September weather forecast and climate
Blue Hills, CT

Weather in September

September, the first month of the autumn, in Blue Hills, is also a moderately hot month, with average temperature fluctuating between 73.4°F (23°C) and 55.2°F (12.9°C).

Temperature

In Blue Hills, Connecticut, the average high-temperature marginally drops, from 81°F (27.2°C) in August, to a still moderately hot 73.4°F (23°C). The average low-temperature, in Blue Hills, is 55.2°F (12.9°C).

Humidity

In September, the average relative humidity 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

June through October are months without snowfall in Blue Hills.

Daylight

In Blue Hills, the average length of the day is 12.5h.

Sunshine

The average sunshine in September is 8.7h.

UV index

In September, the average daily maximum UV index in Blue Hills is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 interpret into the following advice:
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. 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.
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FAQ

What is the temperature in September in Blue Hills?

In Blue Hills, 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 Blue Hills?

In September, the average relative humidity is 77%.

How many days does it rain in September in Blue Hills?

In Blue Hills, Connecticut, in September, it is raining for 8.2 days, with typically 0.43" (11mm) of accumulated precipitation.

What is the driest month in Blue Hills?

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

When it does not snow in Blue Hills?

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

How many hours of daylight does Blue Hills have in September?

The average length of the day in September in Blue Hills, Connecticut, is 12.5h.

How long on average sun shines in September in Blue Hills?

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

What is the UV index reading in September in Blue Hills?

The average daily maximum UV index in September in Blue Hills is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Blue Hills, CT

Average temperature in September - Blue Hills, 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
Blue Hills, CT

Average pressure in September - Blue Hills, 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
Blue Hills, CT

Average wind speed in September - Blue Hills, 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
Blue Hills, CT

Average humidity in September - Blue Hills, 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
Blue Hills, CT

Average rainfall in September - Blue Hills, 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
Blue Hills, CT

Average rainfall days in September - Blue Hills, 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
Blue Hills, CT

Average snowfall in September - Blue Hills, 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
Blue Hills, CT

Average snowfall days in September - Blue Hills, 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
Blue Hills, CT

Average daylight in September / Average sunshine in September - Blue Hills, 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
Blue Hills, CT

Average sunshine days in September - Blue Hills, 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
Blue Hills, CT

Average UV index in September - Blue Hills, 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
Blue Hills, CT

Average cloud cover in September - Blue Hills, 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
Blue Hills, CT

Average visibility in September - Blue Hills, 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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