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
As Dewey Beach steps into September, the average high-temperature holds at a still moderately hot 74.1°F (23.4°C), hinting at a minor fluctuation from the prior month. Dewey Beach's average nighttime temperature in September modestly descends to a refreshing 67.8°F (19.9°C).Humidity
In September, the average relative humidity is 78%.Rainfall
September is the month with the least rainfall. Rain falls for 7.5 days and accumulates 0.28" (7mm) of precipitation.Snowfall
In Dewey Beach, snow does not fall in April through October.Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:30 pm. On the last day of September, in Dewey Beach, sunrise is at 6:55 am and sunset at 6:44 pm EDT.
Sunshine
In Dewey Beach, Delaware, the average sunshine in September is 9.6h.UV index
The average daily maximum UV index in September in Dewey Beach is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: A typical high UV index of 5 in September suggests the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. The solar radiation around mid-day is intense; avoid the Sun and stay safe. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Frequently asked questions
What is the usual temperature for Dewey Beach in September?
What is the average humidity in September in Dewey Beach?
What is the driest month in Dewey Beach?
How much does it rain in Dewey Beach in September?
When it does not snow in Dewey Beach?
What is the average length of the day in September in Dewey Beach?
When are sunrise and sunset in September in Dewey Beach?
How many hours of sunshine does Dewey Beach have in September?
How high is the UV index in September in Dewey Beach?
Average temperature in September
Dewey Beach, DE
- Average high temperature in September: 74.1°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (41.4°F).
- Average low temperature in September: 67.8°F
The month with the highest average low temperature is July (73.6°F).
The coldest month (with the lowest average low temperature) is January (33.1°F).
Average pressure in September
Dewey Beach, DE
- Average pressure in September: 30.04"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in September
Dewey Beach, DE
- Average wind speed in September: 10.6mph
The windiest month (with the highest average wind speed) is January (13mph).
The calmest month (with the lowest average wind speed) is August (8.8mph).
Average humidity in September
Dewey Beach, DE
- Average humidity in September: 78%
The month with the highest relative humidity is May (82%).
The month with the lowest relative humidity is November (73%).
Average rainfall in September
Dewey Beach, DE
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is October (0.71").
The driest month (with the least rainfall) is September (0.28").
Average rainfall days in September
Dewey Beach, DE
- Average rainfall days in September: 7.5 days
The month with the highest number of rainy days is July (10.2 days).
The month with the least rainy days is November (4.9 days).
Average snowfall in September
Dewey Beach, DE
- Average snowfall in September: 0"
The months with the highest snowfall are January and December (0.12").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Dewey Beach, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Dewey Beach, DE
- Average daylight in September: 12h and 2min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in September: 9h and 4min
The month with the most sunshine is July (Average sunshine: 11h and 6min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
Dewey Beach, DE
- Average sunshine days in September: 20 days
The month with the most sunshine days is January (23.5 days).
The months with the least sunshine days are June and July (18.2 days).
Average UV index in September
Dewey Beach, DE
- 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).
Average cloud cover in September
Dewey Beach, DE
- Average cloud cover in September: 30
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 24).
Average visibility in September
Dewey Beach, DE
- 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).
Dewey Beach, Delaware, USA
Weather forecast for your location
2. Allow the app to use your location
