September weather forecast and climate
South Bethany, DE

The first month of the autumn, September, is also a moderately hot month in South Bethany, Delaware, with temperature in the range of an average high of 74.3°F (23.5°C) and an average low of 68.9°F (20.5°C).

Temperature

In September, the average high-temperature is relatively the same as in August - a still moderately hot 74.3°F (23.5°C). In September, the average low-temperature is 68.9°F (20.5°C).

Humidity

In South Bethany, the average relative humidity 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, Delaware.

Daylight

In South Bethany, Delaware, the average length of the day is 12.4h.

Sunshine

In South Bethany, Delaware, the average sunshine is 9.3h.

UV index

In South Bethany, the average daily maximum UV index is 5. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to the UV radiation for the average person.
Note: The average daily UV index of 5 transform into the following instructions:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.

What is the temperature in September in South Bethany?

The average high-temperature, in September, in South Bethany, Delaware, is 74.3°F (23.5°C), while the average low-temperature is 68.9°F (20.5°C).

What is the average humidity in September in South Bethany?

In September, the average relative humidity in South Bethany, Delaware, is 77%.

How many days does it rain in September in South Bethany?

In September, in South Bethany, the rain falls for 12.6 days. Throughout September, 1.77" (45mm) of precipitation is accumulated.

When it does not snow in South Bethany?

April through November are months without snowfall in South Bethany.

How many hours of daylight does South Bethany have in September?

The average length of the day in September is 12.4h.

How many hours of sunshine does South Bethany have in September?

In September, the average sunshine is 9.3h.

How high is the UV index in September in South Bethany?

In South Bethany, Delaware, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unprotected exposure to the UV radiation.
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"

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 - 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").
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).
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: 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).
The month with the least sunshine is February (Average sunshine: 5h).

Average sunshine days in September - South Bethany, DE
  • Average sunshine days in September: 14.7 days

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

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 - South Bethany, DE
  • Average cloud cover in September: 32

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

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).