The highest day temperature in September 2026 was 85°F. The lowest night temperature was 40°F. The average values for day and night temperatures during September were 69.9°F и 55.3°F respectivly.

You can expect various weather conditions during September. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in September for Brattleboro is 1.3 in.

The average wind speed in September is 4.8 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Brattleboro in September is 6.7 hours.