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September Weather in Superior, United States

Last updated: June 24, 2025

In September, the average temperature in Superior, United States hovers around 27°C (80°F). Expect a range where the minimum can dip to 10°C (50°F) and the maximum soars to 39°C (103°F). This month also brings an average precipitation of 44 mm (1.7 in) over 5 days, accompanied by an average humidity level of 64%. Stay prepared for a mix of warmth and occasional showers!

September Temperature in Superior

In September in Superior, the average temperature is 27°C (80°F). The maximum can reach 39°C (103°F) and the minimum can be as low as 10°C (50°F). Be prepared for warm weather, but also pack for cooler evenings during your travels.

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 27°C (80°F), with highs reaching up to 39°C (103°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec485057677485868580685950
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 44 mm (1.7 in) over the course of 5 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 44 mm (1.7 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec596641485895744292945
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 64%. With an average temperature of 27°C (80°F), this humidity feels like a warm, heavy blanket wrapping around you, making outdoor activities feel sticky and a bit exhausting for traveling.

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 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
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 reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469111212121110864
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 Weather9°C (49°F)59 mm (2.3 inches)76%moderate
February Weather10°C (51°F)66 mm (2.6 inches)79%high
March Weather14°C (57°F)41 mm (1.6 inches)67%very high
April Weather19°C (67°F)4 mm (0.2 inches)55%extreme
May Weather23°C (74°F)8 mm (0.3 inches)40%extreme
June Weather29°C (85°F)5 mm (0.2 inches)33%extreme
July Weather30°C (86°F)89 mm (3.5 inches)34%extreme
August Weather29°C (85°F)57 mm (2.2 inches)48%extreme
September Weather27°C (80°F)44 mm (1.7 inches)64%very high
October Weather20°C (69°F)29 mm (1.2 inches)67%very high
November Weather15°C (60°F)29 mm (1.1 inches)77%high
December Weather10°C (50°F)45 mm (1.8 inches)82%moderate

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