September weather forecast
Belmont, MA

Weather in September

The first month of the autumn, September, is also an agreeable month in Belmont, Massachusetts, with an average temperature fluctuating between 73°F (22.8°C) and 56.5°F (13.6°C).

Temperature

In Belmont, Massachusetts, the average high-temperature in September slightly decreases from a moderately hot 80.8°F (27.1°C) in August to an agreeable 73°F (22.8°C). The average low-temperature, in Belmont, Massachusetts, is 56.5°F (13.6°C).

Humidity

The average relative humidity in September in Belmont is 75%.

Rainfall

September is the month with the least rainfall. Rain falls for 10.7 days and accumulates 1.3" (33mm) of precipitation.

Snowfall

In Belmont, snow does not fall in June through September.

Daylight

In September, the average length of the day in Belmont is 12h and 28min.
On the first day of September in Belmont, Massachusetts, sunrise is at 6:10 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 Belmont is 8.5h.

UV index

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
[Resources]

FAQ

What is the average humidity in September in Belmont?

In September, the average relative humidity is 75%.

What is the driest month in Belmont?

September is the month with the least rainfall in Belmont. Rain falls for 10.7 days and accumulates 1.3" (33mm) of precipitation.

How much does it rain in Belmont in September?

In Belmont, in September, it is raining for 10.7 days, with typically 1.3" (33mm) of accumulated precipitation.

When it does not snow in Belmont?

June through September are months without snowfall.

Does it snow in Belmont in September?

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

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

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

When is the sunrise / sunset in September in Belmont?

On the first day of September in Belmont, Massachusetts, sunrise is at 6:10 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 many hours of sunshine does Belmont have in September?

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

How high is the UV index in September in Belmont?

In September, the average daily maximum UV index in Belmont, Massachusetts, is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe 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
Belmont, MA

Average temperature in September - Belmont, MA
  • Average high temperature in September: 73°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in September: 56.5°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).

[Resources]

Average pressure in September
Belmont, MA

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

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

[Resources]

Average wind speed in September
Belmont, MA

Average wind speed in September - Belmont, MA
  • Average wind speed in September: 6.5mph

The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

[Resources]

Average humidity in September
Belmont, MA

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

The month with the highest relative humidity is February (78%).
The month with the lowest relative humidity is April (70%).

[Resources]

Average rainfall in September
Belmont, MA

Average rainfall in September - Belmont, MA
  • Average rainfall in September: 1.3"

The wettest month (with the highest rainfall) is December (2.95").
The driest month (with the least rainfall) is September (1.3").

[Resources]

Average rainfall days in September
Belmont, MA

Average rainfall days in September - Belmont, MA
  • Average rainfall days in September: 10.7 days

The months with the highest number of rainy days are May and July (15.3 days).
The month with the least rainy days is January (7.8 days).

[Resources]

Average snowfall in September
Belmont, MA

Average snowfall in September - Belmont, 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").

[Resources]

Average snowfall days in September
Belmont, MA

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

The month with the highest number of snowfall days is January (7.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

[Resources]

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

Average daylight in September / Average sunshine in September - Belmont, 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).

[Resources]

Average sunshine days in September
Belmont, MA

Average sunshine days in September - Belmont, MA
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is November (17.6 days).
The month with the least sunshine days is April (13.3 days).

[Resources]

Average UV index in September
Belmont, MA

Average UV index in September - Belmont, 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).

[Resources]

Average cloud cover in September
Belmont, MA

Average cloud cover in September - Belmont, 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).

[Resources]

Average visibility in September
Belmont, MA

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

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

[Resources]

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location
* you will be automatically redirected to the weather forecast for your location