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September Weather in Superior, United States

Last updated: June 24, 2025

In Superior, United States, the average temperature in September hovers around 13°C (55°F). However, be prepared for some fluctuations, as temperatures can dip as low as -5°C (24°F) and soar to a maximum of 33°C (91°F). Expect 41 mm (1.6 in) of precipitation over approximately 8 days, accompanied by an average humidity of 62%.

September Temperature in Superior

In September in Superior, the average temperature is 13°C (55°F), with maximums reaching 33°C (91°F) and minimums dropping as low as -5°C (24°F). It's advisable to pack layers and prepare for a wide range of weather conditions while traveling.

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

The chart illustrates September temperature patterns in Superior, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Superior, September typically has an average temperature of 13°C (55°F), with highs reaching up to 33°C (91°F) and lows dropping to around -5°C (24°F).
JanFebMarAprMayJunJulAugSepOctNovDec252332394958676655413327
Data source: Temperature data for Superior 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 Superior

In Superior in September, the total precipitation amount is 41 mm (1.6 in) occurring over the course of 8 days.

September Precipitation Trends in Superior

The chart displays monthly precipitation patterns in Superior, 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 Superior, September typically receives around 41 mm (1.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7111775888465202941859592
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Superior

In Superior in September, humidity is 62%. With an average temperature of 13°C (55°F), this humidity feels like a cool, crisp embrace that can make outdoor activities refreshing yet somewhat damp, ideal for exploring but requiring a light jacket to stay comfortable.

September Average Humidity in Superior

This chart illustrates the average monthly humidity levels in Superior, 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 Superior is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%89%87%84%78%78%77%64%62%79%87%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Superior

In Superior in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Superior.

Maximum UV Index Levels in Superior for September

The chart shows the monthly maximum UV Index (UVI) for Superior 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 Superior typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246710101097532
Data source: Superior 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 Superior Compares to Other Months

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

This table compares monthly weather conditions in Superior, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)71 mm (2.8 inches)89%low
February Weather-5°C (23°F)117 mm (4.6 inches)89%moderate
March Weather0°C (33°F)75 mm (2.9 inches)87%high
April Weather4°C (39°F)87 mm (3.4 inches)84%high
May Weather10°C (50°F)84 mm (3.3 inches)77%very high
June Weather14°C (58°F)65 mm (2.6 inches)78%very high
July Weather19°C (67°F)20 mm (0.8 inches)77%very high
August Weather19°C (66°F)29 mm (1.1 inches)64%very high
September Weather13°C (55°F)41 mm (1.6 inches)62%high
October Weather5°C (41°F)85 mm (3.4 inches)79%moderate
November Weather1°C (33°F)95 mm (3.7 inches)87%moderate
December Weather-3°C (27°F)92 mm (3.6 inches)90%low

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