September weather forecast
Delaware City, DE

Weather in September

The first month of the autumn, September, is still a warm month in Delaware City, Delaware, with an average temperature fluctuating between 77°F (25°C) and 60.8°F (16°C).

Temperature

In September, the average high-temperature marginally drops from 83.5°F (28.6°C) in August to a still warm 77°F (25°C). In Delaware City, the average low-temperature is 60.8°F (16°C).

Humidity

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

Rainfall

In September, in Delaware City, the rain falls for 12.5 days. Throughout September, 1.65" (42mm) of precipitation is accumulated. In Delaware City, during the entire year, the rain falls for 145.9 days and collects up to 24.45" (621mm) of precipitation.

Snowfall

In Delaware City, Delaware, snow does not fall in May through October.

Ocean temperature

In Delaware City, Delaware, in September, the average water temperature is 72.1°F (22.3°C).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 72.1°F (22.3°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)

Daylight

The average length of the day in September in Delaware City is 12h and 26min.
On the first day of September in Delaware City, sunrise is at 6:30 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:46 pm EDT.

Sunshine

In Delaware City, the average sunshine in September is 9.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for the ordinary person.
Note: The average daily UV index of 5 in September transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.
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FAQ

What is the average humidity in September in Delaware City?

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

How much does it rain in Delaware City in September?

In Delaware City, Delaware, in September, it is raining for 12.5 days, with typically 1.65" (42mm) of accumulated precipitation.

When it does not snow in Delaware City?

May through October are months without snowfall in Delaware City.

What is the water temperature in September in Delaware City?

In Delaware City, Delaware, in September, the average water temperature is 72.1°F (22.3°C). A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 72.1°F (22.3°C) water.

How many hours of daylight does Delaware City have in September?

In Delaware City, Delaware, the average day length in September is 12h and 26min.

When is the sunrise / sunset in September in Delaware City?

In September, on the first day of the month, sunrise is at 6:30 am and sunset at 7:33 pm. On the last day of the month, in Delaware City, Delaware, sunrise is at 6:57 am and sunset at 6:46 pm EDT.

How many hours of sunshine does Delaware City have in September?

In Delaware City, the average sunshine duration in September is 9.2h.

What is the UV index intensity in September in Delaware City?

In September, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a moderate vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Delaware City, DE

Average temperature in September - Delaware City, DE
  • Average high temperature in September: 77°F

The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in September: 60.8°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).

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Average pressure in September
Delaware City, DE

Average pressure in September - Delaware City, DE
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in September
Delaware City, DE

Average wind speed in September - Delaware City, DE
  • Average wind speed in September: 6.1mph

The windiest months (with the highest average wind speed) are February and March (8.9mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in September
Delaware City, DE

Average humidity in September - Delaware City, DE
  • Average humidity in September: 77%

The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in September
Delaware City, DE

Average rainfall in September - Delaware City, DE
  • Average rainfall in September: 1.65"

The wettest month (with the highest rainfall) is August (3.11").
The driest month (with the least rainfall) is January (1.54").

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Average rainfall days in September
Delaware City, DE

Average rainfall days in September - Delaware City, DE
  • Average rainfall days in September: 12.5 days

The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (7.8 days).

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Average snowfall in September
Delaware City, DE

Average snowfall in September - Delaware City, DE
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.65").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Delaware City, DE

Average snowfall days in September - Delaware City, DE
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature in September
Delaware City, DE

Average sea temperature in September - Delaware City, DE
  • Average sea temperature in September: 72.1°F

The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).

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Average daylight in September /
Average sunshine in September
Delaware City, DE

Average daylight in September / Average sunshine in September - Delaware City, DE
  • Average daylight in September: 12h and 26min

The month with the longest days is June (Average daylight: 14h and 55min).
The month with the shortest days is December (Average daylight: 9h and 26min).

  • Average sunshine in September: 9h and 12min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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Average sunshine days in September
Delaware City, DE

Average sunshine days in September - Delaware City, DE
  • Average sunshine days in September: 15.8 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is May (11.8 days).

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Average UV index in September
Delaware City, DE

Average UV index in September - Delaware City, 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, November and December (UV index 2).

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Average cloud cover in September
Delaware City, DE

Average cloud cover in September - Delaware City, DE
  • Average cloud cover in September: 36

The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in September
Delaware City, DE

Average visibility in September - Delaware City, 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).

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