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September Weather in Superior, United States

Last updated: August 27, 2025

In September, the average temperature in Superior, United States hovers around 16°C (62°F). Expect a range where the minimum dips to 4°C (39°F) and the maximum soars to 26°C (80°F). With 119 mm (4.7 in) of precipitation over approximately 12 days, it's wise to prepare for some wet weather. The average humidity sits at a comfortable 73%, creating a refreshing atmosphere for your visits.

September Temperature in Superior

In September in Superior, the average temperature is 16°C (62°F), with maximums reaching up to 26°C (80°F) and minimums dipping as low as 4°C (39°F). This diverse range makes it an ideal time for travelers to enjoy a variety of outdoor activities and explore the local culture.

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 16°C (62°F), with highs reaching up to 26°C (80°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec141427354758666762483323
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 119 mm (4.7 in), falling over a span of 12 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 119 mm (4.7 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec253453749476961091191535267
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 73%. With an average temperature of 16°C (62°F), this humidity feels like a warm embrace, making outdoor activities slightly uncomfortable but still bearable for travelers who enjoy a lush, vibrant atmosphere.

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 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%93%89%85%76%71%70%71%73%82%88%91%
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.
JanFebMarAprMayJunJulAugSepOctNovDec234789987532
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-10°C (15°F)25 mm (1.0 inches)93%low
February Weather-10°C (14°F)33 mm (1.3 inches)93%moderate
March Weather-3°C (28°F)53 mm (2.1 inches)89%moderate
April Weather2°C (35°F)74 mm (2.9 inches)85%high
May Weather8°C (47°F)94 mm (3.7 inches)76%very high
June Weather15°C (59°F)76 mm (3.0 inches)71%very high
July Weather19°C (66°F)95 mm (3.8 inches)70%very high
August Weather19°C (67°F)109 mm (4.3 inches)71%very high
September Weather16°C (62°F)119 mm (4.7 inches)73%high
October Weather9°C (48°F)153 mm (6.0 inches)81%moderate
November Weather1°C (34°F)52 mm (2.0 inches)87%moderate
December Weather-5°C (23°F)67 mm (2.6 inches)91%low

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