September weather forecastSouth Bethany, DE
September
Weather in September
September brings with it the beginnings of a seasonal transition in South Bethany, Delaware. The city witnesses an appreciable decrease in temperature from the hotter months of July and August. However, precipitation lowers from the year's high at an average of 1.77" (45mm), suggesting September may be a more comfortable outdoor month. The arrival of fall colors start to cloak the city, creating beautiful scenic views. This period offers a relief from the intense summer heat and leads the way into cooler, calmer weather patterns.Temperature
The high-temperature average in September for South Bethany is a still warm 74.3°F (23.5°C), staying closely aligned with August's conditions. South Bethany's nighttime temperatures in September display a slight drop from daytime highs, averaging to a pleasant 68.9°F (20.5°C).Humidity
In South Bethany, the average relative humidity in September is 77%.Rainfall
In South Bethany, in September, during 12.6 rainfall days, 1.77" (45mm) of precipitation is typically accumulated. In South Bethany, during the entire year, the rain falls for 147.8 days and collects up to 23.98" (609mm) of precipitation.Snowfall
April through November are months without snowfall in South Bethany.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:29 pm. On the last day of September, in South Bethany, sunrise is at 6:55 am and sunset at 6:44 pm EDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
The average daily maximum UV index in September in South Bethany is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Be vigilant - A duty to shield skin and eyes from injury exists. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
South Bethany, DE
- Average high temperature in September: 74.3°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (41.7°F).
- Average low temperature in September: 68.9°F
The month with the highest average low temperature is July (73.9°F).
The coldest month (with the lowest average low temperature) is January (33.4°F).
Average pressure in September
South Bethany, 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
South Bethany, DE
- Average wind speed in September: 11.2mph
The windiest month (with the highest average wind speed) is January (13.5mph).
The calmest month (with the lowest average wind speed) is August (9.3mph).
Average humidity in September
South Bethany, DE
- Average humidity in September: 77%
The month with the highest relative humidity is May (82%).
The month with the lowest relative humidity is November (73%).
Average rainfall in September
South Bethany, DE
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is August (2.68").
The driest month (with the least rainfall) is January (1.38").
Average rainfall days in September
South Bethany, DE
- Average rainfall days in September: 12.6 days
The month with the highest number of rainy days is July (15.6 days).
The month with the least rainy days is January (8.5 days).
Average snowfall in September
South Bethany, DE
- Average snowfall in September: 0"
The month with the highest snowfall is January (0.55").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
South Bethany, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.8 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
South Bethany, DE
- Average daylight in September: 12h and 24min
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 18min
The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).
Average sunshine days in September
South Bethany, DE
- Average sunshine days in September: 14.7 days
The months with the most sunshine days are January and November (18.4 days).
The month with the least sunshine days is August (13.2 days).
Average UV index in September
South Bethany, 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 and December (UV index 2).
Average cloud cover in September
South Bethany, DE
- Average cloud cover in September: 32
The months with the most cloud cover are February, March and December (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
South Bethany, 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).
