September weather forecast and climate
Storrs, CT

Weather in September

The first month of the autumn, September, is still a pleasant month in Storrs, Connecticut, with average temperature varying between 55.4°F (13°C) and 72.9°F (22.7°C).

Temperature

In September, the average high-temperature marginally drops, from a moderately hot 80.2°F (26.8°C) in August, to a pleasant 72.9°F (22.7°C). The average low-temperature, in Storrs, is 55.4°F (13°C).

Humidity

In September, the average relative humidity is 78%.

Rainfall

The month with the least rainfall is September when the rain falls for 9.6 days and typically collects 0.39" (10mm) of precipitation.

Snowfall

In Storrs snow does not fall in June through October.

Daylight

The average length of the day in September is 12.5h.

Sunshine

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

UV index

In September, the average daily maximum UV index in Storrs is 4. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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 average humidity in September in Storrs?

The average relative humidity in September is 78%.

What is the driest month in Storrs?

The month with the least rainfall in Storrs is September when the rain falls for 9.6 days and typically collects 0.39" (10mm) of precipitation.

How much does it rain in Storrs in September?

In Storrs, in September, during 9.6 rainfall days, 0.39" (10mm) of precipitation is typically accumulated.

When it does not snow in Storrs?

In Storrs snow does not fall in June through October.

What is the average length of the day in September in Storrs?

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

How long on average sun shines in September in Storrs?

The average sunshine in September is 8.6h.

How high is the UV index in September in Storrs?

In Storrs, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health risk from the exposure to the Sun's UV radiation.

Average temperature in September
Storrs, CT

Average temperature in September - Storrs, CT
  • Average high temperature in September: 72.9°F

The warmest month (with the highest average high temperature) is July (81.7°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 (21.2°F).

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Average pressure in September
Storrs, CT

Average pressure in September - Storrs, CT
  • Average pressure in September: 30.05"

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
Storrs, CT

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

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

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Average humidity in September
Storrs, CT

Average humidity in September - Storrs, 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 (72%).

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Average rainfall in September
Storrs, CT

Average rainfall in September - Storrs, CT
  • Average rainfall in September: 0.39"

The wettest month (with the highest rainfall) is July (1.14").
The driest month (with the least rainfall) is September (0.39").

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Average rainfall days in September
Storrs, CT

Average rainfall days in September - Storrs, CT
  • Average rainfall days in September: 9.6 days

The month with the highest number of rainy days is July (13.4 days).
The month with the least rainy days is January (5.6 days).

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Average snowfall in September
Storrs, CT

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

The month with the highest snowfall is March (0.94").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Storrs, CT

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

The month with the highest number of snowfall days is February (5.4 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
Storrs, CT

Average daylight in September / Average sunshine in September - Storrs, 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: 8.6h

The month with the most sunshine is August (Average sunshine: 10.4h).
The month with the least sunshine is December (Average sunshine: 4.7h).

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Average sunshine days in September
Storrs, CT

Average sunshine days in September - Storrs, CT
  • Average sunshine days in September: 18.7 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (14.9 days).

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Average UV index in September
Storrs, CT

Average UV index in September - Storrs, 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
Storrs, CT

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

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 34).

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Average visibility in September
Storrs, CT

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

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

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