Last updated: June 24, 2025
In September, the average temperature in Cottage Grove, United States hovers around 18°C (64°F). Expect a range where minimums can dip to 1°C (35°F) and maximums soar to 33°C (91°F). Be prepared for some rain, as the region receives an average precipitation of 118 mm (4.7 in) over approximately 9 days. With an average humidity level of 81%, it’s a month that feels both warm and a touch tropical!
In September in Cottage Grove, the average temperature is 18°C (64°F). Maximums can reach 33°C (91°F), and minimums can be as low as 1°C (35°F). Travelers should be prepared for a range of temperatures and pack accordingly for both warm days and cooler evenings.
In Cottage Grove in September, the precipitation amount is 118 mm (4.7 in), occurring over a span of 9 days.
In Cottage Grove in September, humidity is 81%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel both refreshing and slightly stifling at the same time.
In Cottage Grove 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 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 | -8°C (17°F) | 31 mm (1.2 inches) | 87% | low |
| February Weather | -8°C (17°F) | 39 mm (1.5 inches) | 90% | moderate |
| March Weather | 1°C (33°F) | 61 mm (2.4 inches) | 85% | moderate |
| April Weather | 6°C (44°F) | 87 mm (3.4 inches) | 84% | high |
| May Weather | 15°C (59°F) | 143 mm (5.6 inches) | 78% | very high |
| June Weather | 22°C (71°F) | 103 mm (4.0 inches) | 80% | very high |
| July Weather | 23°C (75°F) | 108 mm (4.2 inches) | 81% | very high |
| August Weather | 21°C (71°F) | 124 mm (4.9 inches) | 81% | very high |
| September Weather | 18°C (64°F) | 118 mm (4.7 inches) | 81% | high |
| October Weather | 9°C (49°F) | 97 mm (3.8 inches) | 84% | moderate |
| November Weather | 1°C (34°F) | 38 mm (1.5 inches) | 88% | moderate |
| December Weather | -5°C (24°F) | 52 mm (2.0 inches) | 84% | low |