Climate averages 1991–2020
Lafayette (Louisiana), United States weather
in September.
A hot, wet month: the 4th warmest and the joint 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a hot month in Lafayette (Louisiana), United States: daytime highs average 30.3°C and nights cool to about 22.0°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 96 mm of rain on roughly 11 days, which makes September a wet month (the joint 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 Baton Rouge (84 km away). In September its highs average 30.1°C, about as warm as Lafayette (Louisiana), United States, with 100 mm of rain.
Among the 498 cities listed in the United States, Lafayette (Louisiana), United States ranks joint 104th of 498 for the warmest September highs and joint 377th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Lafayette (Louisiana), United States is 3.4°C warmer than that mean.
From September to October, average highs fall by 3.8°C to 26.4°C, and monthly rainfall stays at 96 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
Lafayette (Louisiana), United States climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 16.1°C7.2°C | 7.2°C | 127 | 9.5 | 10.410 h |
| February | 18.2°C9.0°C | 9.0°C | 107 | 8.9 | 11.111 h |
| March | 21.4°C12.1°C | 12.1°C | 109 | 10.1 | 12.012 h |
| April | 24.9°C15.6°C | 15.6°C | 109 | 9.1 | 12.913 h |
| May | 28.9°C20.0°C | 20.0°C | 92 | 9.7 | 13.714 h |
| June | 31.3°C23.2°C | 23.2°C | 114 | 14.2 | 14.114 h |
| July | 31.8°C24.3°C | 24.3°C | 124 | 17.4 | 13.914 h |
| August | 32.1°C24.2°C | 24.2°C | 121 | 16.1 | 13.213 h |
| September, selected | 30.3°C22.0°C | 22.0°C | 96 | 11.2 | 12.412 h |
| October | 26.4°C17.1°C | 17.1°C | 96 | 7.7 | 11.511 h |
| November | 21.0°C11.7°C | 11.7°C | 90 | 8.2 | 10.711 h |
| December | 17.3°C8.5°C | 8.5°C | 112 | 9.2 | 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
- Baton Rouge in SeptemberUnited States · 84 kmHigh 30.1°C · Low 21.8°C · 100 mm rain
- Lake Charles in SeptemberUnited States · 114 kmHigh 30.3°C · Low 21.9°C · 121 mm rain
- Metairie in SeptemberUnited States · 182 kmHigh 29.1°C · Low 23.5°C · 118 mm rain
- New Orleans in SeptemberUnited States · 189 kmHigh 28.9°C · Low 23.5°C · 123 mm rain
- Beaumont in SeptemberUnited States · 201 kmHigh 30.2°C · Low 22.0°C · 136 mm rain
- Gulfport in SeptemberUnited States · 281 kmHigh 28.8°C · Low 22.9°C · 144 mm rain
- Jackson in SeptemberUnited States · 289 kmHigh 30.4°C · Low 19.9°C · 83 mm rain
- Baytown in SeptemberUnited States · 290 kmHigh 30.3°C · Low 22.2°C · 129 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 Lafayette) is explained once on the Lafayette (Louisiana), United States year overview and on the Sources, method and limits page.