September weather forecast and climate
Harwinton, CT

Weather in September

The first month of the autumn, September, is also an agreeable month in Harwinton, Connecticut, with average temperature ranging between min 53.4°F (11.9°C) and max 72°F (22.2°C).

Temperature

In September, the average high-temperature slightly decreases, from a moderately hot 79.3°F (26.3°C) in August, to an agreeable 72°F (22.2°C). The average low-temperature, in September, is 53.4°F (11.9°C).

Humidity

In Harwinton, Connecticut, the average relative humidity in September is 79%.

Rainfall

September is the month with the least rainfall. Rain falls for 12.4 days and accumulates 2.01" (51mm) of precipitation.

Snowfall

In Harwinton snow does not fall in June through September.

Daylight

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

Sunshine

In Harwinton, the average sunshine is 8.5h.

UV index

In Harwinton, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. 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 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.
[Resources]

FAQ

What is the temperature in September in Harwinton?

The average high-temperature, in September, is 72°F (22.2°C), while the average low-temperature is 53.4°F (11.9°C).

What is the average humidity in September in Harwinton?

The average relative humidity in September in Harwinton, Connecticut, is 79%.

How many days does it rain in September in Harwinton?

In September, the rain falls for 12.4 days. Throughout September, 2.01" (51mm) of precipitation is accumulated.

What is the driest month in Harwinton?

September is the month with the least rainfall in Harwinton, Connecticut. Rain falls for 12.4 days and accumulates 2.01" (51mm) of precipitation.

Does it snow in Harwinton in September?

In Harwinton, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Harwinton?

June through September are months without snowfall in Harwinton.

How many hours of daylight does Harwinton have in September?

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

How long on average sun shines in September in Harwinton?

The average sunshine in September in Harwinton, Connecticut, is 8.5h.

What is the UV index intensity in September in Harwinton?

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

Average temperature in September
Harwinton, CT

Average temperature in September - Harwinton, CT
  • Average high temperature in September: 72°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (31.3°F).

  • Average low temperature in September: 53.4°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).

[Resources]

Average pressure in September
Harwinton, CT

Average pressure in September - Harwinton, 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").

[Resources]

Average wind speed in September
Harwinton, CT

Average wind speed in September - Harwinton, CT
  • Average wind speed in September: 5.7mph

The windiest month (with the highest average wind speed) is January (8.4mph).
The calmest month (with the lowest average wind speed) is August (5.1mph).

[Resources]

Average humidity in September
Harwinton, CT

Average humidity in September - Harwinton, CT
  • Average humidity in September: 79%

The month with the highest relative humidity is February (82%).
The month with the lowest relative humidity is April (73%).

[Resources]

Average rainfall in September
Harwinton, CT

Average rainfall in September - Harwinton, CT
  • Average rainfall in September: 2.01"

The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (2.01").

[Resources]

Average rainfall days in September
Harwinton, CT

Average rainfall days in September - Harwinton, CT
  • Average rainfall days in September: 12.4 days

The month with the highest number of rainy days is July (16.8 days).
The month with the least rainy days is January (8.2 days).

[Resources]

Average snowfall in September
Harwinton, CT

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

The month with the highest snowfall is February (5.28").
Months with the least snowfall are June, July, August and September (0").

[Resources]

Average snowfall days in September
Harwinton, CT

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

The month with the highest number of snowfall days is February (10.3 days).
Months with the least snowfall days are June, July, August and September (0 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Harwinton, 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: 8.5h

Months with the most sunshine are July and August (Average sunshine: 10.1h).
The month with the least sunshine is February (Average sunshine: 4.4h).

[Resources]

Average sunshine days in September
Harwinton, CT

Average sunshine days in September - Harwinton, CT
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (16.9 days).
The month with the least sunshine days is June (11.8 days).

[Resources]

Average UV index in September
Harwinton, CT

Average UV index in September - Harwinton, CT
  • Average UV index in September: 4

The month with the highest UV index is June (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

[Resources]

Average cloud cover in September
Harwinton, CT

Average cloud cover in September - Harwinton, CT
  • Average cloud cover in September: 40

The month with the most cloud cover is February (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 36).

[Resources]

Average visibility in September
Harwinton, CT

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

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

[Resources]