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September Weather in Brookfield, United States

Last updated: June 24, 2025

In Brookfield, United States, the average temperature in September is a pleasant 22°C (71°F). However, temperatures can vary significantly, with minimums dropping to 5°C (41°F) and highs soaring to 34°C (94°F). During this month, expect an average precipitation of 77 mm (3.0 in) spread over approximately 7 days, contributing to an average humidity level of 72%.

September Temperature in Brookfield

In September in Brookfield, the average temperature is 22°C (71°F). The maximum can reach 34°C (94°F) and the minimum can be as low as 5°C (41°F). It's a great time to visit Brookfield for travelers looking for mild weather with a mix of warm and cooler days.

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

The chart illustrates September temperature patterns in Brookfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brookfield, September typically has an average temperature of 22°C (71°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec293145536576797671564236
Data source: Temperature data for Brookfield 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 Brookfield

In Brookfield in September, the precipitation amount is 77 mm (3.0 in) over the course of 7 days.

September Precipitation Trends in Brookfield

The chart displays monthly precipitation patterns in Brookfield, 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 Brookfield, September typically receives around 77 mm (3.0 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec6051111901901359995771195038
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Brookfield

In Brookfield in September humidity is 72%. With an average temperature of 22°C (71°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but potentially sticky, urging travelers to stay hydrated and take breaks in the shade.

September Average Humidity in Brookfield

This chart illustrates the average monthly humidity levels in Brookfield, 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 Brookfield is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brookfield

In Brookfield in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Brookfield.

Maximum UV Index Levels in Brookfield for September

The chart shows the monthly maximum UV Index (UVI) for Brookfield 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 Brookfield typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
Data source: Brookfield 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 Brookfield Compares to Other Months

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

This table compares monthly weather conditions in Brookfield, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)60 mm (2.4 inches)80%moderate
February Weather0°C (32°F)51 mm (2.0 inches)78%moderate
March Weather7°C (45°F)111 mm (4.4 inches)75%high
April Weather12°C (53°F)90 mm (3.5 inches)77%very high
May Weather19°C (66°F)190 mm (7.5 inches)82%very high
June Weather24°C (76°F)135 mm (5.3 inches)83%extreme
July Weather26°C (80°F)99 mm (3.9 inches)81%extreme
August Weather24°C (76°F)95 mm (3.7 inches)78%very high
September Weather22°C (71°F)77 mm (3.0 inches)72%very high
October Weather13°C (56°F)119 mm (4.7 inches)72%high
November Weather6°C (43°F)50 mm (2.0 inches)84%moderate
December Weather2°C (36°F)38 mm (1.5 inches)86%moderate

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