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September Weather in Upper Brookville, United States

Last updated: June 24, 2025

In September, the average temperature in Upper Brookville, United States typically hovers around 21°C (70°F). While you can enjoy pleasant days, be prepared for cooler moments, with temperatures dipping to a minimum of 11°C (52°F) and soaring to a high of 29°C (85°F). Expect 96 mm (3.8 in) of rainfall over approximately 10 days, contributing to an average humidity level of 68%.

September Temperature in Upper Brookville

In September in Upper Brookville, the average temperature is 21°C (70°F), with a maximum that can reach 29°C (85°F) and a minimum that can dip to 11°C (52°F). This pleasant weather makes it an ideal time for travelers to explore the area comfortably.

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

The chart illustrates September temperature patterns in Upper Brookville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Upper Brookville, September typically has an average temperature of 21°C (70°F), with highs reaching up to 29°C (85°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec353640495868767570614840
Data source: Temperature data for Upper 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 Upper Brookville

In Upper Brookville in September, the total precipitation amount is 96 mm (3.8 in) over a span of 10 days.

September Precipitation Trends in Upper Brookville

The chart displays monthly precipitation patterns in Upper 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 Upper Brookville, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec821201051291259013711896145102134
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Upper Brookville

In Upper Brookville in September humidity is 68%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making the air feel slightly heavy and sticky, which can be quite exhausting for travelers.

September Average Humidity in Upper Brookville

This chart illustrates the average monthly humidity levels in Upper 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 Upper Brookville is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Upper Brookville

In Upper 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 Upper Brookville.

Maximum UV Index Levels in Upper Brookville for September

The chart shows the monthly maximum UV Index (UVI) for Upper 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 Upper Brookville typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Upper 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 Upper Brookville Compares to Other Months

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

This table compares monthly weather conditions in Upper Brookville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)82 mm (3.2 inches)84%moderate
February Weather2°C (36°F)120 mm (4.7 inches)82%moderate
March Weather5°C (41°F)105 mm (4.1 inches)81%high
April Weather9°C (49°F)129 mm (5.1 inches)78%very high
May Weather14°C (58°F)125 mm (4.9 inches)69%very high
June Weather20°C (69°F)90 mm (3.6 inches)69%very high
July Weather24°C (76°F)137 mm (5.4 inches)62%very high
August Weather24°C (75°F)118 mm (4.7 inches)65%very high
September Weather21°C (70°F)96 mm (3.8 inches)68%very high
October Weather16°C (61°F)145 mm (5.7 inches)74%high
November Weather9°C (48°F)102 mm (4.0 inches)82%moderate
December Weather5°C (40°F)134 mm (5.3 inches)80%low

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