September weather forecast
Seymour, CT

Weather in September

September, the first month of the autumn in Seymour, is still a warm month, with an average temperature varying between 57.7°F (14.3°C) and 73.4°F (23°C).

Temperature

In Seymour, the average high-temperature in September marginally drops from 80.4°F (26.9°C) in August to a still warm 73.4°F (23°C). In September, in Seymour, the average low-temperature is 57.7°F (14.3°C).

Humidity

The average relative humidity in September is 77%.

Rainfall

In Seymour, during 10.5 rainfall days, 0.55" (14mm) of precipitation is typically accumulated. In Seymour, Connecticut, during the entire year, the rain falls for 118.8 days and collects up to 9.61" (244mm) of precipitation.

Snowfall

In Seymour, snow does not fall in April through October.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of September, sunrise is at 6:18 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:36 pm EDT.

Sunshine

The average sunshine in September in Seymour is 8.8h.

UV index

In Seymour, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sunburn is recommended. 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 Seymour?

In September, the average high-temperature is 73.4°F (23°C), and the average low-temperature is 57.7°F (14.3°C). The average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, in July is estimated at 87.8°F (31°C).

What is the average humidity in September in Seymour?

The average relative humidity in September in Seymour, Connecticut, is 77%.

How many days does it rain in September in Seymour?

In Seymour, during September, the rain falls for 10.5 days and regularly aggregates up to 0.55" (14mm) of precipitation.

When it does not snow in Seymour?

In Seymour, snow does not fall in April through October.

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

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

When are sunrise and sunset in September in Seymour?

On the first day of September in Seymour, sunrise is at 6:18 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:47 am and sunset at 6:36 pm EDT.

How long on average sun shines in September in Seymour?

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

What is the UV index reading in September in Seymour?

In September, the average daily maximum UV index in Seymour, Connecticut, is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to the Sun's 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
Seymour, CT

Average temperature in September - Seymour, CT
  • Average high temperature in September: 73.4°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in September: 57.7°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).

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Average pressure in September
Seymour, CT

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

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

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Average wind speed in September
Seymour, CT

Average wind speed in September - Seymour, CT
  • Average wind speed in September: 6.4mph

The windiest month (with the highest average wind speed) is January (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.6mph).

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Average humidity in September
Seymour, CT

Average humidity in September - Seymour, 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
Seymour, CT

Average rainfall in September - Seymour, CT
  • Average rainfall in September: 0.55"

The wettest month (with the highest rainfall) is July (1.22").
The driest months (with the least rainfall) are January and February (0.47").

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Average rainfall days in September
Seymour, CT

Average rainfall days in September - Seymour, CT
  • Average rainfall days in September: 10.5 days

The month with the highest number of rainy days is July (14.3 days).
The month with the least rainy days is January (5.3 days).

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Average snowfall in September
Seymour, CT

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

The month with the highest snowfall is December (0.55").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Seymour, CT

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

The month with the highest number of snowfall days is February (5.8 days).
The 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
Seymour, CT

Average daylight in September / Average sunshine in September - Seymour, 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 14min).

  • Average sunshine in September: 8h and 48min

The months with the most sunshine are July and August (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in September
Seymour, CT

Average sunshine days in September - Seymour, CT
  • Average sunshine days in September: 17.9 days

The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is July (13.9 days).

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Average UV index in September
Seymour, CT

Average UV index in September - Seymour, 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
Seymour, CT

Average cloud cover in September - Seymour, 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
Seymour, CT

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

The 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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