September weather forecast
Willimantic, CT

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Weather in September

The first month of the autumn, September, is still a pleasant month in Willimantic, Connecticut, with an average temperature ranging between max 73.2°F (22.9°C) and min 55.4°F (13°C).

Temperature

With the arrival of September, Willimantic experiences a modest decline in average high-temperatures, transitioning from a warm 80.2°F (26.8°C) in August to a pleasant 73.2°F (22.9°C). Nighttime temperature lowers to an average of 55.4°F (13°C) in September.

Humidity

In Willimantic, the average relative humidity in September is 78%.

Rainfall

The month with the least rainfall in Willimantic is September, when the rain falls for 13.5 days and typically collects 1.73" (44mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

The average length of the day in September in Willimantic is 12h and 28min.
On the first day of September in Willimantic, sunrise is at 6:15 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:31 pm EDT.

Sunshine

In September, the average sunshine in Willimantic is 8.6h.

UV index

In Willimantic, Connecticut, 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 the average person.
Note: An average UV index of 4 in September transforms into this advice:
Undertake precautions - It is suggested to shield oneself from sunburn. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
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Frequently asked questions

What is the average September temperature in Willimantic?

September temperatures vary between a high-temperature of 73.2°F (22.9°C) and a low-temperature of 55.4°F (13°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in July is computed to be 87.8°F (31°C).

What is the average humidity in September in Willimantic?

In Willimantic, the average relative humidity in September is 78%.

What is the driest month in Willimantic?

September is the month with the least rainfall in Willimantic. Rain falls for 13.5 days and accumulates 1.73" (44mm) of precipitation.

How many days does it rain in September in Willimantic?

In Willimantic, in September, during 13.5 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow in Willimantic?

In Willimantic, snow does not fall in June through October.

How many hours of daylight does Willimantic have in September?

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

What time are sunrise and sunset in September in Willimantic?

On the first day of September in Willimantic, Connecticut, sunrise is at 6:15 am and sunset at 7:21 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:31 pm EDT.

How long on average sun shines in September in Willimantic?

The average sunshine duration in September is 8.6h.

What is the UV index reading in September in Willimantic?

The average daily maximum UV index in September in Willimantic is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
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
Willimantic, CT

Average temperature in September - Willimantic, CT
  • Average high temperature in September: 73.2°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 55.4°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).

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Average pressure in September
Willimantic, CT

Average pressure in September - Willimantic, CT
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.08"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Willimantic, CT

Average wind speed in September - Willimantic, CT
  • Average wind speed in September: 6.2mph

The windiest months (with the highest average wind speed) are January and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in September
Willimantic, CT

Average humidity in September - Willimantic, CT
  • Average humidity in September: 78%

The months with the highest relative humidity are February and October (79%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in September
Willimantic, CT

Average rainfall in September - Willimantic, CT
  • Average rainfall in September: 1.73"

The wettest month (with the highest rainfall) is December (3.46").
The driest month (with the least rainfall) is September (1.73").

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Average rainfall days in September
Willimantic, CT

Average rainfall days in September - Willimantic, CT
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (9.1 days).

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Average snowfall in September
Willimantic, CT

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

The month with the highest snowfall is March (4.41").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Willimantic, CT

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

The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Willimantic, CT

Average daylight in September / Average sunshine in September - Willimantic, CT
  • Average daylight in September: 12h and 3min

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

  • 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 December (Average sunshine: 4h and 42min).

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Average sunshine days in September
Willimantic, CT

Average sunshine days in September - Willimantic, 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 (10.8 days).

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Average UV index in September
Willimantic, CT

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

The months with the highest UV index are June, July and August (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
Willimantic, CT

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

The months with the most cloud cover are February, March, May and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in September
Willimantic, CT

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

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

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Willimantic, Connecticut, USA

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