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September Weather in Cottage Grove, United States

Last updated: June 24, 2025

In September, the average temperature in Cottage Grove, United States is a pleasant 17°C (63°F). Expect a range with a minimum of 3°C (38°F) and a peak of 37°C (100°F). During this month, precipitation typically amounts to 88 mm (3.4 in) over about 7 days, while the average humidity hovers around 66%.

September Temperature in Cottage Grove

In September in Cottage Grove, the average temperature is 17°C (63°F). The maximum can reach 37°C (100°F) and the minimum can be as low as 3°C (38°F). Be prepared for a wide range of temperatures when traveling to Cottage Grove during this time.

September Weather in Cottage Grove: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Cottage Grove, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cottage Grove, September typically has an average temperature of 17°C (63°F), with highs reaching up to 37°C (100°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec414044495562686963524540
Data source: Temperature data for Cottage Grove 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 Cottage Grove

In Cottage Grove in September, the precipitation amount is 88 mm (3.4 in) over the course of 7 days.

September Precipitation Trends in Cottage Grove

The chart displays monthly precipitation patterns in Cottage Grove, 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 Cottage Grove, September typically receives around 88 mm (3.4 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec16220915615272512788102144177
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cottage Grove

In Cottage Grove in September, humidity is 66%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making travel refreshing yet slightly muggy, perfect for leisurely strolls or picturesque outdoor explorations, but travelers should be prepared for occasional discomfort as they navigate the vibrant sights.

September Average Humidity in Cottage Grove

This chart illustrates the average monthly humidity levels in Cottage Grove, 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 Cottage Grove is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cottage Grove

In Cottage Grove in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Cottage Grove.

Maximum UV Index Levels in Cottage Grove for September

The chart shows the monthly maximum UV Index (UVI) for Cottage Grove 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 Cottage Grove typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246710101098532
Data source: Cottage Grove 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 Cottage Grove Compares to Other Months

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

This table compares monthly weather conditions in Cottage Grove, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)162 mm (6.4 inches)84%low
February Weather5°C (40°F)209 mm (8.2 inches)85%moderate
March Weather7°C (44°F)156 mm (6.1 inches)86%high
April Weather10°C (49°F)152 mm (6.0 inches)83%high
May Weather13°C (56°F)72 mm (2.8 inches)83%very high
June Weather17°C (62°F)51 mm (2.0 inches)83%very high
July Weather20°C (69°F)2 mm (0.1 inches)78%very high
August Weather21°C (69°F)7 mm (0.3 inches)67%very high
September Weather17°C (63°F)88 mm (3.4 inches)66%very high
October Weather11°C (52°F)102 mm (4.0 inches)77%moderate
November Weather7°C (45°F)144 mm (5.7 inches)87%moderate
December Weather5°C (40°F)177 mm (7.0 inches)87%low

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