September weather forecast and climate
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

September, the first month of the autumn, in Dover, is still a warm month, with average temperature fluctuating between 63°F (17.2°C) and 76.3°F (24.6°C).

Temperature

In Dover, Delaware, the average high-temperature marginally drops, from 81.9°F (27.7°C) in August, to a still moderately hot 76.3°F (24.6°C). In September, the average low-temperature is 63°F (17.2°C).

Humidity

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

Rainfall

In Dover, Delaware, in September, during 12.9 rainfall days, 1.89" (48mm) of precipitation is typically accumulated. Throughout the year, there are 152.3 rainfall days, and 26.3" (668mm) of precipitation is accumulated.

Snowfall

April through November are months without snowfall in Dover.

Daylight

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

Sunshine

In September, the average sunshine is 9.2h.

UV index

In Dover, Delaware, the average daily maximum UV index is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to the UV radiation for ordinary individuals.
Note: In September, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 temperature in September in Dover?

The average high-temperature, in September, in Dover, Delaware, is 76.3°F (24.6°C), while the average low-temperature is 63°F (17.2°C).

What is the average humidity in September in Dover?

In Dover, the average relative humidity in September 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?

In Dover snow does not fall in April through November.

How many hours of daylight does Dover have in September?

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

How many hours of sunshine does Dover have in September?

In Dover, the average sunshine in September is 9.2h.

What is the UV index reading in September in Dover?

In Dover, the average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.

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"

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

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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%).
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").
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).
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: 12.4h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 9.2h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 5h).

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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

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).

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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

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).

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