September weather forecast
Brattleboro, VT

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A hilly landscape in Brattleboro, Vermont, with scenic light green vegetation around the old buildings and cascades
A hilly landscape in Brattleboro, Vermont, with scenic light green vegetation around the old buildings and cascades

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's arrival in Brattleboro aligns with a minor decrease in average high-temperatures, from August's moderately hot 77.9°F (25.5°C) to a pleasant 70.2°F (21.2°C). In Brattleboro, an average low-temperature of 50.9°F (10.5°C) is recorded during September nights.

Humidity

In September, the average relative humidity in Brattleboro is 79%.

Rainfall

The month with the least rainfall in Brattleboro 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 in Brattleboro.

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, in Brattleboro, sunrise is at 6:47 am and sunset at 6:32 pm EDT.

Sunshine

In September, the average sunshine in Brattleboro, Vermont, is 8.6h.

UV index

In Brattleboro, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: In September, a regular UV index of 4 translates into these guidelines:
Ensure safety - Sun damage prevention is strongly urged. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Employ a hat with a wide brim for robust protection, cutting UV exposure by half.
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Frequently asked questions

What is the usual temperature for Brattleboro in September?

The high-temperature, in September, in Brattleboro, records 70.2°F (21.2°C), while the low-temperature is 50.9°F (10.5°C).

What is the average humidity in September in Brattleboro?

In Brattleboro, Vermont, the average relative humidity in September is 79%.

What is the driest month in Brattleboro?

The month with the least rainfall in Brattleboro is September, when the rain falls for 6.8 days and typically collects 0.43" (11mm) of precipitation.

How much does it rain in Brattleboro in September?

In Brattleboro, during September, the rain falls for 6.8 days and regularly aggregates up to 0.43" (11mm) of precipitation.

When it does not snow in Brattleboro?

In Brattleboro, Vermont, snow does not fall in May through September.

Does it snow in Brattleboro in September?

In Brattleboro, Vermont, in September, it doesn't snow. In October, it regularly snows.

How many hours of daylight does Brattleboro have in September?

The average day length in September in Brattleboro is 12h and 29min.

What time are sunrise and sunset in September in Brattleboro?

On the first day of September in Brattleboro, Vermont, sunrise is at 6:15 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:32 pm EDT.

How many hours of sunshine does Brattleboro have in September?

In September, the average sunshine duration in Brattleboro is 8.6h.

How high is the UV index in September in Brattleboro?

In Brattleboro, Vermont, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Brattleboro, VT

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).

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Average pressure in September
Brattleboro, VT

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).

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Average wind speed in September
Brattleboro, VT

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).

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Average humidity in September
Brattleboro, VT

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%).

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Average rainfall in September
Brattleboro, VT

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").

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Average rainfall days in September
Brattleboro, VT

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).

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Average snowfall in September
Brattleboro, VT

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").

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Average snowfall days in September
Brattleboro, VT

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).

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Average daylight in September /
Average sunshine in September
Brattleboro, VT

Average daylight in September / Average sunshine in September - Brattleboro, VT
  • Average daylight in September: 12h and 3min

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 4min

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).

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Average sunshine days in September
Brattleboro, VT

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).

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Average UV index in September
Brattleboro, VT

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).

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Average cloud cover in September
Brattleboro, VT

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).

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Average visibility in September
Brattleboro, VT

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).

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Brattleboro, Vermont, USA

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