September weather forecast
South Chatham, MA

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Weather in September

The first month of the autumn, September, is still a comfortable month in South Chatham, Massachusetts, with an average temperature ranging between min 63.3°F (17.4°C) and max 66.6°F (19.2°C).

Temperature

In South Chatham, September's average high-temperature stands at a refreshing 66.6°F (19.2°C), closely related to the preceding month. Registering an almost steady temperature, South Chatham's nights in September see an average low of 63.3°F (17.4°C).

Humidity

The average relative humidity in September is 80%.

Rainfall

In South Chatham, Massachusetts, in September, it is raining for 10.7 days, with typically 1.85" (47mm) of accumulated precipitation. Throughout the year, there are 142.4 rainfall days, and 22.09" (561mm) of precipitation is accumulated.

Snowfall

May through October are months without snowfall in South Chatham.

Daylight

The average length of the day in September is 12h and 28min.
On the first day of the month, sunrise is at 6:06 am and sunset at 7:12 pm. On the last day of September, in South Chatham, sunrise is at 6:36 am and sunset at 6:23 pm EDT.

Sunshine

In South Chatham, the average sunshine in September is 8.5h.

UV index

In September, the average daily maximum UV index is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.
Note: In September, an average UV index of 4 transforms into the following instructions:
Take precautions - Protection against sun damage is advised. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
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Frequently asked questions

What is the average September temperature in South Chatham?

The average high-temperature, in September, in South Chatham, is 66.6°F (19.2°C), while the average low-temperature is 63.3°F (17.4°C).

What is the average humidity in September in South Chatham?

The average relative humidity in September in South Chatham is 80%.

How much does it rain in South Chatham in September?

In South Chatham, Massachusetts, in September, it is raining for 10.7 days, with typically 1.85" (47mm) of accumulated precipitation.

When it does not snow in South Chatham?

May through October are months without snowfall in South Chatham, Massachusetts.

What is the average length of the day in September in South Chatham?

In September, the average day length in South Chatham, Massachusetts, is 12h and 28min.

What time are sunrise and sunset in September in South Chatham?

In September, on the first day of the month, sunrise is at 6:06 am and sunset at 7:12 pm. On the last day of the month, in South Chatham, Massachusetts, sunrise is at 6:36 am and sunset at 6:23 pm EDT.

How long on average sun shines in September in South Chatham?

In South Chatham, the average sunshine duration in September is 8.5h.

How high is the UV index in September in South Chatham?

In South Chatham, the average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium health risk from unprotected exposure to UV radiation.
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
South Chatham, MA

Average temperature in September - South Chatham, MA
  • Average high temperature in September: 66.6°F

The warmest month (with the highest average high temperature) is August (71.6°F).
The months with the lowest average high temperature are January and February (39°F).

  • Average low temperature in September: 63.3°F

The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (31.6°F).

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Average pressure in September
South Chatham, MA

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

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed in September
South Chatham, MA

Average wind speed in September - South Chatham, MA
  • Average wind speed in September: 13.5mph

The windiest month (with the highest average wind speed) is January (18mph).
The calmest month (with the lowest average wind speed) is August (11.4mph).

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Average humidity in September
South Chatham, MA

Average humidity in September - South Chatham, MA
  • Average humidity in September: 80%

The months with the highest relative humidity are June and July (85%).
The month with the lowest relative humidity is November (74%).

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Average rainfall in September
South Chatham, MA

Average rainfall in September - South Chatham, MA
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is November (1.46").

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Average rainfall days in September
South Chatham, MA

Average rainfall days in September - South Chatham, MA
  • Average rainfall days in September: 10.7 days

The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is February (8.3 days).

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Average snowfall in September
South Chatham, MA

Average snowfall in September - South Chatham, MA
  • Average snowfall in September: 0"

The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
South Chatham, MA

Average snowfall days in September - South Chatham, MA
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in September /
Average sunshine in September
South Chatham, MA

Average daylight in September / Average sunshine in September - South Chatham, 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 12min).

  • Average sunshine in September: 8h and 3min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

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Average sunshine days in September
South Chatham, MA

Average sunshine days in September - South Chatham, MA
  • Average sunshine days in September: 16.9 days

The month with the most sunshine days is August (17.6 days).
The month with the least sunshine days is January (13 days).

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Average UV index in September
South Chatham, MA

Average UV index in September - South Chatham, MA
  • Average UV index in September: 4

The months with the highest UV index are 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
South Chatham, MA

Average cloud cover in September - South Chatham, MA
  • Average cloud cover in September: 32

The month with the most cloud cover is December (Cloud cover 54).
The month with the least cloud cover is August (Cloud cover 27).

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Average visibility in September
South Chatham, MA

Average visibility in September - South Chatham, 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).

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South Chatham, Massachusetts, USA

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