September weather forecast
Bolton, MA

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Weather in September

September, the first month of the autumn in Bolton, is also an agreeable month, with an average temperature fluctuating between 72.5°F (22.5°C) and 54°F (12.2°C).

Temperature

With the onset of September, Bolton's average high-temperature slightly adjusts, moderately receding from August's moderately hot 80.1°F (26.7°C) to an agreeable 72.5°F (22.5°C). September's nights in Bolton observe an average temperature of 54°F (12.2°C).

Humidity

In September, the average relative humidity in Bolton is 78%.

Rainfall

The month with the least rainfall in Bolton is September, when the rain falls for 12.3 days and typically collects 1.57" (40mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in September is 12h and 29min.
On the first day of September, sunrise is at 6:12 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 6:43 am and sunset at 6:29 pm EDT.

Sunshine

The average sunshine in September is 8.3h.

UV index

In September, the average daily maximum UV index in Bolton is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV radiation for average individuals.
Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Guard yourself - Precautionary measures against sun damage are advocated. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes.
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Frequently asked questions

What is the usual temperature for Bolton in September?

The high-temperature, in September, in Bolton, is 72.5°F (22.5°C), while the low-temperature averages to 54°F (12.2°C). In July, the average heat index (a.k.a. 'feels like', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is estimated at 87.8°F (31°C).

What is the average humidity in September in Bolton?

In September, the average relative humidity is 78%.

What is the driest month in Bolton?

The month with the least rainfall is September, when the rain falls for 12.3 days and typically collects 1.57" (40mm) of precipitation.

How much does it rain in Bolton in September?

In Bolton, during September, the rain falls for 12.3 days and regularly aggregates up to 1.57" (40mm) of precipitation.

When it does not snow in Bolton?

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

Does it snow in Bolton in September?

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

How many hours of daylight does Bolton have in September?

In September, the average day length is 12h and 29min.

What time are sunrise and sunset in September in Bolton?

In September, on the first day of the month, sunrise is at 6:12 am and sunset at 7:20 pm. On the last day of the month, in Bolton, sunrise is at 6:43 am and sunset at 6:29 pm EDT.

How long on average sun shines in September in Bolton?

In September, the average sunshine duration is 8.3h.

How high is the UV index in September in Bolton?

The average daily maximum UV index in September is 4. A UV Index reading 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
Bolton, MA

Average temperature in September - Bolton, MA
  • Average high temperature in September: 72.5°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 (31.5°F).

  • Average low temperature in September: 54°F

The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in September
Bolton, MA

Average pressure in September - Bolton, 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).

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Average wind speed in September
Bolton, MA

Average wind speed in September - Bolton, MA
  • Average wind speed in September: 5.9mph

The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in September
Bolton, MA

Average humidity in September - Bolton, MA
  • Average humidity in September: 78%

The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (71%).

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Average rainfall in September
Bolton, MA

Average rainfall in September - Bolton, MA
  • Average rainfall in September: 1.57"

The wettest month (with the highest rainfall) is December (2.91").
The driest month (with the least rainfall) is September (1.57").

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Average rainfall days in September
Bolton, MA

Average rainfall days in September - Bolton, MA
  • Average rainfall days in September: 12.3 days

The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (7.3 days).

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Average snowfall in September
Bolton, MA

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

The month with the highest snowfall is February (6.1").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Bolton, MA

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

The month with the highest number of snowfall days is February (9.4 days).
The 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
Bolton, MA

Average daylight in September / Average sunshine in September - Bolton, 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 12min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

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Average sunshine days in September
Bolton, MA

Average sunshine days in September - Bolton, MA
  • Average sunshine days in September: 15.1 days

The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is July (12.8 days).

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Average UV index in September
Bolton, MA

Average UV index in September - Bolton, 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).

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Average cloud cover in September
Bolton, MA

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

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 34).

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Average visibility in September
Bolton, MA

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

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

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Bolton, Massachusetts, USA

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