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September Weather in Brownsburg, United States

Last updated: June 24, 2025

In Brownsburg, United States during the month of September, the average temperature hovers around 21°C (70°F). Be prepared for varied conditions, as temperatures can dip to a cool 6°C (42°F) or soar up to a blistering 33°C (92°F). Expect about 74 mm (2.9 in) of precipitation spread across 6 days, with an average humidity level of 69%. Stay comfortable and plan accordingly!

September Temperature in Brownsburg

In September in Brownsburg, the average temperature is 21°C (70°F). The maximum can reach 33°C (92°F), while the minimum can be as low as 6°C (42°F). This wide temperature range makes it essential for travelers to pack layers to accommodate both warm days and cool nights.

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

The chart illustrates September temperature patterns in Brownsburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brownsburg, September typically has an average temperature of 21°C (70°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec303343526473777470574136
Data source: Temperature data for Brownsburg 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 Brownsburg

In Brownsburg in September, the total precipitation amount is 74 mm (2.9 in), spread over a period of 6 days.

September Precipitation Trends in Brownsburg

The chart displays monthly precipitation patterns in Brownsburg, 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 Brownsburg, September typically receives around 74 mm (2.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec829112496137114108105741088981
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Brownsburg

In Brownsburg in September humidity is 69%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making outdoor activities enjoyable but requiring occasional breaks for hydration and shade during your travels.

September Average Humidity in Brownsburg

This chart illustrates the average monthly humidity levels in Brownsburg, 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 Brownsburg is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brownsburg

In Brownsburg 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 Brownsburg.

Maximum UV Index Levels in Brownsburg for September

The chart shows the monthly maximum UV Index (UVI) for Brownsburg 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 Brownsburg typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
Data source: Brownsburg 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 Brownsburg Compares to Other Months

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

This table compares monthly weather conditions in Brownsburg, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)82 mm (3.2 inches)87%moderate
February Weather1°C (34°F)91 mm (3.6 inches)85%moderate
March Weather6°C (43°F)124 mm (4.9 inches)86%high
April Weather11°C (52°F)96 mm (3.8 inches)84%very high
May Weather18°C (65°F)137 mm (5.4 inches)79%very high
June Weather23°C (74°F)114 mm (4.5 inches)82%extreme
July Weather25°C (77°F)108 mm (4.2 inches)79%very high
August Weather23°C (74°F)105 mm (4.1 inches)70%very high
September Weather21°C (70°F)74 mm (2.9 inches)69%very high
October Weather14°C (58°F)108 mm (4.2 inches)76%high
November Weather5°C (42°F)89 mm (3.5 inches)88%moderate
December Weather2°C (36°F)81 mm (3.2 inches)87%moderate

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