September weather forecast
Harvard, MA

Weather in September

September, the first month of the autumn, in Harvard, is still a pleasant month, with temperature in the range of an average low of 54.5°F (12.5°C) and an average high of 73°F (22.8°C).

Temperature

In Harvard, the average high-temperature slightly decreases, from a moderately hot 80.6°F (27°C) in August, to a pleasant 73°F (22.8°C). In Harvard, Massachusetts,, the average low-temperature is 54.5°F (12.5°C).

Humidity

In September, the average relative humidity in Harvard is 77%.

Rainfall

The month with the least rainfall is September when the rain falls for 11.1 days and typically collects 1.38" (35mm) of precipitation.

Snowfall

In Harvard snow does not fall in June through September.

Daylight

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

Sunshine

In Harvard, the average sunshine in September is 8.2h.

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 the exposure to the Sun's UV rays for the ordinary person.
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 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 average humidity in September in Harvard?

In September, the average relative humidity in Harvard is 77%.

What is the driest month in Harvard?

The month with the least rainfall is September when the rain falls for 11.1 days and typically collects 1.38" (35mm) of precipitation.

How many days does it rain in September in Harvard?

In Harvard, in September, it is raining for 11.1 days, with typically 1.38" (35mm) of accumulated precipitation.

When it does not snow in Harvard?

June through September are months without snowfall.

Does it snow in Harvard in September?

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

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

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

How many hours of sunshine does Harvard have in September?

In Harvard, Massachusetts, the average sunshine in September is 8.2h.

What is the UV index reading in September in Harvard?

In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in September
Harvard, MA

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

The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (32.5°F).

  • Average low temperature in September: 54.5°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in September
Harvard, MA

Average pressure in September - Harvard, MA
  • Average pressure in September: 30.05"

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

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Average wind speed in September
Harvard, MA

Average wind speed in September - Harvard, MA
  • Average wind speed in September: 5.8mph

The windiest month (with the highest average wind speed) is January (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

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Average humidity in September
Harvard, MA

Average humidity in September - Harvard, MA
  • Average humidity in September: 77%

The month with the highest relative humidity is February (80%).
The month with the lowest relative humidity is April (70%).

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Average rainfall in September
Harvard, MA

Average rainfall in September - Harvard, MA
  • Average rainfall in September: 1.38"

The wettest month (with the highest rainfall) is October (2.68").
The driest month (with the least rainfall) is September (1.38").

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Average rainfall days in September
Harvard, MA

Average rainfall days in September - Harvard, MA
  • Average rainfall days in September: 11.1 days

The month with the highest number of rainy days is May (15.3 days).
Months with the least rainy days are January and February (6.5 days).

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Average snowfall in September
Harvard, MA

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

The month with the highest snowfall is February (6.14").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Harvard, MA

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

The month with the highest number of snowfall days is January (8.3 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in September: 8.2h

The month with the most sunshine is August (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.5h).

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Average sunshine days in September
Harvard, MA

Average sunshine days in September - Harvard, MA
  • Average sunshine days in September: 17 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is April (13.7 days).

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Average UV index in September
Harvard, MA

Average UV index in September - Harvard, 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).

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Average cloud cover in September
Harvard, MA

Average cloud cover in September - Harvard, MA
  • Average cloud cover in September: 39

The month with the most cloud cover is March (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 35).

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Average visibility in September
Harvard, MA

Average visibility in September - Harvard, MA
  • Average visibility in September: 5mi

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

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