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September Weather in Brookville, United States

Last updated: June 24, 2025

In Brookville, United States, the average temperature in September hovers around 21°C (69°F), with extremes ranging from a chilly 5°C (42°F) to a warm 34°C (93°F). Expect 88 mm (3.5 in) of precipitation spread over approximately 8 days, contributing to an average humidity level of 73%. Enjoy the pleasant weather while staying prepared for the occasional shower!

September Temperature in Brookville

In September in Brookville, the average temperature is 21°C (69°F). Maximums can reach 34°C (93°F), and minimums can be as low as 5°C (42°F). This makes Brookville an ideal destination for travelers looking for mild weather with the possibility of warmer or cooler days.

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

The chart illustrates September temperature patterns in Brookville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brookville, September typically has an average temperature of 21°C (69°F), with highs reaching up to 34°C (93°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec313443526472767369574236
Data source: Temperature data for Brookville 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 Brookville

In Brookville in September, the precipitation amount is 88 mm (3.5 in) over the course of 8 days.

September Precipitation Trends in Brookville

The chart displays monthly precipitation patterns in Brookville, 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 Brookville, September typically receives around 88 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7710312310313714011196891029896
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Brookville

In Brookville in September, humidity is 73%. With an average temperature of 21°C (69°F), this humidity feels like a warm, sticky embrace, making outdoor activities somewhat stifling and travel a bit more challenging, as the air is dense and can leave you feeling fatigued more quickly.

September Average Humidity in Brookville

This chart illustrates the average monthly humidity levels in Brookville, 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 Brookville is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brookville

In Brookville 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 Brookville.

Maximum UV Index Levels in Brookville for September

The chart shows the monthly maximum UV Index (UVI) for Brookville 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 Brookville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Brookville 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 Brookville Compares to Other Months

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

This table compares monthly weather conditions in Brookville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (31°F)77 mm (3.0 inches)88%moderate
February Weather1°C (34°F)103 mm (4.1 inches)88%moderate
March Weather6°C (43°F)122 mm (4.8 inches)87%high
April Weather11°C (52°F)103 mm (4.0 inches)85%very high
May Weather18°C (64°F)137 mm (5.4 inches)81%very high
June Weather22°C (72°F)140 mm (5.5 inches)82%very high
July Weather24°C (76°F)111 mm (4.4 inches)81%very high
August Weather23°C (74°F)96 mm (3.8 inches)73%very high
September Weather21°C (69°F)88 mm (3.5 inches)73%very high
October Weather14°C (58°F)102 mm (4.0 inches)78%high
November Weather5°C (42°F)98 mm (3.8 inches)89%moderate
December Weather2°C (37°F)96 mm (3.8 inches)87%moderate

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