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September Weather in Lake Wisconsin, United States

Last updated: June 24, 2025

In Lake Wisconsin, United States, the average temperature in September hovers around 18°C (65°F). Expect a range that can dip to a minimum of 2°C (36°F) and soar to a maximum of 33°C (91°F). During this month, precipitation averages at 113 mm (4.4 in) spread over 9 days, contributing to an average humidity level of 79%.

September Temperature in Lake Wisconsin

In September in Lake Wisconsin, the average temperature is 18°C (65°F), with maximums reaching 33°C (91°F) and minimums dropping as low as 2°C (36°F). This makes Lake Wisconsin an ideal destination for travelers seeking a mix of comfortable days and cooler evenings.

September Weather in Lake Wisconsin: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Lake Wisconsin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lake Wisconsin, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec212235455970747164513628
Data source: Temperature data for Lake Wisconsin 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 Lake Wisconsin

In Lake Wisconsin in September, the precipitation amount is 113 mm (4.4 in) over a period of 9 days.

September Precipitation Trends in Lake Wisconsin

The chart displays monthly precipitation patterns in Lake Wisconsin, 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 Lake Wisconsin, September typically receives around 113 mm (4.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec49545894131116921081131184444
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lake Wisconsin

In Lake Wisconsin 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.

September Average Humidity in Lake Wisconsin

This chart illustrates the average monthly humidity levels in Lake Wisconsin, 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 Lake Wisconsin is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lake Wisconsin

In Lake Wisconsin 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 Lake Wisconsin.

Maximum UV Index Levels in Lake Wisconsin for September

The chart shows the monthly maximum UV Index (UVI) for Lake Wisconsin 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 Lake Wisconsin typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101098532
Data source: Lake Wisconsin 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 Lake Wisconsin Compares to Other Months

Weather in Lake Wisconsin varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Lake Wisconsin, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Lake Wisconsin, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)49 mm (1.9 inches)85%moderate
February Weather-6°C (22°F)54 mm (2.1 inches)85%moderate
March Weather2°C (36°F)57 mm (2.3 inches)85%moderate
April Weather7°C (46°F)94 mm (3.7 inches)85%very high
May Weather15°C (59°F)131 mm (5.2 inches)78%very high
June Weather21°C (70°F)116 mm (4.6 inches)80%very high
July Weather23°C (74°F)92 mm (3.6 inches)78%very high
August Weather22°C (71°F)108 mm (4.3 inches)76%very high
September Weather18°C (65°F)113 mm (4.4 inches)79%very high
October Weather10°C (51°F)118 mm (4.6 inches)83%moderate
November Weather2°C (36°F)43 mm (1.7 inches)88%moderate
December Weather-2°C (29°F)44 mm (1.7 inches)81%low

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