September weather forecast
Dover, DE

The public Archives building in Dover, Delaware, between two large trees
The public Archives building in Dover, Delaware, between two large trees

Weather in September

The first month of the autumn, September, is also a moderately hot month in Dover, Delaware, with temperature in the range of an average low of 63°F (17.2°C) and an average high of 76.3°F (24.6°C).

Temperature

In Dover, Delaware, the average high-temperature in September slightly decreases from 81.9°F (27.7°C) in August to a still warm 76.3°F (24.6°C). The average low-temperature, is 63°F (17.2°C).

Humidity

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

Rainfall

In September, the rain falls for 12.9 days. Throughout September, 1.89" (48mm) of precipitation is accumulated. In Dover, during the entire year, the rain falls for 152.3 days and collects up to 26.3" (668mm) of precipitation.

Snowfall

April through November are months without snowfall in Dover.

Daylight

The average length of the day in September is 12h and 26min.
On the first day of September in Dover, 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 Dover, the average sunshine in September is 9.2h.

UV index

In September, the average daily maximum UV index in Dover is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the average person.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
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.
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FAQ

What is the average humidity in September in Dover?

The average relative humidity in September in Dover is 78%.

How much does it rain in Dover in September?

In Dover, Delaware, in September, during 12.9 rainfall days, 1.89" (48mm) of precipitation is typically accumulated.

When it does not snow in Dover?

April through November are months without snowfall.

How many hours of daylight does Dover have in September?

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

What time are sunrise and sunset in September in Dover?

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, sunrise is at 6:57 am and sunset at 6:46 pm EDT.

How long on average sun shines in September in Dover?

The average sunshine duration in September in Dover is 9.2h.

How high is the UV index in September in Dover?

In September, the average daily maximum UV index in Dover is 5. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to the Sun's UV radiation.
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
Dover, DE

Average temperature in September - Dover, DE
  • Average high temperature in September: 76.3°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (39.7°F).

  • Average low temperature in September: 63°F

The month with the highest average low temperature is July (70°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).

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Average pressure in September
Dover, DE

Average pressure in September - Dover, 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).

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Average wind speed in September
Dover, DE

Average wind speed in September - Dover, DE
  • Average wind speed in September: 7.3mph

The windiest month (with the highest average wind speed) is February (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

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Average humidity in September
Dover, DE

Average humidity in September - Dover, DE
  • Average humidity in September: 78%

The month with the highest relative humidity is May (79%).
The months with the lowest relative humidity are January, March, April and November (74%).

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Average rainfall in September
Dover, DE

Average rainfall in September - Dover, DE
  • Average rainfall in September: 1.89"

The wettest month (with the highest rainfall) is August (3.15").
The driest month (with the least rainfall) is January (1.46").

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Average rainfall days in September
Dover, DE

Average rainfall days in September - Dover, DE
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is November (8.1 days).

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Average snowfall in September
Dover, DE

Average snowfall in September - Dover, DE
  • Average snowfall in September: 0"

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

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Average snowfall days in September
Dover, DE

Average snowfall days in September - Dover, DE
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (3.5 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).

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Average daylight in September /
Average sunshine in September
Dover, DE

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

The month with the longest days is June (Average daylight: 14h and 53min).
The month with the shortest days is December (Average daylight: 9h and 28min).

  • Average sunshine in September: 9h and 12min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days in September
Dover, DE

Average sunshine days in September - Dover, DE
  • Average sunshine days in September: 14.9 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (10.8 days).

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Average UV index in September
Dover, DE

Average UV index in September - Dover, 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).

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Average cloud cover in September
Dover, DE

Average cloud cover in September - Dover, DE
  • Average cloud cover in September: 33

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 28).

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Average visibility in September
Dover, DE

Average visibility in September - Dover, 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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