September weather forecast and climate
Westport, CT

The colorful houses on the shores of Westport, Connecticut
The colorful houses on the shores of Westport, Connecticut

Weather in September

September, the first month of the autumn, in Westport, is still a pleasant month, with average temperature varying between 73°F (22.8°C) and 61.2°F (16.2°C).

Temperature

In September, the average high-temperature marginally drops, from a warm 80.1°F (26.7°C) in August, to an agreeable 73°F (22.8°C). In Westport, in September, the average low-temperature is 61.2°F (16.2°C).

Humidity

The average relative humidity in Westport is 75%.

Rainfall

In Westport, during September, the rain falls for 13.4 days and regularly aggregates up to 2.72" (69mm) of precipitation. Throughout the year, in Westport, there are 166.3 rainfall days, and 37.87" (962mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall.

Daylight

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

Sunshine

In Westport, the average sunshine is 8.9h.

UV index

In Westport, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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. 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 temperature in September in Westport?

In Westport, in September, the average high-temperature is 73°F (22.8°C), and the average low-temperature is 61.2°F (16.2°C).

What is the average humidity in September in Westport?

The average relative humidity in September in Westport is 75%.

How much does it rain in Westport in September?

In Westport, in September, it is raining for 13.4 days, with typically 2.72" (69mm) of accumulated precipitation.

When it does not snow in Westport?

May through October are months without snowfall.

How many hours of daylight does Westport have in September?

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

How many hours of sunshine does Westport have in September?

In Westport, Connecticut, the average sunshine in September is 8.9h.

How high is the UV index in September in Westport?

In September, the average daily maximum UV index in Westport, Connecticut, is 4. A UV Index of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.

Average temperature in September
Westport, CT

Average temperature in September - Westport, CT
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in September: 61.2°F

The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).

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Average pressure in September
Westport, CT

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

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

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Average wind speed in September
Westport, CT

Average wind speed in September - Westport, CT
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.5mph).

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Average humidity in September
Westport, CT

Average humidity in September - Westport, CT
  • Average humidity in September: 75%

Months with the highest relative humidity are February, May and June (76%).
Months with the lowest relative humidity are April and November (72%).

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Average rainfall in September
Westport, CT

Average rainfall in September - Westport, CT
  • Average rainfall in September: 2.72"

The wettest month (with the highest rainfall) is July (4.13").
The driest months (with the least rainfall) are January and February (2.36").

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Average rainfall days in September
Westport, CT

Average rainfall days in September - Westport, CT
  • Average rainfall days in September: 13.4 days

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is January (8.3 days).

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Average snowfall in September
Westport, CT

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

The month with the highest snowfall is February (2.83").
Months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Westport, CT

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

The month with the highest number of snowfall days is February (7.4 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
Westport, CT

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

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 8.9h

The month with the most sunshine is July (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days in September
Westport, CT

Average sunshine days in September - Westport, CT
  • Average sunshine days in September: 14 days

The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is June (10 days).

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Average UV index in September
Westport, CT

Average UV index in September - Westport, 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
Westport, CT

Average cloud cover in September - Westport, CT
  • Average cloud cover in September: 34

Months with the most cloud cover are February, March and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 30).

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Average visibility in September
Westport, CT

Average visibility in September - Westport, CT
  • Average visibility in September: 6mi

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

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