September weather forecast
Allston, MA

Weather in September

The first month of the autumn, September, is also an agreeable month in Allston, Massachusetts, with an average temperature varying between 72.9°F (22.7°C) and 56.7°F (13.7°C).

Temperature

In Allston, the average high-temperature in September marginally drops from a warm 80.4°F (26.9°C) in August to an agreeable 72.9°F (22.7°C). The average low-temperature, in September, is 56.7°F (13.7°C).

Humidity

The average relative humidity in September is 75%.

Rainfall

September is the month with the least rainfall in Allston, Massachusetts. Rain falls for 6.4 days and accumulates 0.2" (5mm) of precipitation.

Snowfall

June through October are months without snowfall.

Daylight

The average length of the day in September in Allston is 12h and 28min.
On the first day of September in Allston, sunrise is at 6:09 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:28 pm EDT.

Sunshine

The average sunshine in September in Allston, Massachusetts, is 8.5h.

UV index

In Allston, Massachusetts, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
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 the 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 Allston?

The average high-temperature, in September, in Allston, Massachusetts, is 72.9°F (22.7°C), while the average low-temperature is 56.7°F (13.7°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in July is appraised at 86°F (30°C).

What is the average humidity in September in Allston?

In September, the average relative humidity is 75%.

What is the driest month in Allston?

September is the month with the least rainfall in Allston, Massachusetts. Rain falls for 6.4 days and accumulates 0.2" (5mm) of precipitation.

How much does it rain in Allston in September?

In Allston, Massachusetts, in September, during 6.4 rainfall days, 0.2" (5mm) of precipitation is typically accumulated.

When it does not snow in Allston?

June through October are months without snowfall.

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

The average day length in September in Allston is 12h and 28min.

When are sunrise and sunset in September in Allston?

In September, on the first day of the month, sunrise is at 6:09 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:28 pm EDT.

How long on average sun shines in September in Allston?

In Allston, the average sunshine duration in September is 8.5h.

What is the UV index intensity in September in Allston?

In September, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Allston, MA

Average temperature in September - Allston, MA
  • Average high temperature in September: 72.9°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (33.8°F).

  • Average low temperature in September: 56.7°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

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Average pressure in September
Allston, MA

Average pressure in September - Allston, MA
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
Allston, MA

Average wind speed in September - Allston, MA
  • Average wind speed in September: 6.6mph

The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity in September
Allston, MA

Average humidity in September - Allston, MA
  • Average humidity in September: 75%

The months with the highest relative humidity are January and February (77%).
The month with the lowest relative humidity is April (69%).

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Average rainfall in September
Allston, MA

Average rainfall in September - Allston, MA
  • Average rainfall in September: 0.2"

The wettest month (with the highest rainfall) is November (0.63").
The driest month (with the least rainfall) is September (0.2").

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Average rainfall days in September
Allston, MA

Average rainfall days in September - Allston, MA
  • Average rainfall days in September: 6.4 days

The month with the highest number of rainy days is July (9.6 days).
The month with the least rainy days is January (4.3 days).

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Average snowfall in September
Allston, MA

Average snowfall in September - Allston, MA
  • Average snowfall in September: 0"

The month with the highest snowfall is December (0.71").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in September
Allston, MA

Average snowfall days in September - Allston, MA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
Allston, MA

Average daylight in September / Average sunshine in September - Allston, MA
  • Average daylight in September: 12h and 28min

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

  • Average sunshine in September: 8h and 30min

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in September
Allston, MA

Average sunshine days in September - Allston, MA
  • Average sunshine days in September: 21.8 days

The month with the most sunshine days is January (23.5 days).
The month with the least sunshine days is June (17.4 days).

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Average UV index in September
Allston, MA

Average UV index in September - Allston, MA
  • 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
Allston, MA

Average cloud cover in September - Allston, MA
  • Average cloud cover in September: 36

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 32).

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Average visibility in September
Allston, MA

Average visibility in September - Allston, MA
  • Average visibility in September: 6mi

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

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