nomadseason

September Weather in Brattleboro, United States

Last updated: June 24, 2025

In September, the average temperature in Brattleboro, United States is a pleasant 18°C (64°F). While you might experience a minimum of 0°C (32°F), the days can warm up to a maximum of 33°C (91°F). Expect around 90 mm (3.5 in) of precipitation spread over 8 days, contributing to an average humidity level of 72%. Enjoy the diverse weather this month offers!

September Temperature in Brattleboro

In September in Brattleboro, the average temperature is 18°C (64°F). Maximum temperatures can reach 33°C (91°F), while minimums can dip as low as 0°C (32°F). This diverse range of temperatures makes it advisable for travelers to pack layers for varying weather conditions.

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

The chart illustrates September temperature patterns in Brattleboro, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brattleboro, September typically has an average temperature of 18°C (64°F), with highs reaching up to 33°C (91°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec262934465868737164533930
Data source: Temperature data for Brattleboro generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Brattleboro

In Brattleboro in September, the precipitation amount is 90 mm (3.5 in) spread over 8 days, indicating a relatively wet period for the region.

September Precipitation Trends in Brattleboro

The chart displays monthly precipitation patterns in Brattleboro, 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 Brattleboro, September typically receives around 90 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec77907613089761239090148100116
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Brattleboro

In Brattleboro in September, humidity is 72%. With an average temperature of 18°C (64°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable as the air clings to your skin, leaving you longing for a refreshing breeze.

September Average Humidity in Brattleboro

This chart illustrates the average monthly humidity levels in Brattleboro, 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 Brattleboro is approximately 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brattleboro

In Brattleboro in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Brattleboro.

Maximum UV Index Levels in Brattleboro for September

The chart shows the monthly maximum UV Index (UVI) for Brattleboro 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 Brattleboro typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468910997632
Data source: Brattleboro 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 Brattleboro Compares to Other Months

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

This table compares monthly weather conditions in Brattleboro, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (26°F)77 mm (3.0 inches)89%moderate
February Weather-2°C (29°F)90 mm (3.5 inches)88%moderate
March Weather1°C (35°F)76 mm (3.0 inches)86%high
April Weather8°C (46°F)130 mm (5.1 inches)84%very high
May Weather14°C (58°F)88 mm (3.5 inches)76%very high
June Weather20°C (68°F)76 mm (3.0 inches)72%very high
July Weather23°C (73°F)123 mm (4.9 inches)66%very high
August Weather22°C (71°F)90 mm (3.6 inches)64%very high
September Weather18°C (64°F)90 mm (3.5 inches)72%high
October Weather11°C (53°F)148 mm (5.8 inches)81%high
November Weather4°C (39°F)100 mm (3.9 inches)87%moderate
December Weather-1°C (30°F)116 mm (4.6 inches)84%low

Compare Brattleboro's Climate with Cities Worldwide