Last updated: June 24, 2025
In September, the average temperature in Winnebago, United States is a pleasant 19°C (66°F). Visitors can expect temperature variations ranging from a cool 2°C (37°F) to a warm 33°C (92°F). This month also sees an average precipitation of 115 mm (4.5 in) spread over 9 days, contributing to a relatively high average humidity of 75%.
In September in Winnebago, the average temperature is 19°C (66°F), with maximums reaching up to 33°C (92°F) and minimums dipping as low as 2°C (37°F). It's essential to pack layers and be prepared for both warm days and cool evenings while traveling during this time.
In Winnebago in September, the precipitation amount is 115 mm (4.5 in) over the course of 9 days, indicating a relatively wet period for the region.
In Winnebago in September humidity is 75%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making it slightly uncomfortable for traveling as you navigate through the thick, muggy air.
In Winnebago 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 Winnebago.
UV Risk Categories
Weather in Winnebago varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Winnebago, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (18°F) | 35 mm (1.4 inches) | 82% | moderate |
| February Weather | -8°C (17°F) | 39 mm (1.5 inches) | 84% | moderate |
| March Weather | 1°C (34°F) | 71 mm (2.8 inches) | 80% | moderate |
| April Weather | 7°C (45°F) | 93 mm (3.7 inches) | 81% | very high |
| May Weather | 16°C (60°F) | 144 mm (5.7 inches) | 74% | very high |
| June Weather | 22°C (73°F) | 120 mm (4.7 inches) | 80% | very high |
| July Weather | 23°C (75°F) | 115 mm (4.5 inches) | 80% | very high |
| August Weather | 22°C (71°F) | 109 mm (4.3 inches) | 77% | very high |
| September Weather | 19°C (66°F) | 115 mm (4.5 inches) | 75% | very high |
| October Weather | 9°C (49°F) | 92 mm (3.6 inches) | 80% | moderate |
| November Weather | 2°C (35°F) | 35 mm (1.4 inches) | 87% | moderate |
| December Weather | -3°C (26°F) | 42 mm (1.7 inches) | 83% | moderate |