Last updated: June 24, 2025
In {Cottage Grove}, {United States}, the average temperature in {September} is a pleasant 18°C (65°F). However, temperatures can vary widely, dipping to a chilly 3°C (37°F) at night and peaking at a warm 33°C (92°F) during the day. Expect about 118 mm (4.6 in) of rainfall spread over 10 days, contributing to an average humidity of 79%.
In September in Cottage Grove, the average temperature is 18°C (65°F), with maximums that can reach 33°C (92°F) and minimums that can drop to as low as 3°C (37°F). Overall, travelers should be prepared for a range of temperatures, ensuring they pack both warm clothing for the cooler evenings and lighter attire for the hotter days.
In Cottage Grove in September, the total precipitation amount is 118 mm (4.6 in) over a span of 10 days.
In Cottage Grove in September, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.
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.
UV Risk Categories
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.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -6°C (21°F) | 55 mm (2.1 inches) | 85% | moderate |
| February Weather | -5°C (23°F) | 54 mm (2.1 inches) | 85% | moderate |
| March Weather | 2°C (36°F) | 59 mm (2.3 inches) | 85% | moderate |
| April Weather | 8°C (46°F) | 99 mm (3.9 inches) | 85% | very high |
| May Weather | 15°C (60°F) | 132 mm (5.2 inches) | 78% | very high |
| June Weather | 21°C (71°F) | 118 mm (4.7 inches) | 80% | very high |
| July Weather | 24°C (75°F) | 90 mm (3.5 inches) | 78% | very high |
| August Weather | 22°C (72°F) | 109 mm (4.3 inches) | 76% | very high |
| September Weather | 18°C (65°F) | 118 mm (4.6 inches) | 79% | very high |
| October Weather | 11°C (52°F) | 117 mm (4.6 inches) | 83% | moderate |
| November Weather | 2°C (37°F) | 43 mm (1.7 inches) | 88% | moderate |
| December Weather | -2°C (30°F) | 48 mm (1.9 inches) | 81% | low |