Climate averages 1991–2020
Savannakhet weather
in September.
A hot, very wet month: the 8th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Savannakhet: daytime highs average 29.4°C and nights cool to about 23.3°C. By daytime temperature it is the 8th warmest of the 12 months.
Expect about 257 mm of rain on roughly 24 days, which makes September a very wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 14 min on an average September day.
The nearest other city in this atlas is Sakon Nakhon (93 km away). In September its highs average 29.7°C, about as warm as Savannakhet, with 268 mm of rain.
Among the 4 cities listed in Laos, Savannakhet ranks joint 2nd of 4 for the warmest September highs and 1st of 4 for the driest September (rainfall, lowest first). The mean September high of those 4 cities is 29.3°C; Savannakhet is 0.1°C warmer than that mean.
From September to October, average highs fall by 0.1°C to 29.3°C, and monthly rainfall falls from 257 mm to 109 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
Savannakhet climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 28.5°C17.3°C | 17.3°C | 4.4 | 1.1 | 11.311 h |
| February | 30.5°C19.0°C | 19.0°C | 13 | 2.7 | 11.612 h |
| March | 32.9°C22.0°C | 22.0°C | 34 | 5.7 | 12.012 h |
| April | 33.8°C24.2°C | 24.2°C | 66 | 11.0 | 12.513 h |
| May | 32.1°C24.7°C | 24.7°C | 189 | 21.6 | 12.913 h |
| June | 30.7°C24.6°C | 24.6°C | 209 | 23.4 | 13.113 h |
| July | 30.0°C24.2°C | 24.2°C | 278 | 26.0 | 13.013 h |
| August | 29.6°C23.9°C | 23.9°C | 294 | 27.7 | 12.713 h |
| September, selected | 29.4°C23.3°C | 23.3°C | 257 | 24.1 | 12.212 h |
| October | 29.3°C22.1°C | 22.1°C | 109 | 11.7 | 11.812 h |
| November | 29.1°C20.3°C | 20.3°C | 21 | 3.3 | 11.411 h |
| December | 27.7°C17.8°C | 17.8°C | 4.9 | 1.4 | 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
- Sakon Nakhon in SeptemberThailand · 93 kmHigh 29.7°C · Low 23.7°C · 268 mm rain
- Thakhèk in SeptemberLaos · 94 kmHigh 29.4°C · Low 23.1°C · 317 mm rain
- Ubon Ratchathani in SeptemberThailand · 148 kmHigh 29.9°C · Low 23.8°C · 273 mm rain
- Pakse in SeptemberLaos · 196 kmHigh 28.8°C · Low 23.3°C · 334 mm rain
- Khon Kaen in SeptemberThailand · 206 kmHigh 30.1°C · Low 23.8°C · 237 mm rain
- Ba Đồn in SeptemberVietnam · 220 kmHigh 29.6°C · Low 25.1°C · 366 mm rain
- Đồng Hới in SeptemberVietnam · 222 kmHigh 29.4°C · Low 25.5°C · 345 mm rain
- Udon Thani in SeptemberThailand · 230 kmHigh 29.9°C · Low 23.7°C · 276 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 Savannakhet) is explained once on the Savannakhet year overview and on the Sources, method and limits page.