Hartford
Connecticut, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Hartford, CT

Skyscape view of the city of Hartford, Connecticut, with the roads leading to the town, and trees on roadsides
Skyscape view of the city of Hartford, Connecticut, with the roads leading to the town, and trees on roadsides
September, the first month of the autumn, in Hartford, is still a warm month, with average temperature varying between 74.8°F (23.8°C) and 52.7°F (11.5°C).

Temperature

In Hartford, the average high-temperature marginally drops, from a moderately hot 82.8°F (28.2°C) in August, to a still warm 74.8°F (23.8°C). In Hartford, Connecticut, in September, the average low-temperature is 52.7°F (11.5°C).

Humidity

The most humid month in Hartford is September, with an average relative humidity of 72.9%.

Rainfall

In Hartford, during 9.8 rainfall days, 3.9" (98.6mm) of precipitation is typically accumulated. In Hartford, during the entire year, the rain falls for 130 days and collects up to 45.9" (1164.6mm) of precipitation.

Snowfall

May through October are months without snowfall in Hartford.

Daylight

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

Sunshine

In September, the average sunshine is 7.5h.

UV index

The average daily maximum UV index in Hartford is 6. A UV Index value of 6 to 7 symbolizes a high health hazard from unsafe exposure to the UV radiation for the ordinary person.
Note: The daily maximum UV index of 6 interpret into the following advice:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for 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.

What is the temperature in September in Hartford?

In Hartford, Connecticut, in September, the average high-temperature is 74.8°F (23.8°C), and the average low-temperature is 52.7°F (11.5°C).

What is the most humid month in Hartford?

With an average relative humidity of 72.9%, September is the most humid month in Hartford.

What is the average humidity in September in Hartford?

In September, the average relative humidity is 72.9%.

How much does it rain in Hartford in September?

In Hartford, Connecticut, during September, the rain falls for 9.8 days and regularly aggregates up to 3.9" (98.6mm) of precipitation.

When it does not snow in Hartford?

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

How many hours of daylight does Hartford have in September?

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

How many hours of sunshine does Hartford have in September?

In Hartford, the average sunshine in September is 7.5h.

What is the UV index reading in September in Hartford?

In September, the average daily maximum UV index in Hartford is 6. A UV Index reading of 6 to 7 represents a high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Hartford, CT
  • Average high temperature in September: 74.9°F

The warmest month (with the highest average high temperature) is July (84.5°F).
The month with the lowest average high temperature is January (34.5°F).

  • Average low temperature in September: 52.7°F

The month with the highest average low temperature is July (62.7°F).
The coldest month (with the lowest average low temperature) is January (17.7°F).

Average humidity in September - Hartford, CT
  • Average humidity in September: 72.9%

The month with the highest relative humidity is September (72.9%).
The month with the lowest relative humidity is April (58%).

Average rainfall in September - Hartford, CT
  • Average rainfall in September: 3.9"

Wettest months (with the highest rainfall) are May, June and October (4.4").
The driest month (with the lowest rainfall) is February (2.9").

Average rainfall days in September - Hartford, CT
  • Average rainfall days in September: 9.8 days

The month with the highest number of rainy days is May (12.8 days).
The month with the lowest number of rainy days is February (9.7 days).

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

The month with the highest snowfall is January (12.3").
Months with the lowest snowfall are May, June, July, August, September and October (0").

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

The month with the highest number of snowfall days is January (5.8 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (0 days).

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 shortest days is December (Average daylight: 9.2h).

  • Average sunshine in September: 7.5h

The month with most sunshine is July (Average sunshine: 9.5h).
The month with least sunshine is December (Average sunshine: 4.5h).

Average UV index in September - Hartford, CT
  • Average UV index in September: 6

Months with the highest UV index are June, July and August (UV index 8).
Months with the lowest UV index are January and December (UV index 1).