nomadseason

September Weather in Rockford, United States

Last updated: June 24, 2025

In September, the average temperature in Rockford, United States is a pleasant 25°C (77°F). You can expect a range with minimums dipping to 12°C (54°F) and maximums soaring to 37°C (98°F). Throughout the month, anticipate around 88 mm (3.5 in) of precipitation over 9 days, with an average humidity of 73% making it feel quite comfortable.

September Temperature in Rockford

In September in Rockford, the average temperature is 25°C (77°F). Maximums can reach 37°C (98°F) and minimums can be as low as 12°C (54°F). It's an ideal time for travelers seeking warm weather while also enjoying some cooler evenings.

September Weather in Rockford: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Rockford, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rockford, September typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (98°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec485459647277808077685450
Data source: Temperature data for Rockford generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Rockford

In Rockford in September, the precipitation amount is 88 mm (3.5 in) over the course of 9 days.

September Precipitation Trends in Rockford

The chart displays monthly precipitation patterns in Rockford, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Rockford, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1131561291421261501101208811983140
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Rockford

In Rockford in September humidity is 73%. With an average temperature of 25°C (77°F), this humidity feels like a warm blanket wrapping around you, making travel a bit sticky but also vibrant and lively, as the air carries the rich scents of the surrounding environment.

September Average Humidity in Rockford

This chart illustrates the average monthly humidity levels in Rockford, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Rockford is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rockford

In Rockford in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Rockford.

Maximum UV Index Levels in Rockford for September

The chart shows the monthly maximum UV Index (UVI) for Rockford in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Rockford typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119764
Data source: Rockford September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Rockford Compares to Other Months

Weather in Rockford varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Rockford, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Rockford, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)113 mm (4.5 inches)85%moderate
February Weather12°C (54°F)156 mm (6.1 inches)84%high
March Weather15°C (59°F)129 mm (5.1 inches)82%very high
April Weather18°C (64°F)142 mm (5.6 inches)82%very high
May Weather22°C (73°F)126 mm (5.0 inches)81%extreme
June Weather25°C (78°F)150 mm (5.9 inches)77%extreme
July Weather27°C (81°F)110 mm (4.3 inches)77%extreme
August Weather27°C (80°F)120 mm (4.7 inches)72%extreme
September Weather25°C (77°F)88 mm (3.5 inches)73%very high
October Weather20°C (69°F)119 mm (4.7 inches)73%high
November Weather12°C (55°F)83 mm (3.3 inches)85%high
December Weather10°C (51°F)140 mm (5.5 inches)88%moderate

Compare Rockford's Climate with Cities Worldwide