Last updated: June 24, 2025
In September, the average temperature in Appleton, United States is a pleasant 17°C (64°F). However, be prepared for a range, with minimum temperatures dipping to 1°C (35°F) and maximums soaring up to 33°C (93°F). Expect some rain, as 82 mm (3.2 in) of precipitation is typically spread over 9 days. Moreover, the average humidity sits at a high 82%, adding a touch of tropical feel to the air.
In September in Appleton, the average temperature is 17°C (64°F), with maximums reaching 33°C (93°F) and minimums dropping as low as 1°C (35°F). This makes it an ideal time to visit, as you can enjoy pleasant days while being prepared for cooler nights.
In Appleton in September, the total precipitation amount is 82 mm (3.2 in), occurring over a span of 9 days.
In Appleton in September, humidity is 82%. With an average temperature of 17°C (64°F), this humidity feels like a damp embrace that can make traveling quite uncomfortable, as the sticky air clings to your skin and leaves you yearning for a cool breeze.
In Appleton 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 Appleton.
UV Risk Categories
Weather in Appleton varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Appleton, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -10°C (14°F) | 20 mm (0.8 inches) | 85% | moderate |
| February Weather | -10°C (15°F) | 18 mm (0.7 inches) | 89% | moderate |
| March Weather | 0°C (31°F) | 47 mm (1.9 inches) | 81% | moderate |
| April Weather | 5°C (42°F) | 66 mm (2.6 inches) | 82% | high |
| May Weather | 15°C (58°F) | 92 mm (3.6 inches) | 76% | very high |
| June Weather | 22°C (72°F) | 84 mm (3.3 inches) | 81% | very high |
| July Weather | 23°C (74°F) | 101 mm (4.0 inches) | 82% | very high |
| August Weather | 21°C (70°F) | 135 mm (5.3 inches) | 83% | very high |
| September Weather | 17°C (64°F) | 82 mm (3.2 inches) | 82% | high |
| October Weather | 8°C (48°F) | 82 mm (3.2 inches) | 82% | moderate |
| November Weather | 1°C (33°F) | 25 mm (1.0 inches) | 87% | moderate |
| December Weather | -5°C (23°F) | 36 mm (1.4 inches) | 84% | low |