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September Weather in Blue River, United States

Last updated: June 24, 2025

In September, the average temperature in Blue River, United States hovers around 7°C (46°F), with a potential range of -11°C (13°F) to 22°C (72°F). Expect about 43 mm (1.7 in) of precipitation spread over 9 days, contributing to an average humidity level of 65%. Stay prepared for a mix of chilly and mild weather as the month unfolds!

September Temperature in Blue River

In September in Blue River, the average temperature is 7°C (46°F). The maximum can reach 22°C (72°F), while the minimum can drop as low as -11°C (13°F). Be sure to prepare for a wide range of temperatures during your travels!

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

The chart illustrates September temperature patterns in Blue River, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Blue River, September typically has an average temperature of 7°C (46°F), with highs reaching up to 22°C (72°F) and lows dropping to around -11°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec131422273546525145302013
Data source: Temperature data for Blue 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 Blue River

In Blue River in September, the precipitation amount reaches 43 mm (1.7 in) over the course of 9 days.

September Precipitation Trends in Blue River

The chart displays monthly precipitation patterns in Blue 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 Blue River, September typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec415967788150835343564143
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Blue River

In Blue River in September, humidity is 65%. With an average temperature of 7°C (46°F), this humidity feels like a chilly dampness that clings to your skin, making travel uncomfortable unless you're well-prepared with layers and a waterproof jacket.

September Average Humidity in Blue River

This chart illustrates the average monthly humidity levels in Blue 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 Blue River is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%81%76%67%58%52%56%65%76%82%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Blue River

In Blue River in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Blue River.

Maximum UV Index Levels in Blue River for September

The chart shows the monthly maximum UV Index (UVI) for Blue 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 Blue River typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469121314131211754
Data source: Blue 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 Blue River Compares to Other Months

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

This table compares monthly weather conditions in Blue River, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-11°C (13°F)41 mm (1.6 inches)88%moderate
February Weather-10°C (14°F)59 mm (2.3 inches)87%high
March Weather-5°C (22°F)67 mm (2.7 inches)81%very high
April Weather-3°C (27°F)78 mm (3.1 inches)76%extreme
May Weather2°C (35°F)81 mm (3.2 inches)66%extreme
June Weather8°C (46°F)50 mm (2.0 inches)58%extreme
July Weather11°C (53°F)83 mm (3.3 inches)52%extreme
August Weather11°C (52°F)53 mm (2.1 inches)56%extreme
September Weather7°C (46°F)43 mm (1.7 inches)65%extreme
October Weather-1°C (31°F)56 mm (2.2 inches)76%high
November Weather-7°C (20°F)41 mm (1.6 inches)82%moderate
December Weather-11°C (13°F)43 mm (1.7 inches)89%moderate

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