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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 8°C (46°F), with a minimum of -9°C (15°F) and a pleasant maximum of 18°C (64°F). Expect 162 mm (6.4 in) of precipitation spread over 19 days, contributing to a high average humidity of 96%. Prepare for a mix of chilly air and damp conditions!

September Temperature in Eagle River

In September in Eagle River, the average temperature is 8°C (46°F). The maximum can reach 18°C (64°F), and the minimum can drop as low as -9°C (15°F). Travelers should be prepared for a wide range of temperatures and dress accordingly.

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 8°C (46°F), with highs reaching up to 18°C (64°F) and lows dropping to around -9°C (15°F).
JanFebMarAprMayJunJulAugSepOctNovDec141721334352575446352020
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 162 mm (6.4 in) over a span of 19 days.

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 162 mm (6.4 inches) of precipitation spread over approximately 19 days.
JanFebMarAprMayJunJulAugSepOctNovDec9878827094102113157162203143170
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 96%. With an average temperature of 8°C (46°F), this humidity feels like a heavy blanket enveloping you, making even short walks feel sluggish and uncomfortable for traveling.

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 96%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec94%93%91%85%88%95%102%100%96%91%95%96%
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 reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Eagle River for better planning.

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 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123466754211
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-10°C (14°F)98 mm (3.9 inches)94%low
February Weather-8°C (18°F)78 mm (3.1 inches)93%low
March Weather-6°C (21°F)82 mm (3.2 inches)91%moderate
April Weather1°C (33°F)70 mm (2.8 inches)85%moderate
May Weather6°C (43°F)94 mm (3.7 inches)88%high
June Weather11°C (52°F)101 mm (4.0 inches)95%high
July Weather14°C (57°F)113 mm (4.4 inches)102%high
August Weather12°C (54°F)157 mm (6.2 inches)100%moderate
September Weather8°C (46°F)162 mm (6.4 inches)96%moderate
October Weather2°C (35°F)203 mm (8.0 inches)91%low
November Weather-7°C (20°F)143 mm (5.6 inches)95%low
December Weather-6°C (21°F)170 mm (6.7 inches)96%low

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