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September Weather in Monona, United States

Last updated: June 24, 2025

In {Monona}, {United States}, the average temperature in {September} is a pleasant 18°C (65°F). However, temperatures can vary widely, dipping to a chilly 3°C (37°F) at night and peaking at a warm 33°C (92°F) during the day. Expect about 118 mm (4.6 in) of rainfall spread over 10 days, contributing to an average humidity of 79%.

September Temperature in Monona

In September in Monona, the average temperature is 18°C (65°F), with maximums that can reach 33°C (92°F) and minimums that can drop to as low as 3°C (37°F). Overall, travelers should be prepared for a range of temperatures, ensuring they pack both warm clothing for the cooler evenings and lighter attire for the hotter days.

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

The chart illustrates September temperature patterns in Monona, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Monona, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (92°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec212236465971757165513629
Data source: Temperature data for Monona generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Monona

In Monona in September, the total precipitation amount is 118 mm (4.6 in) over a span of 10 days.

September Precipitation Trends in Monona

The chart displays monthly precipitation patterns in Monona, 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 Monona, September typically receives around 118 mm (4.6 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec55545999132118901091181174348
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Monona

In Monona 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 Monona

This chart illustrates the average monthly humidity levels in Monona, 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 Monona 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 Monona

In Monona 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 Monona.

Maximum UV Index Levels in Monona for September

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

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

This table compares monthly weather conditions in Monona, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)55 mm (2.1 inches)85%moderate
February Weather-5°C (23°F)54 mm (2.1 inches)85%moderate
March Weather2°C (36°F)59 mm (2.3 inches)85%moderate
April Weather8°C (46°F)99 mm (3.9 inches)85%very high
May Weather15°C (60°F)132 mm (5.2 inches)78%very high
June Weather21°C (71°F)118 mm (4.7 inches)80%very high
July Weather24°C (75°F)90 mm (3.5 inches)78%very high
August Weather22°C (72°F)109 mm (4.3 inches)76%very high
September Weather18°C (65°F)118 mm (4.6 inches)79%very high
October Weather11°C (52°F)117 mm (4.6 inches)83%moderate
November Weather2°C (37°F)43 mm (1.7 inches)88%moderate
December Weather-2°C (30°F)48 mm (1.9 inches)81%low

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