September weather forecast and climate
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

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

Temperature

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

Humidity

In Hartford, Connecticut, the average relative humidity in September 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

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

Daylight

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

Sunshine

In Hartford, the average sunshine is 8.7h.

UV index

In September, the average daily maximum UV index in Hartford is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from the exposure to the Sun's UV rays for average individuals.
Note: The average daily UV index of 4 in September transform into the following instructions:
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 temperature in September in Hartford?

In Hartford, in September, the average high-temperature is 73.4°F (23°C), and the average low-temperature is 55.2°F (12.9°C).

What is the average humidity in September in Hartford?

The average relative humidity in September in Hartford is 77%.

How many days does it rain in September in Hartford?

In September, the rain falls for 8.2 days. Throughout September, 0.43" (11mm) of precipitation is accumulated.

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.

When it does not snow in Hartford?

June through October are months without snowfall in Hartford.

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

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

How long on average sun shines in September in Hartford?

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

How high is the UV index in September in Hartford?

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

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"

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
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").
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).
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: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 8.7h

Months with the most sunshine are July and August (Average sunshine: 10.4h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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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

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

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
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

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

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