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September Weather in Brookville, United States

Last updated: June 24, 2025

In September, the average temperature in Brookville, United States is a pleasant 18°C (64°F). Expect minimums to dip to 2°C (35°F) and maximums to rise to a warm 31°C (88°F). With an average precipitation of 124 mm (4.9 in) spread across 11 days, the air tends to be fairly humid, sitting at an average of 67%. Embrace the varied weather and enjoy the charm of this destination!

September Temperature in Brookville

In September in Brookville, the average temperature is 18°C (64°F). Maximums can reach 31°C (88°F), and minimums can drop as low as 2°C (35°F). Whether you're exploring the great outdoors or enjoying the local culture, be prepared for a diverse range of weather conditions for your travels.

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 18°C (64°F), with highs reaching up to 31°C (88°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec273037475967727064543933
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 124 mm (4.9 in) over the course of 11 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 124 mm (4.9 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec100120105136153138127106125130102107
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 67%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making travel quite comfortable but slightly sticky, encouraging lightweight clothing and the occasional refreshing break in the shade.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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-3°C (27°F)100 mm (3.9 inches)89%moderate
February Weather-1°C (31°F)120 mm (4.7 inches)90%moderate
March Weather3°C (38°F)105 mm (4.1 inches)89%high
April Weather9°C (48°F)136 mm (5.4 inches)88%very high
May Weather15°C (59°F)153 mm (6.0 inches)80%very high
June Weather19°C (67°F)138 mm (5.4 inches)79%very high
July Weather22°C (72°F)127 mm (5.0 inches)74%very high
August Weather21°C (70°F)106 mm (4.2 inches)64%very high
September Weather18°C (64°F)124 mm (4.9 inches)67%very high
October Weather12°C (54°F)130 mm (5.1 inches)81%high
November Weather4°C (39°F)102 mm (4.0 inches)89%moderate
December Weather0°C (33°F)107 mm (4.2 inches)88%low

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