September weather forecast
Bolton, CT

Grass, brown sand, and trees on an empty beach in Bolton, Connecticut, overlooking the blue waters far out
Grass, brown sand, and trees on an empty beach in Bolton, Connecticut, overlooking the blue waters far out

Weather in September

September, the first month of the autumn in Bolton, is still a warm month, with temperature in the range of an average high of 73.4°F (23°C) and an average low of 55.2°F (12.9°C).

Temperature

In Bolton, Connecticut, the average high-temperature in September marginally drops from a warm 81°F (27.2°C) in August to a still moderately hot 73.4°F (23°C). In September, in Bolton, the average low-temperature is 55.2°F (12.9°C).

Humidity

The average relative humidity in September is 77%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.5 days and accumulates 1.77" (45mm) of precipitation.

Snowfall

June through September are months without snowfall in Bolton.

Daylight

In Bolton, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:15 am and sunset at 7:23 pm. On the last day of September, in Bolton, sunrise is at 6:45 am and sunset at 6:33 pm EDT.

Sunshine

In Bolton, the average sunshine in September is 8.7h.

UV index

In Bolton, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

What is the average humidity in September in Bolton?

In September, the average relative humidity in Bolton is 77%.

What is the driest month in Bolton?

The month with the least rainfall in Bolton is September, when the rain falls for 12.5 days and typically collects 1.77" (45mm) of precipitation.

How much does it rain in Bolton in September?

In September, the rain falls for 12.5 days. Throughout September, 1.77" (45mm) of precipitation is accumulated.

When it does not snow in Bolton?

June through September are months without snowfall in Bolton, Connecticut.

Does it snow in Bolton in September?

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

How many hours of daylight does Bolton have in September?

In September, the average day length in Bolton is 12h and 28min.

When is the sunrise / sunset in September in Bolton?

On the first day of September, sunrise is at 6:15 am and sunset at 7:23 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:33 pm EDT.

How long on average sun shines in September in Bolton?

In September, the average sunshine duration in Bolton, Connecticut, is 8.7h.

How high is the UV index in September in Bolton?

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

Average temperature in September
Bolton, CT

Average temperature in September - Bolton, CT
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (32.9°F).

  • Average low temperature in September: 55.2°F

The month with the highest average low temperature is July (63.5°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).

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Average pressure in September
Bolton, CT

Average pressure in September - Bolton, CT
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Bolton, CT

Average wind speed in September - Bolton, CT
  • Average wind speed in September: 5.8mph

The windiest months (with the highest average wind speed) are January and March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

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Average humidity in September
Bolton, CT

Average humidity in September - Bolton, CT
  • Average humidity in September: 77%

The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (71%).

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Average rainfall in September
Bolton, CT

Average rainfall in September - Bolton, CT
  • Average rainfall in September: 1.77"

The wettest month (with the highest rainfall) is December (3.27").
The driest month (with the least rainfall) is September (1.77").

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Average rainfall days in September
Bolton, CT

Average rainfall days in September - Bolton, CT
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (10 days).

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Average snowfall in September
Bolton, CT

Average snowfall in September - Bolton, CT
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.8").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Bolton, CT

Average snowfall days in September - Bolton, CT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (8.5 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
Bolton, CT

Average daylight in September / Average sunshine in September - Bolton, CT
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 10min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in September: 8h and 42min

The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in September
Bolton, CT

Average sunshine days in September - Bolton, CT
  • Average sunshine days in September: 14.6 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (11.2 days).

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Average UV index in September
Bolton, CT

Average UV index in September - Bolton, CT
  • Average UV index in September: 4

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in September
Bolton, CT

Average cloud cover in September - Bolton, CT
  • Average cloud cover in September: 37

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in September
Bolton, CT

Average visibility in September - Bolton, CT
  • Average visibility in September: 5mi

The months with the highest visibility are January, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are February, May and September (5mi).

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