Cambridge
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Cambridge, MA

A beautiful view of the John Weeks Memorial Footbridge in Cambridge, Massachusetts, over the Charles River calm waters, and a distant view of the Havard University student residence unit
A beautiful view of the John Weeks Memorial Footbridge in Cambridge, Massachusetts, over the Charles River calm waters, and a distant view of the Havard University student residence unit
The first month of the autumn, September, is still a pleasant month in Cambridge, Massachusetts, with average temperature varying between 56.7°F (13.7°C) and 72.9°F (22.7°C).

Temperature

In September, the average high-temperature slightly decreases, 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 Cambridge, is 56.7°F (13.7°C).

Humidity

In September, the average relative humidity is 75%.

Rainfall

The month with the least rainfall in Cambridge is September when the rain falls for 6.4 days and typically collects 0.2" (5mm) of precipitation.

Snowfall

In Cambridge snow does not fall in June through October.

Daylight

The average length of the day in September is 12.5h.

Sunshine

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

UV index

The average daily maximum UV index in Cambridge is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 4 translate into the following recommendations:
Take precautions - Protection against the skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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.

What is the temperature in September in Cambridge?

The average high-temperature, in September, in Cambridge, is 72.9°F (22.7°C), while the average low-temperature is 56.7°F (13.7°C).

What is the average humidity in September in Cambridge?

In September, the average relative humidity in Cambridge, Massachusetts, is 75%.

How much does it rain in Cambridge in September?

In Cambridge, Massachusetts, in September, it is raining for 6.4 days, with typically 0.2" (5mm) of accumulated precipitation.

What is the driest month in Cambridge?

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

When it does not snow in Cambridge?

In Cambridge snow does not fall in June through October.

How many hours of daylight does Cambridge have in September?

In September, the average length of the day in Cambridge is 12.5h.

How long on average sun shines in September in Cambridge?

The average sunshine in September in Cambridge is 8.5h.

How high is the UV index in September in Cambridge?

In September, the average daily maximum UV index in Cambridge, Massachusetts, is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to the UV radiation.
Average temperature in September - Cambridge, 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).

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

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

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

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

Average rainfall days in September - Cambridge, 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 lowest number of rainy days is January (4.3 days).

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

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

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

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

Average daylight in September / Average sunshine in September - Cambridge, MA
  • Average daylight in September: 12.5h

The month with the longest days is June (Average daylight: 15.2h).
The month with shortest days is December (Average daylight: 9.1h).

  • Average sunshine in September: 8.5h

The month with most sunshine is August (Average sunshine: 10.5h).
The month with least sunshine is February (Average sunshine: 4.7h).

Average UV index in September - Cambridge, MA
  • 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).