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September Weather in Rochelle, United States

Last updated: June 24, 2025

In September, the average temperature in Rochelle, United States is a pleasant 20°C (68°F). While you can expect minimums as low as 2°C (36°F) and maximums reaching up to 34°C (94°F), there's also a notable precipitation of 112 mm (4.4 in) over 10 days. With an average humidity level of 80%, it's a perfect time to embrace the unique climate of this vibrant location!

September Temperature in Rochelle

In September in Rochelle, the average temperature is 20°C (68°F). The maximum can reach 34°C (94°F), and the minimum can be as low as 2°C (36°F). This diverse range of temperatures makes it advisable to pack both light clothing for warm days and warmer layers for cooler nights when traveling.

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

The chart illustrates September temperature patterns in Rochelle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Rochelle, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (94°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec232539486172757367533832
Data source: Temperature data for Rochelle generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Rochelle

In Rochelle in September, the total precipitation amount is 112 mm (4.4 in) over the course of 10 days.

September Precipitation Trends in Rochelle

The chart displays monthly precipitation patterns in Rochelle, 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 Rochelle, September typically receives around 112 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec60577710816812579761121195148
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Rochelle

In Rochelle in September, humidity is 80%. With an average temperature of 20°C (68°F), this humidity feels like traveling through a warm, dense blanket that clings to your skin, making you feel both sticky and lethargic as you explore the sights.

September Average Humidity in Rochelle

This chart illustrates the average monthly humidity levels in Rochelle, 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 Rochelle is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Rochelle

In Rochelle in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Rochelle.

Maximum UV Index Levels in Rochelle for September

The chart shows the monthly maximum UV Index (UVI) for Rochelle 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 Rochelle typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098632
Data source: Rochelle 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 Rochelle Compares to Other Months

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

This table compares monthly weather conditions in Rochelle, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)60 mm (2.3 inches)82%moderate
February Weather-4°C (26°F)57 mm (2.2 inches)83%moderate
March Weather4°C (39°F)77 mm (3.0 inches)84%high
April Weather9°C (48°F)108 mm (4.3 inches)85%very high
May Weather16°C (61°F)168 mm (6.6 inches)79%very high
June Weather22°C (72°F)125 mm (4.9 inches)82%very high
July Weather24°C (76°F)79 mm (3.1 inches)80%very high
August Weather23°C (73°F)76 mm (3.0 inches)81%very high
September Weather20°C (68°F)112 mm (4.4 inches)80%very high
October Weather12°C (54°F)119 mm (4.7 inches)82%high
November Weather3°C (38°F)51 mm (2.0 inches)88%moderate
December Weather0°C (32°F)48 mm (1.9 inches)84%low

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