September weather forecast
East Boston, MA

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Weather in September

September, the first month of the autumn in East Boston, is still a pleasant month, with an average temperature varying between 57.4°F (14.1°C) and 72.7°F (22.6°C).

Temperature

With the beginning of September, the average high-temperature shows a small decrease, transitioning from a moderately hot 80.4°F (26.9°C) in August to an agreeable 72.7°F (22.6°C). September nights are marked by an average low-temperature of 57.4°F (14.1°C).

Humidity

In East Boston, the average relative humidity in September is 75%.

Rainfall

September is the month with the least rainfall. Rain falls for 10 days and accumulates 1.26" (32mm) of precipitation.

Snowfall

In East Boston, snow does not fall in June through September.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:10 am and sunset at 7:17 pm. On the last day of September, sunrise is at 6:40 am and sunset at 6:26 pm EDT.

Sunshine

In East Boston, the average sunshine in September is 8.4h.

UV index

In East Boston, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.
Note: In September, the maximum UV index of 4 suggests this advice:
Heed the precautions - It is counselled to guard against solar damage. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.

Frequently asked questions

What is the average September temperature in East Boston?

During September, East Boston experiences an average high-temperature of 72.7°F (22.6°C) and a low-temperature of 57.4°F (14.1°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, in July is calculated to be 86°F (30°C).

What is the average humidity in September?

The average relative humidity in September is 75%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 10 days and typically collects 1.26" (32mm) of precipitation.

How much does it rain in September?

In September, the rain falls for 10 days. Throughout September, 1.26" (32mm) of precipitation is accumulated.

When it does not snow?

June through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

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

What time are sunrise and sunset in September?

On the first day of September, sunrise is at 6:10 am and sunset at 7:17 pm. On the last day of the month, sunrise is at 6:40 am and sunset at 6:26 pm EDT.

How long on average sun shines in September?

In September, the average sunshine duration is 8.4h.

What is the UV index intensity in September?

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

Average temperature in September
East Boston, MA

Average temperature in September - East Boston, MA
  • Average high temperature in September: 72.7°F

The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (34.2°F).

  • Average low temperature in September: 57.4°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).

Average pressure in September
East Boston, MA

Average pressure in September - East Boston, 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).

Average wind speed in September
East Boston, MA

Average wind speed in September - East Boston, MA
  • Average wind speed in September: 6.8mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

Average humidity in September
East Boston, MA

Average humidity in September - East Boston, MA
  • Average humidity in September: 75%

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

Average rainfall in September
East Boston, MA

Average rainfall in September - East Boston, MA
  • Average rainfall in September: 1.26"

The wettest months (with the highest rainfall) are March, April and December (2.91").
The driest month (with the least rainfall) is September (1.26").

Average rainfall days in September
East Boston, MA

Average rainfall days in September - East Boston, MA
  • Average rainfall days in September: 10 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.9 days).

Average snowfall in September
East Boston, MA

Average snowfall in September - East Boston, MA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (4.72").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in September
East Boston, MA

Average snowfall days in September - East Boston, MA
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January and February (7.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September /
Average sunshine in September
East Boston, MA

Average daylight in September / Average sunshine in September - East Boston, MA
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in September: 8h and 2min

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 36min).

Average sunshine days in September
East Boston, MA

Average sunshine days in September - East Boston, MA
  • Average sunshine days in September: 17.7 days

The month with the most sunshine days is September (17.7 days).
The month with the least sunshine days is April (13 days).

Average UV index in September
East Boston, MA

Average UV index in September - East Boston, 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).

Average cloud cover in September
East Boston, MA

Average cloud cover in September - East Boston, MA
  • Average cloud cover in September: 37

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 32).

Average visibility in September
East Boston, MA

Average visibility in September - East Boston, 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).

East Boston, Massachusetts, USA

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