September weather forecast and climate
Bethany, CT

Weather in September

The first month of the autumn, September, is still a pleasant month in Bethany, Connecticut, with average temperature varying between 73.2°F (22.9°C) and 58.1°F (14.5°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 80.1°F (26.7°C) in August, to an agreeable 73.2°F (22.9°C). In Bethany, in September, the average low-temperature is 58.1°F (14.5°C).

Humidity

The average relative humidity in Bethany is 77%.

Rainfall

In Bethany, Connecticut,, it is raining for 10.8 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, in Bethany, there are 134.2 rainfall days, and 15.12" (384mm) of precipitation is accumulated.

Snowfall

In Bethany snow does not fall in June through October.

Daylight

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

Sunshine

The average sunshine in September is 8.8h.

UV index

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected 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 sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 average humidity in September in Bethany?

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

How many days does it rain in September in Bethany?

In Bethany, Connecticut, in September, it is raining for 10.8 days, with typically 1.02" (26mm) of accumulated precipitation.

When it does not snow in Bethany?

In Bethany snow does not fall in June through October.

How many hours of daylight does Bethany have in September?

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

How many hours of sunshine does Bethany have in September?

The average sunshine in September in Bethany is 8.8h.

How high is the UV index in September in Bethany?

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

Average temperature in September
Bethany, CT

Average temperature in September - Bethany, CT
  • Average high temperature in September: 73.2°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 (34.5°F).

  • Average low temperature in September: 58.1°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).

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Average pressure in September
Bethany, CT

Average pressure in September - Bethany, 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
Bethany, CT

Average wind speed in September - Bethany, CT
  • Average wind speed in September: 6.7mph

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

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Average humidity in September
Bethany, CT

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

The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in September
Bethany, CT

Average rainfall in September - Bethany, CT
  • Average rainfall in September: 1.02"

The wettest month (with the highest rainfall) is July (1.69").
The driest month (with the least rainfall) is February (0.79").

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Average rainfall days in September
Bethany, CT

Average rainfall days in September - Bethany, CT
  • Average rainfall days in September: 10.8 days

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is January (7.2 days).

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Average snowfall in September
Bethany, CT

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

The month with the highest snowfall is February (1.14").
Months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Bethany, CT

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

The month with the highest number of snowfall days is February (6.7 days).
Months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Bethany, 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: 9.2h).

  • Average sunshine in September: 8.8h

Months with the most sunshine are July and August (Average sunshine: 10.4h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days in September
Bethany, CT

Average sunshine days in September - Bethany, CT
  • Average sunshine days in September: 17.3 days

The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is June (13.2 days).

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Average UV index in September
Bethany, CT

Average UV index in September - Bethany, 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
Bethany, CT

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

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

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Average visibility in September
Bethany, CT

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

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

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