September weather forecastSelbyville, DE
September
Weather in September
September graces Selbyville with a transition period, marking the end of summer and the advent of fall. The highest temperature averages around 74.3°F (23.5°C), and rainfall is registered at 1.85" (47mm). Slightly cooler weather becomes recurrent towards the latter half of the month, and the air briskness denotes the impending change. As September eases out of summer, daylight hours start to shorten, and leaves begin to color. Anticipating the gradual transition, September sets the trend for the arrival of the quintessential fall months.Temperature
Selbyville's weather in September involves a mild decrease in the average high-temperature, moving down slightly from August's 79.7°F (26.5°C) to a still warm 74.3°F (23.5°C). During the September nights, Selbyville's temperature maintains an average close to the daytime highs, settling at an agreeable 68°F (20°C).Humidity
In September, the average relative humidity is 78%.Rainfall
In September, the rain falls for 12.9 days. Throughout September, 1.85" (47mm) of precipitation is accumulated. In Selbyville, during the entire year, the rain falls for 144.6 days and collects up to 25.51" (648mm) of precipitation.Snowfall
In Selbyville, snow does not fall in April through October.Daylight
In September, the average length of the day in Selbyville is 12h and 25min.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, sunrise is at 6:56 am and sunset at 6:44 pm EDT.
Sunshine
The average sunshine in September in Selbyville is 9.3h.UV index
In September, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: A maximum high daily UV index of 5 during September translates into the following directions:
Take necessary precautions - Suggestions to elude sunburn are provided. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Selbyville, DE
- Average high temperature in September: 74.3°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 (42.1°F).
- Average low temperature in September: 68°F
The month with the highest average low temperature is July (73.4°F).
The coldest month (with the lowest average low temperature) is January (32.9°F).
Average pressure in September
Selbyville, 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
Selbyville, DE
- Average wind speed in September: 10.6mph
The windiest month (with the highest average wind speed) is January (12.8mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).
Average humidity in September
Selbyville, DE
- Average humidity in September: 78%
The month with the highest relative humidity is May (82%).
The months with the lowest relative humidity are January and November (74%).
Average rainfall in September
Selbyville, DE
- Average rainfall in September: 1.85"
The wettest months (with the highest rainfall) are July and August (2.87").
The driest month (with the least rainfall) is January (1.5").
Average rainfall days in September
Selbyville, DE
- Average rainfall days in September: 12.9 days
The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is January (7.4 days).
Average snowfall in September
Selbyville, DE
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.87").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Selbyville, DE
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (2.6 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
Selbyville, 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 months with the least sunshine are February and December (Average sunshine: 5h and 6min).
Average sunshine days in September
Selbyville, DE
- Average sunshine days in September: 14.7 days
The month with the most sunshine days is January (19.7 days).
The month with the least sunshine days is July (12.9 days).
Average UV index in September
Selbyville, 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
Selbyville, DE
- Average cloud cover in September: 32
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 26).
Average visibility in September
Selbyville, 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).
