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Charlestown weather in September

Weather in Charlestown: September


	Average day temperature:	70.0°F
	Average night temperature:	62.5°F

	Sea water temperature:	68.6°F

	Number of sunny days:	14 days
	Day length:	11.8 - 13.1 hours

	Number of rainy days:	2 days
	Precipitation totals:	1.3 in.

more information

14 days
forecast

Charlestown

sea water
temperature

Charlestown

January
February
March
April

May
June
July
August

September
October
November
December

Show year:

2024

2023

2022

Day temperature

Night temperature

The highest day temperature during September of 2024 was 72°F. At the same time the lowest night temperature was 57°F. Daily and nightly averages during September were 67.2°F and 62.3°F.

Show year:

2024

2023

2022

The average sea water temperature in September of 2024 was 67.0°F. The highest and lowest sea temperatures during the month were 69.3°F and 64.6°F.

	Sunny days
	Partly cloudy days
	Cloudy days

47%

30%

23%

Mostly all days in September are sunny but cloudy days are also possible.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

0.3

0.5

0.8

1.1

1.3

1.6

1.8

1.4

1.1

1.5

1.2

1.1

1.4

1.5

1.3

1.1

1.3

1.4

1.1

1.5

1.3

1.2

1.1

1.4

1.5

1.3

1.1

1.3

Precipitation total value in Charlestown in September is 1.3 in. Other months of the year show relatively similar values.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

2.2

4.4

6.7

8.9

11.1

13.3

15.6

17.8

12.4

11.9

10.1

8.9

8.6

9.3

10.2

11.4

13.0

12.2

12.9

12.4

11.9

10.1

9.7

8.9

8.6

9.3

10.2

11.4

13.0

12.2

12.9

The average wind speed value in September is 9.7 mph It makes September one of the least windy months of the year.

jan

feb

mar

apr

may

jun

jul

aug

sep

oct

nov

dec

0.0

1.5

3.0

4.5

6.0

7.5

8.9

10.4

11.9

4.9

6.6

6.4

8.2

8.5

8.7

8.3

6.7

6.3

5.3

4.9

6.6

6.4

7.6

8.2

8.5

8.7

8.3

6.7

6.3

5.3

4.9

This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in September is: 7.6.