 h |
| April | 34.9°C25.2°C | 25.2°C | 65 | 10.7 | 12.512 h |
| May | 33.4°C25.4°C | 25.4°C | 152 | 20.1 | 12.913 h |
| June | 32.4°C25.4°C | 25.4°C | 134 | 19.1 | 13.113 h |
| July | 31.7°C25.0°C | 25.0°C | 164 | 20.2 | 13.013 h |
| August | 30.8°C24.5°C | 24.5°C | 214 | 23.3 | 12.713 h |
| September, selected | 30.1°C23.8°C | 23.8°C | 237 | 23.3 | 12.212 h |
| October | 29.6°C22.5°C | 22.5°C | 104 | 12.8 | 11.812 h |
| November | 29.4°C20.6°C | 20.6°C | 24 | 3.5 | 11.411 h |
| December | 28.3°C18.3°C | 18.3°C | 5.1 | 1.0 | 11.211 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
September in nearby cities
- Udon Thani in SeptemberThailand · 108 kmHigh 29.9°C · Low 23.7°C · 276 mm rain
- Sakon Nakhon in SeptemberThailand · 161 kmHigh 29.7°C · Low 23.7°C · 268 mm rain
- Vientiane in SeptemberLaos · 171 kmHigh 29.6°C · Low 23.8°C · 300 mm rain
- Nakhon Ratchasima in SeptemberThailand · 182 kmHigh 30.3°C · Low 23.7°C · 231 mm rain
- Savannakhet in SeptemberLaos · 206 kmHigh 29.4°C · Low 23.3°C · 257 mm rain
- Thakhèk in SeptemberLaos · 238 kmHigh 29.4°C · Low 23.1°C · 317 mm rain
- Ubon Ratchathani in SeptemberThailand · 254 kmHigh 29.9°C · Low 23.8°C · 273 mm rain
- Nakhon Sawan in SeptemberThailand · 300 kmHigh 31.1°C · Low 24.6°C · 272 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Khon Kaen) is explained once on the Khon Kaen year overview and on the Sources, method and limits page.