September weather forecast
Cape Saint John, MD

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Weather in September

September, the first month of the autumn in Cape Saint John, is still a warm month, with temperature in the range of an average high of 77°F (25°C) and an average low of 64.6°F (18.1°C).

Temperature

Cape Saint John in September undergoes a slight reduction in the average high-temperature, shifting from August's warm 83.3°F (28.5°C) to a still moderately hot 77°F (25°C). In the month of September, the temperature in Cape Saint John, Maryland, generally rests at an average low of 64.6°F (18.1°C).

Humidity

In Cape Saint John, the average relative humidity in September is 75%.

Rainfall

In September, in Cape Saint John, the rain falls for 10.5 days. Throughout September, 0.63" (16mm) of precipitation is accumulated. In Cape Saint John, Maryland, during the entire year, the rain falls for 120.4 days and collects up to 10.47" (266mm) of precipitation.

Snowfall

In Cape Saint John, snow does not fall in April through October.

Daylight

In Cape Saint John, Maryland, the average length of the day in September is 12h and 26min.
On the first day of September in Cape Saint John, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:50 pm EDT.

Sunshine

In Cape Saint John, Maryland, the average sunshine in September is 9.2h.

UV index

In Cape Saint John, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum daily UV index of 5 during September morphs into the following directions:
Be vigilant - Suggestions to stave off sun damage are provided. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
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Frequently asked questions

What is the average September temperature in Cape Saint John?

The high-temperature in Cape Saint John, Maryland, during September is 77°F (25°C) and the low-temperature is 64.6°F (18.1°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is calculated to be 89.6°F (32°C).

What is the average humidity in September in Cape Saint John?

In September, the average relative humidity in Cape Saint John is 75%.

How many days does it rain in September in Cape Saint John?

In September, the rain falls for 10.5 days. Throughout September, 0.63" (16mm) of precipitation is accumulated.

When it does not snow in Cape Saint John?

In Cape Saint John, Maryland, snow does not fall in April through October.

What is the average length of the day in September in Cape Saint John?

In September, the average day length is 12h and 26min.

What time are sunrise and sunset in September in Cape Saint John?

In September, on the first day of the month, sunrise is at 6:35 am and sunset at 7:36 pm. On the last day of the month, in Cape Saint John, sunrise is at 7:01 am and sunset at 6:50 pm EDT.

How many hours of sunshine does Cape Saint John have in September?

In Cape Saint John, Maryland, the average sunshine duration in September is 9.2h.

How high is the UV index in September in Cape Saint John?

In Cape Saint John, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unsafe exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
83.3°F 28.5°C
77°F 25°C
66.2°F 19°C
Average low temperature
70.5°F 21.4°C
64.6°F 18.1°C
54.5°F 12.5°C
Average pressure
29.99" 762mmHg
30.05" 763mmHg
30.03" 763mmHg
Average wind speed
6.6mph 10.6km/h
7.6mph 12.2km/h
9mph 14.5km/h
Average max. wind speed
7.2mph 11.6km/h
7.9mph 12.7km/h
9.7mph 15.6km/h
Average wind speed gusts
10.5mph 16.9km/h
11.9mph 19.2km/h
14.5mph 23.3km/h
Average humidity
74%
75%
75%
Average rainfall
1.69" 43mm
0.63" 16mm
0.87" 22mm
Average rainfall days
14.3
10.5
8.8
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average daylight
13h 4min
12h 2min
11h 1min
Average sunshine
10h 3min
9h 1min
5h 4min
Average sunshine days
13.8
17.4
20
Average UV index
6
5
4
Average cloud cover
29%
33%
37%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in September
Cape Saint John, MD

Average temperature in September - Cape Saint John, MD
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (40.3°F).

  • Average low temperature in September: 64.6°F

The month with the highest average low temperature is July (72°F).
The coldest month (with the lowest average low temperature) is January (29.8°F).

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Average pressure in September
Cape Saint John, MD

Average pressure in September - Cape Saint John, MD
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in September
Cape Saint John, MD

Average wind speed in September - Cape Saint John, MD
  • Average wind speed in September: 7.6mph

The windiest month (with the highest average wind speed) is January (10mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).

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Average humidity in September
Cape Saint John, MD

Average humidity in September - Cape Saint John, MD
  • Average humidity in September: 75%

The month with the highest relative humidity is May (78%).
The months with the lowest relative humidity are January, March, April and November (72%).

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Average rainfall in September
Cape Saint John, MD

Average rainfall in September - Cape Saint John, MD
  • Average rainfall in September: 0.63"

The wettest month (with the highest rainfall) is August (1.69").
The driest month (with the least rainfall) is January (0.47").

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Average rainfall days in September
Cape Saint John, MD

Average rainfall days in September - Cape Saint John, MD
  • Average rainfall days in September: 10.5 days

The months with the highest number of rainy days are July and August (14.3 days).
The month with the least rainy days is November (5.3 days).

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Average snowfall in September
Cape Saint John, MD

Average snowfall in September - Cape Saint John, MD
  • Average snowfall in September: 0"

The month with the highest snowfall is January (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in September
Cape Saint John, MD

Average snowfall days in September - Cape Saint John, MD
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is February (2.5 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
Cape Saint John, MD

Average daylight in September / Average sunshine in September - Cape Saint John, MD
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days in September
Cape Saint John, MD

Average sunshine days in September - Cape Saint John, MD
  • Average sunshine days in September: 17.4 days

The month with the most sunshine days is November (23.4 days).
The month with the least sunshine days is August (13.8 days).

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Average UV index in September
Cape Saint John, MD

Average UV index in September - Cape Saint John, MD
  • Average UV index in September: 5

The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).

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Average cloud cover in September
Cape Saint John, MD

Average cloud cover in September - Cape Saint John, MD
  • Average cloud cover in September: 33

The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 28).

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Average visibility in September
Cape Saint John, MD

Average visibility in September - Cape Saint John, MD
  • 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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Cape Saint John, Maryland, USA

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