Climate averages 1991–2020
Ubon Ratchathani weather
in September.
A hot, very wet month: the joint 9th warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Ubon Ratchathani: daytime highs average 29.9°C and nights cool to about 23.8°C. By daytime temperature it is the joint 9th warmest of the 12 months.
Expect about 273 mm of rain on roughly 26 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 Pakse (103 km away). In September its highs average 28.8°C, 1.1°C cooler than Ubon Ratchathani, with 334 mm of rain.
Among the 46 cities listed in Thailand, Ubon Ratchathani ranks joint 33rd of 46 for the warmest September highs and 37th of 46 for the driest September (rainfall, lowest first). The mean September high of those 46 cities is 30.3°C; Ubon Ratchathani is 0.4°C cooler than that mean.
From September to October, average highs fall by 0.2°C to 29.8°C, and monthly rainfall falls from 273 mm to 124 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
Ubon Ratchathani climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.4°C19.1°C | 19.1°C | 4.7 | 1.4 | 11.311 h |
| February | 32.2°C20.9°C | 20.9°C | 9.9 | 1.9 | 11.612 h |
| March | 34.1°C23.7°C | 23.7°C | 35 | 6.3 | 12.012 h |
| April | 34.5°C25.3°C | 25.3°C | 81 | 12.9 | 12.512 h |
| May | 33.0°C25.4°C | 25.4°C | 181 | 22.4 | 12.813 h |
| June | 31.7°C25.1°C | 25.1°C | 194 | 23.2 | 13.013 h |
| July | 30.9°C24.6°C | 24.6°C | 232 | 26.2 | 12.913 h |
| August | 30.3°C24.3°C | 24.3°C | 270 | 26.9 | 12.613 h |
| September, selected | 29.9°C23.8°C | 23.8°C | 273 | 25.6 | 12.212 h |
| October | 29.8°C22.7°C | 22.7°C | 124 | 15.0 | 11.812 h |
| November | 29.9°C21.4°C | 21.4°C | 31 | 4.7 | 11.411 h |
| December | 29.4°C19.5°C | 19.5°C | 6.3 | 1.3 | 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
- Pakse in SeptemberLaos · 103 kmHigh 28.8°C · Low 23.3°C · 334 mm rain
- Savannakhet in SeptemberLaos · 148 kmHigh 29.4°C · Low 23.3°C · 257 mm rain
- Sakon Nakhon in SeptemberThailand · 227 kmHigh 29.7°C · Low 23.7°C · 268 mm rain
- Siem Reap in SeptemberCambodia · 234 kmHigh 30.3°C · Low 24.5°C · 244 mm rain
- Thakhèk in SeptemberLaos · 242 kmHigh 29.4°C · Low 23.1°C · 317 mm rain
- Khon Kaen in SeptemberThailand · 254 kmHigh 30.1°C · Low 23.8°C · 237 mm rain
- Nakhon Ratchasima in SeptemberThailand · 296 kmHigh 30.3°C · Low 23.7°C · 231 mm rain
- Battambang in SeptemberCambodia · 297 kmHigh 31.2°C · Low 24.5°C · 192 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 Ubon Ratchathani) is explained once on the Ubon Ratchathani year overview and on the Sources, method and limits page.