Climate averages 1991–2020
Baton Rouge weather
in September.
A hot, wet month: the 4th warmest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Baton Rouge: daytime highs average 30.1°C and nights cool to about 21.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 100 mm of rain on roughly 11 days, which makes September a wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 22 min on an average September day.
The nearest other city in this atlas is Lafayette (Louisiana), United States (84 km away). In September its highs average 30.3°C, about as warm as Baton Rouge, with 96 mm of rain.
Among the 498 cities listed in the United States, Baton Rouge ranks joint 120th of 498 for the warmest September highs and joint 394th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Baton Rouge is 3.2°C warmer than that mean.
From September to October, average highs fall by 4.0°C to 26.2°C, and monthly rainfall falls from 100 mm to 86 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
Baton Rouge climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 15.9°C6.9°C | 6.9°C | 124 | 9.4 | 10.410 h |
| February | 18.1°C8.7°C | 8.7°C | 115 | 8.9 | 11.111 h |
| March | 21.4°C11.7°C | 11.7°C | 118 | 9.8 | 12.012 h |
| April | 25.0°C15.2°C | 15.2°C | 115 | 8.8 | 12.913 h |
| May | 28.9°C19.5°C | 19.5°C | 105 | 9.5 | 13.714 h |
| June | 31.3°C22.9°C | 22.9°C | 120 | 13.6 | 14.114 h |
| July | 31.9°C24.1°C | 24.1°C | 132 | 17.0 | 13.914 h |
| August | 32.0°C24.0°C | 24.0°C | 133 | 15.7 | 13.213 h |
| September, selected | 30.1°C21.8°C | 21.8°C | 100 | 10.7 | 12.412 h |
| October | 26.2°C16.7°C | 16.7°C | 86 | 7.6 | 11.511 h |
| November | 20.8°C11.3°C | 11.3°C | 89 | 7.7 | 10.611 h |
| December | 17.1°C8.1°C | 8.1°C | 112 | 9.3 | 10.210 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
- Lafayette (Louisiana), United States in SeptemberUnited States · 84 kmHigh 30.3°C · Low 22.0°C · 96 mm rain
- Metairie in SeptemberUnited States · 112 kmHigh 29.1°C · Low 23.5°C · 118 mm rain
- New Orleans in SeptemberUnited States · 120 kmHigh 28.9°C · Low 23.5°C · 123 mm rain
- Lake Charles in SeptemberUnited States · 195 kmHigh 30.3°C · Low 21.9°C · 121 mm rain
- Gulfport in SeptemberUnited States · 201 kmHigh 28.8°C · Low 22.9°C · 144 mm rain
- Jackson in SeptemberUnited States · 227 kmHigh 30.4°C · Low 19.9°C · 83 mm rain
- Beaumont in SeptemberUnited States · 283 kmHigh 30.2°C · Low 22.0°C · 136 mm rain
- Mobile in SeptemberUnited States · 302 kmHigh 29.4°C · Low 22.2°C · 117 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 Baton Rouge) is explained once on the Baton Rouge year overview and on the Sources, method and limits page.