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 fluctuating between 55.2°F (12.9°C) and 73.4°F (23°C).

Temperature

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

Humidity

The average relative humidity in September is 77%.

Rainfall

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

Snowfall

June through October are months without snowfall.

Daylight

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

Sunshine

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

UV index

In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Hartford?

The average high-temperature, in September, in Hartford, Connecticut, is 73.4°F (23°C), while the average low-temperature is 55.2°F (12.9°C). in August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is appraised at 86°F (30°C).

What is the average humidity in September in Hartford?

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

What is the driest month in Hartford?

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

How much does it rain in Hartford in September?

In Hartford, Connecticut, during September, the rain falls for 8.2 days and regularly aggregates up to 0.43" (11mm) of precipitation.

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 in Hartford is 12h and 28min.

When are sunrise and sunset in September in Hartford?

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

How long on average sun shines in September in Hartford?

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

How high is the UV index in September in Hartford?

The average daily maximum UV index in September in Hartford, Connecticut, is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to Sun's UV rays.
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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