September weather forecast and climate
Selbyville, DE

The first month of the autumn, September, is still a warm month in Selbyville, Delaware, with average temperature varying between 68°F (20°C) and 74.3°F (23.5°C).

Temperature

In Selbyville, the average high-temperature in September marginally drops, from a warm 79.7°F (26.5°C) in August, to a still moderately hot 74.3°F (23.5°C). In Selbyville, the average low-temperature is 68°F (20°C).

Humidity

In Selbyville, the average relative humidity is 78%.

Rainfall

In Selbyville, during September, the rain falls for 12.9 days and regularly aggregates up to 1.85" (47mm) of precipitation. Throughout the year, there are 144.6 rainfall days, and 25.51" (648mm) of precipitation is accumulated.

Snowfall

April through October are months without snowfall in Selbyville.

Daylight

In September, the average length of the day in Selbyville is 12.4h.

Sunshine

The average sunshine is 9.3h.

UV index

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The daily maximum UV index of 5 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.

What is the temperature in September in Selbyville?

In Selbyville, Delaware, in September, the average high-temperature is 74.3°F (23.5°C), and the average low-temperature is 68°F (20°C).

What is the average humidity in September in Selbyville?

In Selbyville, Delaware, the average relative humidity in September is 78%.

How much does it rain in Selbyville in September?

In September, the rain falls for 12.9 days. Throughout September, 1.85" (47mm) of precipitation is accumulated.

When it does not snow in Selbyville?

In Selbyville, Delaware, snow does not fall in April through October.

What is the average length of the day in September in Selbyville?

In Selbyville, the average length of the day in September is 12.4h.

How long on average sun shines in September in Selbyville?

In September, the average sunshine is 9.3h.

How high is the UV index in September in Selbyville?

In Selbyville, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.
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"

The month with the highest atmospheric pressure is November (30.12").
The month with the lowest atmospheric pressure is June (29.94").

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%).
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").
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).
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: 12.4h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 9.3h

The month with the most sunshine is July (Average sunshine: 10.9h).
Months with the least sunshine are February and December (Average sunshine: 5.1).

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

Months with the highest UV index are May, June, July and August (UV index 6).
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

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).