September weather forecastBrattleboro, VT
September
Weather in September
In September, Brattleboro, Vermont, fully embraces autumn with cooler temperatures, diminishing daylight hours, and increased cloud cover. Temperature highs settle at an agreeable 70.2°F (21.2°C) and lows averaging 50.9°F (10.5°C), hinting at the impending winter. This change in the weather landscape invites an array of autumnal colors while reducing rainfall as compared to summer months. The weather in September offers a pleasant mix of warmth and chill, creating quintessential autumnal conditions.Temperature
September brings a slight decrease in the average high-temperature, shifting from a warm 77.9°F (25.5°C) in August to an agreeable 70.2°F (21.2°C). In Brattleboro, the expected average low-temperature for September is a fresh 50.9°F (10.5°C).Humidity
In Brattleboro, the average relative humidity in September is 79%.Rainfall
The month with the least rainfall is September, when the rain falls for 6.8 days and typically collects 0.43" (11mm) of precipitation.Snowfall
May through September are months without snowfall.Daylight
In Brattleboro, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:15 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:47 am and sunset at 6:32 pm EDT.
Sunshine
In September, the average sunshine is 8.6h.UV index
In Brattleboro, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: In September, an average UV index of 4 transforms into the following instructions:
Preventative actions are necessary - The mandate to avoid skin and eye damage is in place. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Brattleboro, VT
- Average high temperature in September: 70.2°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (27.9°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in September
Brattleboro, VT
- Average pressure in September: 30.06"Hg
The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Brattleboro, VT
- Average wind speed in September: 5.3mph
The windiest months (with the highest average wind speed) are January, February and March (7.8mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).
Average humidity in September
Brattleboro, VT
- Average humidity in September: 79%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (74%).
Average rainfall in September
Brattleboro, VT
- Average rainfall in September: 0.43"
The wettest month (with the highest rainfall) is November (0.87").
The driest month (with the least rainfall) is September (0.43").
Average rainfall days in September
Brattleboro, VT
- Average rainfall days in September: 6.8 days
The month with the highest number of rainy days is May (10 days).
The months with the least rainy days are January and February (4.3 days).
Average snowfall in September
Brattleboro, VT
- Average snowfall in September: 0"
The month with the highest snowfall is January (1.81").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Brattleboro, VT
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Brattleboro, VT
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in September: 8h and 36min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 24min).
Average sunshine days in September
Brattleboro, VT
- Average sunshine days in September: 20.5 days
The month with the most sunshine days is January (21.9 days).
The month with the least sunshine days is July (17.6 days).
Average UV index in September
Brattleboro, VT
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Brattleboro, VT
- Average cloud cover in September: 37
The month with the most cloud cover is February (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 34).
Average visibility in September
Brattleboro, VT
- Average visibility in September: 5mi
The months with the highest visibility are April, November and December (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September and October (5mi).
