Weather in Rockford, Illinois for September 2025
Until now, September 2025 in Rockford is cooler than usual, with temperatures averaging 22.4 °F, this is -3.5 °F below the typical seasonal average.
The forecast for the upcoming days in Rockford predicts a temperature of 29.7 °F, which is slightly above the historical average.
In general, the average temperature in Rockford at the beginning of September is 25.9 °F. As the month progressed, temperatures tended to significantly warm up, reaching an average of 29.7 °F by the end of September.
The climate of Rockford in September is notably wet, with an average of 11 rainy days, and a total of 62.6 mm of precipitation.
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Rockford Weather September
Temperatures trend during September in Rockford
September weather in Rockford day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 |  Sunny | 26° /10° | 0 mm | 6 | |
| Sept. 2 |  Mist | 28° /10° | 0 mm | 6 | |
| Sept. 3 |  Partly cloudy | 28° /11° | 10.8 mm | 7 | |
| Sept. 4 |  Cloudy | 27° /12° | 0 mm | 6 | |
| Sept. 5 |  Overcast | 28° /15° | 1 mm | 6 | |
| Sept. 6 |  Patchy rain possible | 23° /9° | 1.3 mm | 5 | |
| Sept. 7 | Patchy rain possible | 21° /6° | 0.2 mm | 5 | |
| Sept. 8 | Mist | 23° /6° | 0 mm | 6 | |
| Sept. 9 | Mist | 27° /8° | 0 mm | 6 | |
| Sept. 10 | Fog | 28° /11° | 0 mm | 6 | |
| Sept. 11 | Light rain shower | 25° /13° | 4.6 mm | 6 | |
| Sept. 12 | Fog | 26° /12° | 0 mm | 6 | |
| Sept. 13 | Mist | 27° /14° | 0 mm | 6 | |
| Sept. 14 | Mist | 29° /12° | 0 mm | 6 | |
| Sept. 15 | Sunny | 32° /15° | 0 mm | 1.5 | |
| Sept. 16 | Sunny | 31° /14° | 0 mm | 1.4 | |
| Sept. 17 | Sunny | 30° /11° | 0 mm | 1.4 | |
| Sept. 18 | Sunny | 30° /16° | 0 mm | 1.4 | |
| Sept. 19 | Sunny | 27° /14° | 0 mm | 0 | |
| Sept. 20 | Sunny | 27° /14° | 0 mm | 5 | |
| Sept. 21 | Patchy rain possible | 27° /16° | 2.3 mm | 4 | |
| Sept. 22 | Partly cloudy | 25° /17° | 0.1 mm | 6 | |
| Sept. 23 |  Moderate rain | 29° /18° | 5.3 mm | 5 | |
| Sept. 24 | Patchy rain possible | 28° /16° | 0.5 mm | 5 | |
| Sept. 25 | Sunny | 30° /16° | 0 mm | 6 | |
| Sept. 26 | Sunny | 31° /17° | 0 mm | 6 | |
| Sept. 27 | Sunny | 34° /20° | 0 mm | 7 | |
| Sept. 28 | Sunny | 35° /20° | 0 mm | 7 | |
| Sept. 29 | Mist | 22° /12° | 0 mm | 5 | |
| Sept. 30 |  Thundery outbreaks possible | 28° /15° | 0 mm | 6 | |
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Rockford in September - FAQ
September rainfall patterns in Rockford
UV exposure in Rockford during September
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Where is Rockford?Get accurate weather forecasts for Rockford, located at latitude 42.271 and longitude -89.094. Stay updated with localized weather information tailored for Rockford.