September weather forecast
Newtown, CT

Weather in September

September, the first month of the autumn in Newtown, is still a pleasant month, with an average temperature varying between 57°F (13.9°C) and 73°F (22.8°C).

Temperature

In September, the average high-temperature marginally drops from a warm 80.2°F (26.8°C) in August to a pleasant 73°F (22.8°C). In September, in Newtown, the average low-temperature is 57°F (13.9°C).

Humidity

In September, the average relative humidity is 77%.

Rainfall

The months with the least rainfall in Newtown, Connecticut, are January and September Rain falls for 13.4 days and accumulates 2.4" (61mm) of rain.

Snowfall

June through September are months without snowfall in Newtown, Connecticut.

Daylight

In September, the average length of the day in Newtown is 12h and 28min.
On the first day of September in Newtown, sunrise is at 6:19 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 6:48 am and sunset at 6:37 pm EDT.

Sunshine

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

UV index

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
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 Newtown?

In Newtown, in September, the average high-temperature is 73°F (22.8°C), and the average low-temperature is 57°F (13.9°C). in July, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, is evaluated at 87.8°F (31°C).

What is the average humidity in September in Newtown?

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

What is the driest month in Newtown?

January and September are months with the least rain in Newtown, Connecticut, when the rain falls for 13.4 days and typically aggregates up to 2.4" (61mm) of rain.

How much does it rain in Newtown in September?

In Newtown, in September, during 13.4 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

When it does not snow in Newtown?

June through September are months without snowfall in Newtown, Connecticut.

Does it snow in Newtown in September?

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

How many hours of daylight does Newtown have in September?

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

When are sunrise and sunset in September in Newtown?

In September, on the first day of the month, sunrise is at 6:19 am and sunset at 7:27 pm. On the last day of the month, in Newtown, sunrise is at 6:48 am and sunset at 6:37 pm EDT.

How many hours of sunshine does Newtown have in September?

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

What is the UV index reading in September in Newtown?

In September, the average daily maximum UV index in Newtown is 4. A UV Index value of 3 to 5 symbolizes a moderate vulnerability 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
Newtown, CT

Average temperature in September - Newtown, CT
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 57°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (22.6°F).

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Average pressure in September
Newtown, CT

Average pressure in September - Newtown, 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
Newtown, CT

Average wind speed in September - Newtown, CT
  • Average wind speed in September: 6.1mph

The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).

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Average humidity in September
Newtown, CT

Average humidity in September - Newtown, 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 (72%).

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Average rainfall in September
Newtown, CT

Average rainfall in September - Newtown, CT
  • Average rainfall in September: 2.4"

The wettest month (with the highest rainfall) is December (4.02").
The driest months (with the least rainfall) are January and September (2.4").

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Average rainfall days in September
Newtown, CT

Average rainfall days in September - Newtown, CT
  • Average rainfall days in September: 13.4 days

The month with the highest number of rainy days is July (18.6 days).
The month with the least rainy days is January (9.1 days).

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Average snowfall in September
Newtown, CT

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

The month with the highest snowfall is February (4.37").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Newtown, CT

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

The month with the highest number of snowfall days is February (9.5 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
Newtown, CT

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

The month with the longest days is June (Average daylight: 15h and 7min).
The month with the shortest days is December (Average daylight: 9h and 14min).

  • Average sunshine in September: 8h and 42min

The months with the most sunshine are July and August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in September
Newtown, CT

Average sunshine days in September - Newtown, CT
  • Average sunshine days in September: 13.9 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (10.1 days).

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Average UV index in September
Newtown, CT

Average UV index in September - Newtown, 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
Newtown, CT

Average cloud cover in September - Newtown, CT
  • Average cloud cover in September: 36

The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Newtown, CT

Average visibility in September - Newtown, CT
  • Average visibility in September: 6mi

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

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