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September Weather in Beloit, United States

Last updated: June 24, 2025

In September, the average temperature in Beloit, United States hovers around 19°C (67°F). Expect a range from a cool 3°C (38°F) at night to a warm 34°C (93°F) during the day. With an average precipitation of 111 mm (4.4 in) over about 10 days, you might want to carry an umbrella. Additionally, the average humidity sits at a comfortable 77%, making for a pleasantly mild atmosphere.

September Temperature in Beloit

In September in Beloit, the average temperature is 19°C (67°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 3°C (38°F). This climate makes it an ideal destination for travelers seeking a mix of warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Beloit, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Beloit, September typically has an average temperature of 19°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec293239506170747267564135
Data source: Temperature data for Beloit 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 Beloit

In Beloit in September, the precipitation amount is 111 mm (4.4 in) over a span of 10 days.

September Precipitation Trends in Beloit

The chart displays monthly precipitation patterns in Beloit, 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 Beloit, September typically receives around 111 mm (4.4 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec87991041331231341351021111109392
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Beloit

In Beloit in September, humidity is 77%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel slightly more challenging as the air clings to your skin, turning every step into a leisurely stroll through a sauna.

September Average Humidity in Beloit

This chart illustrates the average monthly humidity levels in Beloit, 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 Beloit is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%87%87%81%83%82%76%77%82%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Beloit

In Beloit 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 Beloit.

Maximum UV Index Levels in Beloit for September

The chart shows the monthly maximum UV Index (UVI) for Beloit 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 Beloit typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Beloit 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 Beloit Compares to Other Months

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

This table compares monthly weather conditions in Beloit, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)87 mm (3.4 inches)88%moderate
February Weather0°C (33°F)99 mm (3.9 inches)88%moderate
March Weather4°C (40°F)104 mm (4.1 inches)87%high
April Weather10°C (50°F)133 mm (5.3 inches)87%very high
May Weather16°C (61°F)123 mm (4.8 inches)81%very high
June Weather21°C (70°F)134 mm (5.3 inches)83%very high
July Weather23°C (74°F)135 mm (5.3 inches)82%very high
August Weather22°C (72°F)102 mm (4.0 inches)76%very high
September Weather19°C (67°F)111 mm (4.4 inches)77%very high
October Weather13°C (56°F)110 mm (4.3 inches)82%high
November Weather5°C (41°F)93 mm (3.6 inches)89%moderate
December Weather2°C (35°F)92 mm (3.6 inches)86%low

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