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September Weather in Brook, United States

Last updated: June 24, 2025

In Brook, United States, the average temperature in September hovers around 21°C (69°F), but you can expect a range from a chilly 5°C (42°F) to a warm 34°C (93°F). During this month, precipitation totals about 68 mm (2.7 in) over approximately 8 days, with an average humidity level of 78%. Plan accordingly for a mix of pleasant warmth and occasional dampness!

September Temperature in Brook

In September in Brook, 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 Brook an ideal destination for travelers looking for mild weather with the possibility of warmer or cooler days.

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

The chart illustrates September temperature patterns in Brook, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brook, 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).
JanFebMarAprMayJunJulAugSepOctNovDec283041516373767469574135
Data source: Temperature data for Brook 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 Brook

In Brook in September, the precipitation amount is 68 mm (2.7 in) spread over 8 days.

September Precipitation Trends in Brook

The chart displays monthly precipitation patterns in Brook, 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 Brook, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec7375104106156109105108681227360
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Brook

In Brook in September, humidity is 78%. With an average temperature of 21°C (69°F), this humidity feels like a warm embrace that clings to your skin, making outdoor activities feel more intense and leaving you yearning for refreshing breezes or a cool drink as you explore.

September Average Humidity in Brook

This chart illustrates the average monthly humidity levels in Brook, 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 Brook is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%86%87%81%82%81%79%78%81%89%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brook

In Brook 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 Brook.

Maximum UV Index Levels in Brook for September

The chart shows the monthly maximum UV Index (UVI) for Brook 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 Brook typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Brook 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 Brook Compares to Other Months

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

This table compares monthly weather conditions in Brook, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)73 mm (2.9 inches)85%moderate
February Weather-1°C (30°F)75 mm (3.0 inches)85%moderate
March Weather5°C (42°F)104 mm (4.1 inches)86%high
April Weather10°C (51°F)106 mm (4.2 inches)87%very high
May Weather17°C (64°F)156 mm (6.1 inches)81%very high
June Weather23°C (74°F)109 mm (4.3 inches)82%very high
July Weather25°C (76°F)105 mm (4.2 inches)81%very high
August Weather23°C (74°F)108 mm (4.2 inches)79%very high
September Weather21°C (69°F)68 mm (2.7 inches)78%very high
October Weather14°C (57°F)122 mm (4.8 inches)81%high
November Weather5°C (41°F)73 mm (2.9 inches)89%moderate
December Weather1°C (35°F)60 mm (2.3 inches)86%low

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