September weather forecast
Newton, MA

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Ancient historic buildings within the Union Historic District in Newton City, Massachusetts
Ancient historic buildings within the Union Historic District in Newton City, Massachusetts

Weather in September

September brings a noticeable change in Newton's weather, with the summer heat beginning to wane. September days can expect temperatures from 56.3°F (13.5°C) to 73°F (22.8°C), ushering the season of harvests. While the wind speeds experience a minor increase, they do not significantly impact the prevailing conditions. Coupled with dropping temperatures, the shortening daylight hints towards the upcoming fall. Hence, September acts as a month of transition, bidding goodbye to the summer and progressively welcoming autumn.

Temperature

The arrival of September signals a subtle shift in temperature, down from a moderately hot 81°F (27.2°C) in August to an agreeable 73°F (22.8°C). September's nights observe an average temperature of 56.3°F (13.5°C).

Humidity

In September, the average relative humidity is 76%.

Rainfall

September is the month with the least rainfall. Rain falls for 6.6 days and accumulates 0.24" (6mm) of precipitation.

Snowfall

In Newton, snow does not fall in June through October.

Daylight

In Newton, the average length of the day in September is 12h and 28min.
On the first day of September in Newton, Massachusetts, sunrise is at 6:10 am and sunset at 7:18 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:27 pm EDT.

Sunshine

In September, the average sunshine is 8.6h.

UV index

The average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: In September, the maximum UV index of 4 suggests this advice:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation.

Frequently asked questions

What is the temperature in September in Newton?

The average high-temperature and low-temperature during September are 73°F (22.8°C) and 56.3°F (13.5°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is appraised at 84.2°F (29°C).

What is the average humidity in September?

In September, the average relative humidity in Newton is 76%.

What is the driest month?

The month with the least rainfall is September, when the rain falls for 6.6 days and typically collects 0.24" (6mm) of precipitation.

How much does it rain in September?

In Newton, during September, the rain falls for 6.6 days and regularly aggregates up to 0.24" (6mm) of precipitation.

When it does not snow?

In Newton, snow does not fall in June through October.

What is the average length of the day in September?

In Newton, 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 7:18 pm. On the last day of the month, sunrise is at 6:41 am and sunset at 6:27 pm EDT.

How long on average sun shines in September?

The average sunshine duration in September is 8.6h.

How high is the UV index in September?

The average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe 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
Newton, MA

Average temperature in September - Newton, MA
  • Average high temperature in September: 73°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 (33.6°F).

  • Average low temperature in September: 56.3°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (21.7°F).

Average pressure in September
Newton, MA

Average pressure in September - Newton, 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).

Average wind speed in September
Newton, MA

Average wind speed in September - Newton, MA
  • Average wind speed in September: 6.3mph

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

Average humidity in September
Newton, MA

Average humidity in September - Newton, MA
  • Average humidity in September: 76%

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

Average rainfall in September
Newton, MA

Average rainfall in September - Newton, MA
  • Average rainfall in September: 0.24"

The wettest month (with the highest rainfall) is November (0.67").
The driest month (with the least rainfall) is September (0.24").

Average rainfall days in September
Newton, MA

Average rainfall days in September - Newton, MA
  • Average rainfall days in September: 6.6 days

The month with the highest number of rainy days is July (10.2 days).
The month with the least rainy days is February (4.1 days).

Average snowfall in September
Newton, MA

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

The month with the highest snowfall is December (0.91").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in September
Newton, MA

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

The month with the highest number of snowfall days is January (4.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Newton, 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 4min

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).

Average sunshine days in September
Newton, MA

Average sunshine days in September - Newton, MA
  • Average sunshine days in September: 21.4 days

The months with the most sunshine days are January and November (22.5 days).
The month with the least sunshine days is June (17.5 days).

Average UV index in September
Newton, MA

Average UV index in September - Newton, 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
Newton, MA

Average cloud cover in September - Newton, 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).

Average visibility in September
Newton, MA

Average visibility in September - Newton, 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).

Newton, Massachusetts, USA

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