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September Weather in Eagle River, United States

Last updated: June 24, 2025

In September, the average temperature in Eagle River, United States hovers around 15°C (58°F). Expect a cool minimum of 5°C (40°F) and a comfortable maximum of 25°C (77°F). During this month, you'll likely encounter 96 mm (3.8 in) of precipitation spread across 13 days, with an average humidity of 74% adding a touch of dampness to the air.

September Temperature in Eagle River

In September in Eagle River, the average temperature is 15°C (58°F), with maximums reaching 25°C (77°F) and minimums dipping as low as 5°C (40°F). This pleasant climate makes it an ideal time for travelers to explore the beauty of Eagle River.

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

The chart illustrates September temperature patterns in Eagle River, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Eagle River, September typically has an average temperature of 15°C (58°F), with highs reaching up to 25°C (77°F) and lows dropping to around 5°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec211927344249576258473427
Data source: Temperature data for Eagle 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 Eagle River

In Eagle River in September, the precipitation amount is 96 mm (3.8 in) spread over 13 days, indicating a relatively rainy period.

September Precipitation Trends in Eagle River

The chart displays monthly precipitation patterns in Eagle 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 Eagle River, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec5064517463717193971197679
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Eagle River

In Eagle River in September, humidity is 74%. With an average temperature of 15°C (58°F), this humidity feels like a warm, enveloping blanket, making travel feel both refreshing yet slightly sticky, encouraging you to seek the shade or enjoy water-based activities.

September Average Humidity in Eagle River

This chart illustrates the average monthly humidity levels in Eagle 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 Eagle River 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 Eagle River

In Eagle 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 Eagle River.

Maximum UV Index Levels in Eagle River for September

The chart shows the monthly maximum UV Index (UVI) for Eagle 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 Eagle River typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec234689887421
Data source: Eagle 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 Eagle River Compares to Other Months

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

This table compares monthly weather conditions in Eagle River, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)50 mm (2.0 inches)92%low
February Weather-7°C (19°F)63 mm (2.5 inches)92%moderate
March Weather-3°C (27°F)50 mm (2.0 inches)88%moderate
April Weather1°C (34°F)74 mm (2.9 inches)86%high
May Weather6°C (42°F)63 mm (2.5 inches)78%very high
June Weather9°C (49°F)71 mm (2.8 inches)74%very high
July Weather14°C (57°F)71 mm (2.8 inches)70%very high
August Weather17°C (62°F)93 mm (3.7 inches)71%very high
September Weather15°C (58°F)96 mm (3.8 inches)74%high
October Weather8°C (47°F)119 mm (4.7 inches)81%moderate
November Weather1°C (35°F)76 mm (3.0 inches)86%low
December Weather-3°C (27°F)79 mm (3.1 inches)90%low

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