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September Weather in Ontonagon, United States

Last updated: June 24, 2025

In September, the average temperature in Ontonagon, United States hovers around 15°C (60°F). Expect a range from a chilly 1°C (33°F) to a warm 31°C (89°F). Rainfall is fairly frequent, with about 92 mm (3.6 in) of precipitation over 13 days. Additionally, be prepared for a humidity level averaging 74%, making for a rather moist atmosphere.

September Temperature in Ontonagon

In September in Ontonagon, the average temperature is 15°C (60°F). Maximums can reach 31°C (89°F), while minimums can dip as low as 1°C (33°F). This variation in temperature makes it essential for travelers to pack layers to enjoy the diverse weather conditions.

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

The chart illustrates September temperature patterns in Ontonagon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ontonagon, September typically has an average temperature of 15°C (60°F), with highs reaching up to 31°C (89°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec181628385364696659463123
Data source: Temperature data for Ontonagon 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 Ontonagon

In Ontonagon in September, the precipitation amount is 92 mm (3.6 in) spread over 13 days.

September Precipitation Trends in Ontonagon

The chart displays monthly precipitation patterns in Ontonagon, 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 Ontonagon, September typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec44605482719077111921187278
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ontonagon

In Ontonagon in September humidity is 74%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace that can make outdoor activities feel slightly stifling, so travelers should be prepared to hydrate frequently and take breaks in the shade.

September Average Humidity in Ontonagon

This chart illustrates the average monthly humidity levels in Ontonagon, 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 Ontonagon is approximately 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%92%88%86%78%74%70%71%74%81%86%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ontonagon

In Ontonagon 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 Ontonagon.

Maximum UV Index Levels in Ontonagon for September

The chart shows the monthly maximum UV Index (UVI) for Ontonagon 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 Ontonagon typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec245789987532
Data source: Ontonagon 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 Ontonagon Compares to Other Months

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

This table compares monthly weather conditions in Ontonagon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (18°F)44 mm (1.7 inches)92%low
February Weather-9°C (17°F)60 mm (2.3 inches)92%moderate
March Weather-2°C (28°F)54 mm (2.1 inches)88%moderate
April Weather3°C (38°F)82 mm (3.2 inches)86%high
May Weather12°C (54°F)71 mm (2.8 inches)78%very high
June Weather18°C (64°F)90 mm (3.5 inches)74%very high
July Weather21°C (69°F)77 mm (3.0 inches)70%very high
August Weather19°C (66°F)111 mm (4.4 inches)71%very high
September Weather15°C (60°F)92 mm (3.6 inches)74%high
October Weather8°C (46°F)118 mm (4.6 inches)81%moderate
November Weather0°C (31°F)72 mm (2.8 inches)86%moderate
December Weather-5°C (24°F)78 mm (3.1 inches)90%low

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