September weather forecast
Westbrook, CT

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Weather in September

September marks the transition from the scorching summer heat to the mild and inviting onset of fall in Westbrook. The month promises cooler temperatures, settling at a comfortable high of 72.3°F (22.4°C). It's a more manageable warmth that invites you to experience and explore the city. Slowly falling leaves begin to replace summer blossoms painting a beautiful picture of changing seasons. Finally, the decrease in rainfall, at 1.93" (49mm), brings a crisp contrast to the previous wetter months.

Temperature

Westbrook in September experiences a gentle temperature dip, with average high-temperatures reducing from a moderately hot 78.6°F (25.9°C) in August to an agreeable 72.3°F (22.4°C). During the nights in September, Westbrook experiences a consistent average temperature of 59.5°F (15.3°C).

Humidity

The average relative humidity in September in Westbrook is 77%.

Rainfall

September is the month with the least rainfall in Westbrook, Connecticut. Rain falls for 13 days and accumulates 1.93" (49mm) of precipitation.

Snowfall

In Westbrook, Connecticut, snow does not fall in June through October.

Ocean temperature

In Westbrook, in September, the average water temperature is 68.2°F (20.1°C).
Note: Most people find swimming in 68.2°F (20.1°C) unenjoyable. As the water temperature falls from 69.8°F (21°C) to 59°F (15°C), controlling one's breathing becomes harder.

Daylight

In Westbrook, the average length of the day in September is 12h and 28min.
On the first day of September, sunrise is at 6:16 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:32 pm EDT.

Sunshine

In September, the average sunshine is 8.9h.

UV index

In Westbrook, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.
Note: The UV index of 4 during September leads to these advisories:
Put precautions into practice - Protective measures against sun-induced damage are advised. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
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Frequently asked questions

What is the usual temperature for Westbrook in September?

The average high-temperature, in September, in Westbrook, is 72.3°F (22.4°C), while the average low-temperature is 59.5°F (15.3°C).

What is the average humidity in September in Westbrook?

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

What is the driest month in Westbrook?

The month with the least rainfall in Westbrook is September, when the rain falls for 13 days and typically collects 1.93" (49mm) of precipitation.

How many days does it rain in September in Westbrook?

In Westbrook, Connecticut, during September, the rain falls for 13 days and regularly aggregates up to 1.93" (49mm) of precipitation.

When it does not snow in Westbrook?

June through October are months without snowfall in Westbrook, Connecticut.

How cold is the water in September in Westbrook?

In Westbrook, Connecticut, in September, the average water temperature is 68.2°F (20.1°C). For swimming, a surface water temperature of 68.2°F (20.1°C) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Westbrook have in September?

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

When is the sunrise / sunset in September in Westbrook?

On the first day of September, sunrise is at 6:16 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:46 am and sunset at 6:32 pm EDT.

How many hours of sunshine does Westbrook have in September?

The average sunshine duration in September is 8.9h.

What is the UV index reading in September in Westbrook?

In Westbrook, Connecticut, 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 daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Westbrook, CT

Average temperature in September - Westbrook, CT
  • Average high temperature in September: 72.3°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in September: 59.5°F

The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (25.5°F).

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Average pressure in September
Westbrook, CT

Average pressure in September - Westbrook, 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
Westbrook, CT

Average wind speed in September - Westbrook, CT
  • Average wind speed in September: 8.1mph

The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest months (with the lowest average wind speed) are July and August (7.1mph).

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Average humidity in September
Westbrook, CT

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

The months with the highest relative humidity are May, June and July (78%).
The month with the lowest relative humidity is April (73%).

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Average rainfall in September
Westbrook, CT

Average rainfall in September - Westbrook, CT
  • Average rainfall in September: 1.93"

The wettest month (with the highest rainfall) is December (3.66").
The driest month (with the least rainfall) is September (1.93").

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Average rainfall days in September
Westbrook, CT

Average rainfall days in September - Westbrook, CT
  • Average rainfall days in September: 13 days

The month with the highest number of rainy days is July (17 days).
The month with the least rainy days is January (9 days).

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Average snowfall in September
Westbrook, CT

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

The month with the highest snowfall is March (2.76").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Westbrook, CT

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

The month with the highest number of snowfall days is February (7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in September
Westbrook, CT

Average sea temperature in September - Westbrook, CT
  • Average sea temperature in September: 68.2°F

The best month for swimming (with the highest average sea temperature) is August (72.1°F).
The coldest month (with the lowest average sea temperature) is February (38.8°F).

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

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

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in September: 8h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

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Average sunshine days in September
Westbrook, CT

Average sunshine days in September - Westbrook, CT
  • Average sunshine days in September: 14.2 days

The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is July (11.7 days).

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Average UV index in September
Westbrook, CT

Average UV index in September - Westbrook, 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
Westbrook, CT

Average cloud cover in September - Westbrook, CT
  • Average cloud cover in September: 33

The months with the most cloud cover are February and December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in September
Westbrook, CT

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

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

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Westbrook, Connecticut, USA

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