September weather forecast and climate
South Willington, CT

Weather in September

The first month of the autumn, September, is still a warm month in South Willington, Connecticut, with average temperature fluctuating between 54.5°F (12.5°C) and 73.4°F (23°C).

Temperature

In South Willington, the average high-temperature slightly decreases, from 80.1°F (26.7°C) in August, to a still warm 73.4°F (23°C). In South Willington, Connecticut, in September, the average low-temperature is 54.5°F (12.5°C).

Humidity

In September, the average relative humidity in South Willington, Connecticut, is 78%.

Rainfall

The month with the least rainfall is September when the rain falls for 7.9 days and typically collects 0.39" (10mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

In September, the average length of the day in South Willington is 12.5h.

Sunshine

In September, the average sunshine is 8.5h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from the exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in South Willington?

The average high-temperature, in September, in South Willington, Connecticut, is 73.4°F (23°C), while the average low-temperature is 54.5°F (12.5°C).

What is the average humidity in September in South Willington?

In South Willington, Connecticut, the average relative humidity in September is 78%.

How much does it rain in South Willington in September?

In South Willington, in September, it is raining for 7.9 days, with typically 0.39" (10mm) of accumulated precipitation.

What is the driest month in South Willington?

September is the month with the least rainfall. Rain falls for 7.9 days and accumulates 0.39" (10mm) of precipitation.

When it does not snow in South Willington?

June through October are months without snowfall.

How many hours of daylight does South Willington have in September?

In South Willington, the average length of the day in September is 12.5h.

How long on average sun shines in September in South Willington?

In South Willington, Connecticut, the average sunshine in September is 8.5h.

What is the UV index reading in September in South Willington?

In South Willington, Connecticut, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
South Willington, CT

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

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32.4°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in September
South Willington, CT

Average pressure in September - South Willington, CT
  • Average pressure in September: 30.06"

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

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Average wind speed in September
South Willington, CT

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

The windiest months (with the highest average wind speed) are January and March (8.2mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

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Average humidity in September
South Willington, CT

Average humidity in September - South Willington, CT
  • Average humidity in September: 78%

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
South Willington, CT

Average rainfall in September - South Willington, CT
  • Average rainfall in September: 0.39"

The wettest months (with the highest rainfall) are May, June and July (1.1").
The driest month (with the least rainfall) is September (0.39").

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Average rainfall days in September
South Willington, CT

Average rainfall days in September - South Willington, CT
  • Average rainfall days in September: 7.9 days

The month with the highest number of rainy days is June (12.1 days).
Months with the least rainy days are January and February (5.5 days).

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Average snowfall in September
South Willington, CT

Average snowfall in September - South Willington, CT
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.5").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
South Willington, CT

Average snowfall days in September - South Willington, CT
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (6.4 days).
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
South Willington, CT

Average daylight in September / Average sunshine in September - South Willington, CT
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 8.5h

Months with the most sunshine are July and August (Average sunshine: 10.3h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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Average sunshine days in September
South Willington, CT

Average sunshine days in September - South Willington, CT
  • Average sunshine days in September: 19.8 days

The month with the most sunshine days is January (21.9 days).
The month with the least sunshine days is June (15.7 days).

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Average UV index in September
South Willington, CT

Average UV index in September - South Willington, CT
  • Average UV index in September: 4

Months with the highest UV index are June, July and August (UV index 6).
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
South Willington, CT

Average cloud cover in September - South Willington, CT
  • Average cloud cover in September: 39

Months with the most cloud cover are February and March (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 34).

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Average visibility in September
South Willington, CT

Average visibility in September - South Willington, CT
  • Average visibility in September: 5mi

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

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