September weather forecast
Old Saybrook, CT

Weather in September

September, the first month of the autumn in Old Saybrook, is still a pleasant month, with an average temperature varying between 72.3°F (22.4°C) and 59.5°F (15.3°C).

Temperature

In Old Saybrook, the average high-temperature in September slightly decreases from a warm 78.6°F (25.9°C) in August to a pleasant 72.3°F (22.4°C). In September, the average low-temperature is 59.5°F (15.3°C).

Humidity

In September, the average relative humidity is 77%.

Rainfall

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

Snowfall

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

Ocean temperature

In Old Saybrook, the average seawater temperature in September is 68.2°F (20.1°C).
Note: Swimming in 68.2°F (20.1°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

The average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:16 am and sunset at 7:22 pm. On the last day of September, sunrise is at 6:45 am and sunset at 6:33 pm EDT.

Sunshine

In September, the average sunshine is 8.9h.

UV index

In September, the average daily maximum UV index in Old Saybrook is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. 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 the 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 Old Saybrook?

In Old Saybrook, in September, the average high-temperature is 72.3°F (22.4°C), and the average low-temperature is 59.5°F (15.3°C).

What is the average humidity in September in Old Saybrook?

In September, the average relative humidity in Old Saybrook, Connecticut, is 77%.

What is the driest month in Old Saybrook?

The month with the least rainfall 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 Old Saybrook?

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

When it does not snow in Old Saybrook?

June through October are months without snowfall in Old Saybrook, Connecticut.

What is the ocean temperature in September in Old Saybrook?

In Old Saybrook, 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).

What is the average length of the day in September in Old Saybrook?

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

When is the sunrise / sunset in September in Old Saybrook?

On the first day of September in Old Saybrook, Connecticut, sunrise is at 6:16 am and sunset at 7:22 pm. On the last day of the month, sunrise is at 6:45 am and sunset at 6:33 pm EDT.

How long on average sun shines in September in Old Saybrook?

The average sunshine duration in September in Old Saybrook, Connecticut, is 8.9h.

What is the UV index reading in September in Old Saybrook?

In Old Saybrook, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Old Saybrook, CT

Average temperature in September - Old Saybrook, 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
Old Saybrook, CT

Average pressure in September - Old Saybrook, 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
Old Saybrook, CT

Average wind speed in September - Old Saybrook, 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
Old Saybrook, CT

Average humidity in September - Old Saybrook, 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
Old Saybrook, CT

Average rainfall in September - Old Saybrook, 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
Old Saybrook, CT

Average rainfall days in September - Old Saybrook, 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
Old Saybrook, CT

Average snowfall in September - Old Saybrook, 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
Old Saybrook, CT

Average snowfall days in September - Old Saybrook, 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
Old Saybrook, CT

Average sea temperature in September - Old Saybrook, 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
Old Saybrook, CT

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

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 15min).

  • Average sunshine in September: 8h and 54min

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
Old Saybrook, CT

Average sunshine days in September - Old Saybrook, 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
Old Saybrook, CT

Average UV index in September - Old Saybrook, 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
Old Saybrook, CT

Average cloud cover in September - Old Saybrook, 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
Old Saybrook, CT

Average visibility in September - Old Saybrook, 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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