September weather forecast
Stamford, CT

A wide aerial scenic cover shot over downtown Stamford, Connecticut, with two rivers and weighty rain clouds in the sky above
A wide aerial scenic cover shot over downtown Stamford, Connecticut, with two rivers and weighty rain clouds in the sky above

Weather in September

The first month of the autumn, September, is still a pleasant month in Stamford, Connecticut, with an average temperature varying between 73.2°F (22.9°C) and 61.9°F (16.6°C).

Temperature

In September, the average high-temperature marginally drops from a moderately hot 80.4°F (26.9°C) in August to an agreeable 73.2°F (22.9°C). In Stamford, Connecticut, the average low-temperature is 61.9°F (16.6°C).

Humidity

In September, the average relative humidity in Stamford is 74%.

Rainfall

In Stamford, during 13.5 rainfall days, 2.76" (70mm) of precipitation is typically accumulated. Throughout the year, in Stamford, there are 164.1 rainfall days, and 37.95" (964mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in Stamford.

Ocean temperature

In Stamford, the average seawater temperature in September is 68.9°F (20.5°C).
Note: Swimming in 68.9°F (20.5°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

Daylight

In Stamford, the average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:21 am and sunset at 7:27 pm. On the last day of September, in Stamford, sunrise is at 6:49 am and sunset at 6:38 pm EDT.

Sunshine

The average sunshine in September in Stamford is 8.8h.

UV index

In Stamford, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. 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 Stamford?

In September, the average high-temperature is 73.2°F (22.9°C), and the average low-temperature is 61.9°F (16.6°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in July is calculated to be 86°F (30°C).

What is the average humidity in September in Stamford?

In September, the average relative humidity in Stamford is 74%.

How many days does it rain in September in Stamford?

In Stamford, Connecticut, in September, it is raining for 13.5 days, with typically 2.76" (70mm) of accumulated precipitation.

When it does not snow in Stamford?

May through October are months without snowfall in Stamford.

How cold is the water in September in Stamford?

In Stamford, Connecticut, the average seawater temperature in September is 68.9°F (20.5°C). Swimming in 68.9°F (20.5°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

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

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

When are sunrise and sunset in September in Stamford?

On the first day of September in Stamford, sunrise is at 6:21 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 6:38 pm EDT.

How long on average sun shines in September in Stamford?

In Stamford, Connecticut, the average sunshine duration in September is 8.8h.

What is the UV index reading in September in Stamford?

In Stamford, 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 UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Stamford, CT

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

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (36°F).

  • Average low temperature in September: 61.9°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (26.6°F).

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Average pressure in September
Stamford, CT

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

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Stamford, CT

Average wind speed in September - Stamford, 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 (6.6mph).

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Average humidity in September
Stamford, CT

Average humidity in September - Stamford, CT
  • Average humidity in September: 74%

The months with the highest relative humidity are February, May, June and December (75%).
The months with the lowest relative humidity are April, August and November (72%).

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Average rainfall in September
Stamford, CT

Average rainfall in September - Stamford, CT
  • Average rainfall in September: 2.76"

The wettest month (with the highest rainfall) is July (4.25").
The driest months (with the least rainfall) are January and February (2.36").

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Average rainfall days in September
Stamford, CT

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

The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (8.3 days).

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Average snowfall in September
Stamford, CT

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

The months with the highest snowfall are February and March (2.44").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Stamford, CT

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

The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in September
Stamford, CT

Average sea temperature in September - Stamford, CT
  • Average sea temperature in September: 68.9°F

The best month for swimming (with the highest average sea temperature) is August (73.1°F).
The coldest month (with the lowest average sea temperature) is February (39.5°F).

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

Average daylight in September / Average sunshine in September - Stamford, CT
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 5min).
The month with the shortest days is December (Average daylight: 9h and 17min).

  • Average sunshine in September: 8h and 48min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in September
Stamford, CT

Average sunshine days in September - Stamford, CT
  • Average sunshine days in September: 14.5 days

The month with the most sunshine days is January (17.8 days).
The month with the least sunshine days is June (10.7 days).

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Average UV index in September
Stamford, CT

Average UV index in September - Stamford, 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
Stamford, CT

Average cloud cover in September - Stamford, CT
  • Average cloud cover in September: 35

The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in September
Stamford, CT

Average visibility in September - Stamford, 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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