Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
South Dennis's transition into September involves a gentle shift in temperature, receding from 79.9°F (26.6°C) in August to a still warm 73.9°F (23.3°C). September nighttime temperatures hover close to the daytime peak with an average of 66.2°F (19°C).Humidity
In South Dennis, the average relative humidity in September is 77%.Rainfall
In South Dennis, in September, it is raining for 10.6 days, with typically 0.91" (23mm) of accumulated precipitation. Throughout the year, there are 130.8 rainfall days, and 13.23" (336mm) of precipitation is accumulated.Snowfall
In South Dennis, snow does not fall in April through October.Daylight
In South Dennis, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:28 am and sunset at 7:29 pm. On the last day of September, sunrise is at 6:55 am and sunset at 6:43 pm EDT.
Sunshine
In South Dennis, the average sunshine in September is 9.5h.UV index
The average daily maximum UV index in September in South Dennis is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, the maximum UV index of 5 suggests these recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When it does not snow in South Dennis?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
South Dennis, NJ
- Average high temperature in September: 73.9°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (40.1°F).
- Average low temperature in September: 66.2°F
The month with the highest average low temperature is July (72.1°F).
The coldest month (with the lowest average low temperature) is January (31.3°F).
Average pressure in September
South Dennis, NJ
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
South Dennis, NJ
- Average wind speed in September: 9.5mph
The windiest month (with the highest average wind speed) is January (11.9mph).
The calmest months (with the lowest average wind speed) are July and August (8.1mph).
Average humidity in September
South Dennis, NJ
- Average humidity in September: 77%
The month with the highest relative humidity is May (81%).
The month with the lowest relative humidity is November (73%).
Average rainfall in September
South Dennis, NJ
- Average rainfall in September: 0.91"
The wettest month (with the highest rainfall) is August (1.61").
The driest month (with the least rainfall) is January (0.67").
Average rainfall days in September
South Dennis, NJ
- Average rainfall days in September: 10.6 days
The month with the highest number of rainy days is July (15.2 days).
The month with the least rainy days is January (7 days).
Average snowfall in September
South Dennis, NJ
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.59").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
South Dennis, NJ
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.7 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
South Dennis, NJ
- 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 3min
The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
South Dennis, NJ
- Average sunshine days in September: 17.4 days
The month with the most sunshine days is November (20.4 days).
The month with the least sunshine days is July (13.4 days).
Average UV index in September
South Dennis, NJ
- Average UV index in September: 5
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 and December (UV index 2).
Average cloud cover in September
South Dennis, NJ
- Average cloud cover in September: 29
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 25).
Average visibility in September
South Dennis, NJ
- 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).
South Dennis, New Jersey, USA
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