September weather forecast
Hartford, CT

The city of Hartford, Connecticut with the roads leading to the town, and trees on roadsides
The city of Hartford, Connecticut with the roads leading to the town, and trees on roadsides

Weather in September

The first month of the autumn, September, is also a moderately hot month in Hartford, Connecticut, with an average temperature varying between 55.2°F (12.9°C) and 73.4°F (23°C).

Temperature

In Hartford, the average high-temperature in September marginally drops from a moderately hot 81°F (27.2°C) in August to a still warm 73.4°F (23°C). In September, in Hartford, Connecticut, the average low-temperature is 55.2°F (12.9°C).

Humidity

In September, the average relative humidity is 77%.

Rainfall

The month with the least rainfall is September, when the rain falls for 8.2 days and typically collects 0.43" (11mm) of precipitation.

Snowfall

June through October are months without snowfall in Hartford.

Daylight

The average length of the day in September in Hartford, Connecticut, is 12h and 28min.
On the first day of the month, sunrise is at 6:16 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:46 am and sunset at 6:34 pm EDT.

Sunshine

In September, the average sunshine in Hartford is 8.7h.

UV index

The average daily maximum UV index in September in Hartford is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
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 average humidity in September in Hartford?

In September, the average relative humidity is 77%.

What is the driest month in Hartford?

September is the month with the least rainfall. Rain falls for 8.2 days and accumulates 0.43" (11mm) of precipitation.

How many days does it rain in September in Hartford?

In Hartford, in September, during 8.2 rainfall days, 0.43" (11mm) of precipitation is typically accumulated.

When it does not snow in Hartford?

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

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

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

When is the sunrise / sunset in September in Hartford?

In September, on the first day of the month, sunrise is at 6:16 am and sunset at 7:24 pm. On the last day of the month, in Hartford, sunrise is at 6:46 am and sunset at 6:34 pm EDT.

How many hours of sunshine does Hartford have in September?

In September, the average sunshine duration is 8.7h.

How high is the UV index in September in Hartford?

In Hartford, 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 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
Hartford, CT

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

The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is January (33.1°F).

  • Average low temperature in September: 55.2°F

The month with the highest average low temperature is July (63.7°F).
The coldest month (with the lowest average low temperature) is January (21.4°F).

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Average pressure in September
Hartford, CT

Average pressure in September - Hartford, CT
  • Average pressure in September: 30.06"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
Hartford, CT

Average wind speed in September - Hartford, CT
  • Average wind speed in September: 5.8mph

The windiest months (with the highest average wind speed) are January and March (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

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Average humidity in September
Hartford, CT

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

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).

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Average rainfall in September
Hartford, CT

Average rainfall in September - Hartford, CT
  • Average rainfall in September: 0.43"

The wettest months (with the highest rainfall) are June and July (1.06").
The driest month (with the least rainfall) is September (0.43").

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Average rainfall days in September
Hartford, CT

Average rainfall days in September - Hartford, CT
  • Average rainfall days in September: 8.2 days

The month with the highest number of rainy days is July (11.8 days).
The month with the least rainy days is February (6.8 days).

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Average snowfall in September
Hartford, CT

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

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

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Average snowfall days in September
Hartford, CT

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

The month with the highest number of snowfall days is February (5.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 10min).
The month with the shortest days is December (Average daylight: 9h and 13min).

  • Average sunshine in September: 8h and 42min

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 36min).

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Average sunshine days in September
Hartford, CT

Average sunshine days in September - Hartford, CT
  • Average sunshine days in September: 20.3 days

The months with the most sunshine days are January and November (20.4 days).
The month with the least sunshine days is June (16.3 days).

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Average UV index in September
Hartford, CT

Average UV index in September - Hartford, 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
Hartford, CT

Average cloud cover in September - Hartford, CT
  • Average cloud cover in September: 37

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 33).

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Average visibility in September
Hartford, CT

Average visibility in September - Hartford, CT
  • Average visibility in September: 5mi

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

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