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September Weather in Belvidere, United States

Last updated: June 24, 2025

In Belvidere, United States, the average temperature in September hovers around 19°C (67°F), with minimums dipping to 2°C (36°F) and maximums soaring to 33°C (92°F). Precipitation averages 104 mm (4.1 in) over 10 days, contributing to an average humidity of 79%. Enjoy the mild climate while preparing for the occasional shower!

September Temperature in Belvidere

In September in Belvidere, the average temperature is 19°C (67°F), with maximums reaching 33°C (92°F) and minimums dropping as low as 2°C (36°F). This range makes it a great time to visit for those who enjoy mild weather but should be prepared for both warm days and cooler nights.

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

The chart illustrates September temperature patterns in Belvidere, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Belvidere, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec232538476071757266533731
Data source: Temperature data for Belvidere 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 Belvidere

In Belvidere in September, the precipitation amount is 104 mm (4.1 in) over a period of 10 days.

September Precipitation Trends in Belvidere

The chart displays monthly precipitation patterns in Belvidere, 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 Belvidere, September typically receives around 104 mm (4.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec61567110615911082861041154951
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Belvidere

In Belvidere in September, humidity is 79%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit more challenging, as the air is thick and can leave you feeling sluggish during outdoor adventures.

September Average Humidity in Belvidere

This chart illustrates the average monthly humidity levels in Belvidere, 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 Belvidere is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Belvidere

In Belvidere 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 Belvidere.

Maximum UV Index Levels in Belvidere for September

The chart shows the monthly maximum UV Index (UVI) for Belvidere 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 Belvidere typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
Data source: Belvidere 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 Belvidere Compares to Other Months

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

This table compares monthly weather conditions in Belvidere, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)61 mm (2.4 inches)85%moderate
February Weather-4°C (25°F)56 mm (2.2 inches)85%moderate
March Weather3°C (38°F)71 mm (2.8 inches)85%high
April Weather8°C (47°F)106 mm (4.2 inches)85%very high
May Weather16°C (60°F)159 mm (6.3 inches)78%very high
June Weather22°C (71°F)110 mm (4.3 inches)80%very high
July Weather24°C (75°F)82 mm (3.2 inches)78%very high
August Weather22°C (72°F)86 mm (3.4 inches)76%very high
September Weather19°C (67°F)104 mm (4.1 inches)79%very high
October Weather12°C (53°F)115 mm (4.5 inches)83%moderate
November Weather3°C (38°F)49 mm (1.9 inches)88%moderate
December Weather0°C (32°F)51 mm (2.0 inches)81%low

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