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September Weather in Appleton, United States

Last updated: June 24, 2025

In Appleton, United States, the average temperature in September is a comfortable 17°C (64°F). Be prepared for a range, as temperatures can dip to a chilly 2°C (35°F) or soar up to a warm 32°C (90°F). During this month, expect approximately 74 mm (2.9 in) of precipitation over about 10 days, accompanied by an average humidity level of 78%.

September Temperature in Appleton

In September, in Appleton, the average temperature is 17°C (64°F). The maximum can reach 32°C (90°F), while the minimum can drop as low as 2°C (35°F). Overall, it's a great time to visit for varied weather conditions and outdoor activities.

September Weather in Appleton: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Appleton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Appleton, September typically has an average temperature of 17°C (64°F), with highs reaching up to 32°C (90°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec202033435769737063503527
Data source: Temperature data for Appleton 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 Appleton

In Appleton in September, the precipitation amount is 74 mm (2.9 in) spread over a period of 10 days.

September Precipitation Trends in Appleton

The chart displays monthly precipitation patterns in Appleton, 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 Appleton, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec4149629410410110210574975052
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Appleton

In Appleton in September humidity is 78%. With average temperature 17°C (64°F), this humidity feels like a warm embrace, making travel feel sticky and heavy, as the air wraps around you and the moments spent outdoors leave you longing for a cool respite.

September Average Humidity in Appleton

This chart illustrates the average monthly humidity levels in Appleton, 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 Appleton is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Appleton

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.

Maximum UV Index Levels in Appleton for September

The chart shows the monthly maximum UV Index (UVI) for Appleton 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 Appleton typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3457910997532
Data source: Appleton 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 Appleton Compares to Other Months

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.

This table compares monthly weather conditions in Appleton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)41 mm (1.6 inches)89%moderate
February Weather-7°C (21°F)49 mm (1.9 inches)90%moderate
March Weather1°C (33°F)61 mm (2.4 inches)87%moderate
April Weather6°C (43°F)94 mm (3.7 inches)84%high
May Weather14°C (58°F)104 mm (4.1 inches)77%very high
June Weather20°C (69°F)101 mm (4.0 inches)75%very high
July Weather23°C (74°F)102 mm (4.0 inches)74%very high
August Weather21°C (71°F)105 mm (4.1 inches)73%very high
September Weather17°C (64°F)74 mm (2.9 inches)78%high
October Weather10°C (50°F)97 mm (3.8 inches)84%moderate
November Weather2°C (36°F)50 mm (1.9 inches)89%moderate
December Weather-3°C (27°F)52 mm (2.1 inches)87%low

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