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September Weather in Iron River, United States

Last updated: June 24, 2025

In September, the average temperature in Iron River, United States is a pleasant 14°C (58°F). However, be prepared for a range of weather, with temperatures dipping as low as -3°C (27°F) and soaring up to 32°C (89°F). Expect 96 mm (3.8 in) of precipitation over about 11 days, contributing to a somewhat humid atmosphere with an average humidity of 78%.

September Temperature in Iron River

In September in Iron River, the average temperature is 14°C (58°F). The maximum can reach 32°C (89°F), while the minimum can drop as low as -3°C (27°F). Be prepared for a wide range of temperatures when traveling to Iron River during this month, ensuring you pack accordingly.

September Weather in Iron River: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Iron River, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Iron River, September typically has an average temperature of 14°C (58°F), with highs reaching up to 32°C (89°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec151527375364686458442920
Data source: Temperature data for Iron River 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 Iron River

In Iron River in September, the precipitation amount is 96 mm (3.8 in) spread over 11 days, resulting in a significant accumulation of rainfall.

September Precipitation Trends in Iron River

The chart displays monthly precipitation patterns in Iron River, 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 Iron River, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec34514791809498110961095358
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Iron River

In Iron River in September, humidity is 78%. With an average temperature of 14°C (58°F), this humidity feels like a damp embrace, making traveling a bit uncomfortable as the air clings to your skin, causing you to sweat more than usual while exploring.

September Average Humidity in Iron River

This chart illustrates the average monthly humidity levels in Iron River, 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 Iron River is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Iron River

In Iron River 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 Iron River.

Maximum UV Index Levels in Iron River for September

The chart shows the monthly maximum UV Index (UVI) for Iron River 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 Iron River typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458810997532
Data source: Iron River 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 Iron River Compares to Other Months

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

This table compares monthly weather conditions in Iron River, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-9°C (15°F)34 mm (1.3 inches)89%low
February Weather-10°C (15°F)51 mm (2.0 inches)90%moderate
March Weather-3°C (27°F)47 mm (1.8 inches)87%moderate
April Weather3°C (38°F)91 mm (3.6 inches)84%very high
May Weather12°C (53°F)80 mm (3.2 inches)77%very high
June Weather18°C (64°F)94 mm (3.7 inches)75%very high
July Weather20°C (69°F)98 mm (3.9 inches)74%very high
August Weather18°C (65°F)110 mm (4.3 inches)73%very high
September Weather14°C (58°F)96 mm (3.8 inches)78%high
October Weather7°C (44°F)109 mm (4.3 inches)84%moderate
November Weather-2°C (29°F)53 mm (2.1 inches)89%moderate
December Weather-6°C (21°F)57 mm (2.3 inches)87%low

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