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September Weather in Superior, United States

Last updated: June 24, 2025

In September, the average temperature in Superior, United States is a pleasant 22°C (71°F). Temperatures can range from a cool 4°C (39°F) to a sizzling 37°C (99°F). Expect about 68 mm (2.7 in) of precipitation spread over 6 days, contributing to an average humidity of 73%.

September Temperature in Superior

In September in Superior, the average temperature is 22°C (71°F), with maximums reaching 37°C (99°F) and minimums dropping as low as 4°C (39°F). This range makes it essential for travelers to pack for both warm days and cooler evenings.

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 22°C (71°F), with highs reaching up to 37°C (99°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec282843526377807671544234
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 precipitation amount is 68 mm (2.7 in) spread over the course of 6 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 68 mm (2.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec2722814517580708468892239
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 22°C (71°F), this humidity feels like a warm blanket enveloping you, making outdoor activities somewhat sticky but still enjoyable for exploring the sights.

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.
JanFebMarAprMayJunJulAugSepOctNovDec75%78%67%70%82%81%80%80%74%71%79%83%
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 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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-2°C (29°F)27 mm (1.1 inches)74%moderate
February Weather-2°C (29°F)22 mm (0.9 inches)78%moderate
March Weather6°C (43°F)81 mm (3.2 inches)67%high
April Weather11°C (52°F)45 mm (1.8 inches)70%very high
May Weather17°C (63°F)175 mm (6.9 inches)82%very high
June Weather25°C (77°F)80 mm (3.1 inches)81%extreme
July Weather26°C (80°F)70 mm (2.8 inches)80%extreme
August Weather24°C (76°F)84 mm (3.3 inches)80%very high
September Weather22°C (71°F)68 mm (2.7 inches)73%very high
October Weather12°C (54°F)89 mm (3.5 inches)71%high
November Weather6°C (42°F)22 mm (0.9 inches)79%moderate
December Weather1°C (34°F)39 mm (1.5 inches)83%moderate

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