Climate averages 1991–2020
Lafayette (Indiana), United States weather
in September.
A warm, moderately 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 warm month in Lafayette (Indiana), United States: daytime highs average 24.5°C and nights cool to about 14.7°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 68 mm of rain on roughly 8 days, which makes September a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 30 min on an average September day.
The nearest other city in this atlas is Carmel (81 km away). In September its highs average 24.2°C, about as warm as Lafayette (Indiana), United States, with 69 mm of rain.
Among the 498 cities listed in the United States, Lafayette (Indiana), United States ranks joint 329th of 498 for the warmest September highs and joint 204th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Lafayette (Indiana), United States is 2.4°C cooler than that mean.
From September to October, average highs fall by 6.8°C to 17.7°C, and monthly rainfall rises from 68 mm to 79 mm.
The annual picture
September in context
Monthly precipitation
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 (Indiana), United States climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 1.1°C-6.8°C | -6.8°C | 70 | 9.1 | 9.610 h |
| February | 3.7°C-5.4°C | -5.4°C | 59 | 8.2 | 10.611 h |
| March | 9.7°C-0.4°C | -0.4°C | 84 | 10.4 | 11.912 h |
| April | 16.4°C5.7°C | 5.7°C | 109 | 11.7 | 13.313 h |
| May | 21.9°C11.9°C | 11.9°C | 109 | 13.3 | 14.414 h |
| June | 26.4°C17.0°C | 17.0°C | 110 | 12.8 | 15.015 h |
| July | 28.1°C19.0°C | 19.0°C | 92 | 11.2 | 14.715 h |
| August | 27.6°C18.4°C | 18.4°C | 82 | 9.8 | 13.814 h |
| September, selected | 24.5°C14.7°C | 14.7°C | 68 | 8.1 | 12.513 h |
| October | 17.7°C8.5°C | 8.5°C | 79 | 9.0 | 11.211 h |
| November | 10.0°C2.0°C | 2.0°C | 78 | 8.5 | 10.010 h |
| December | 3.7°C-3.6°C | -3.6°C | 64 | 9.2 | 9.39 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
- Carmel in SeptemberUnited States · 81 kmHigh 24.2°C · Low 14.8°C · 69 mm rain
- Fishers in SeptemberUnited States · 89 kmHigh 24.4°C · Low 14.8°C · 69 mm rain
- Indianapolis in SeptemberUnited States · 94 kmHigh 24.6°C · Low 15.2°C · 72 mm rain
- Champaign in SeptemberUnited States · 121 kmHigh 24.7°C · Low 14.9°C · 77 mm rain
- Muncie in SeptemberUnited States · 129 kmHigh 23.9°C · Low 14.4°C · 67 mm rain
- Gary in SeptemberUnited States · 137 kmHigh 22.8°C · Low 15.8°C · 79 mm rain
- Hammond in SeptemberUnited States · 140 kmHigh 22.9°C · Low 15.7°C · 77 mm rain
- Bloomington (Indiana), United States in SeptemberUnited States · 142 kmHigh 25.3°C · Low 15.6°C · 73 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 (Indiana), United States year overview and on the Sources, method and limits page.