Climate averages 1991–2020
Davenport weather
in September.
A warm, moderately wet month: the 4th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Davenport: daytime highs average 23.8°C and nights cool to about 14.8°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 88 mm of rain on roughly 8 days, which makes September a moderately wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 31 min on an average September day.
The nearest other city in this atlas is Iowa City (81 km away). In September its highs average 23.7°C, about as warm as Davenport, with 99 mm of rain.
Among the 498 cities listed in the United States, Davenport ranks joint 366th of 498 for the warmest September highs and joint 324th of 498 for the driest September (rainfall, lowest first). The mean September high of those 498 cities is 26.9°C; Davenport is 3.1°C cooler than that mean.
From September to October, average highs fall by 7.1°C to 16.7°C, and monthly rainfall falls from 88 mm to 70 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
Davenport climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.9°C-9.3°C | -9.3°C | 46 | 7.6 | 9.510 h |
| February | 1.8°C-7.2°C | -7.2°C | 49 | 6.7 | 10.611 h |
| March | 8.9°C-0.9°C | -0.9°C | 70 | 9.5 | 11.912 h |
| April | 15.6°C5.5°C | 5.5°C | 108 | 12.0 | 13.313 h |
| May | 21.6°C12.0°C | 12.0°C | 119 | 12.8 | 14.514 h |
| June | 26.6°C17.5°C | 17.5°C | 118 | 11.9 | 15.115 h |
| July | 28.5°C19.9°C | 19.9°C | 91 | 10.1 | 14.915 h |
| August | 27.6°C19.0°C | 19.0°C | 90 | 9.2 | 13.814 h |
| September, selected | 23.8°C14.8°C | 14.8°C | 88 | 8.3 | 12.513 h |
| October | 16.7°C8.2°C | 8.2°C | 70 | 8.5 | 11.111 h |
| November | 8.8°C1.1°C | 1.1°C | 61 | 7.8 | 9.910 h |
| December | 1.9°C-5.4°C | -5.4°C | 53 | 7.2 | 9.29 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
- Iowa City in SeptemberUnited States · 81 kmHigh 23.7°C · Low 14.2°C · 99 mm rain
- Cedar Rapids in SeptemberUnited States · 104 kmHigh 23.2°C · Low 13.7°C · 100 mm rain
- Peoria (Illinois), United States in SeptemberUnited States · 124 kmHigh 24.4°C · Low 15.4°C · 76 mm rain
- Rockford in SeptemberUnited States · 148 kmHigh 22.8°C · Low 13.7°C · 84 mm rain
- Bloomington (Illinois), United States in SeptemberUnited States · 176 kmHigh 24.3°C · Low 14.8°C · 77 mm rain
- Aurora (Illinois), United States in SeptemberUnited States · 189 kmHigh 23.2°C · Low 14.1°C · 77 mm rain
- Madison in SeptemberUnited States · 198 kmHigh 22.1°C · Low 13.1°C · 84 mm rain
- Elgin in SeptemberUnited States · 199 kmHigh 23.1°C · Low 14.3°C · 78 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 Davenport) is explained once on the Davenport year overview and on the Sources, method and limits page.