Dover
Delaware, USA
Long-term weather forecast
Long-term weather forecast

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
September, the first month of the autumn, in Dover, is still a warm month, with temperature in the range of an average low of 57.2°F (14°C) and an average high of 80.6°F (27°C).

Temperature

In September, the average high-temperature marginally drops, from a tropical 86°F (30°C) in August, to a moderately hot 80.6°F (27°C). In Dover, the average low-temperature is 57.2°F (14°C).

Rainfall

In Dover, Delaware, during September, the rain falls for 8 days and regularly aggregates up to 4" (102mm) of precipitation. In Dover, during the entire year, the rain falls for 115 days and collects up to 43.5" (1105mm) of precipitation.

Daylight

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

Sunshine

In September, the average sunshine is 8h.

UV index

In Dover, the average daily maximum UV index in September is 7. A UV Index value of 6 to 7 symbolizes a high health hazard from the exposure to the Sun's UV radiation for the average person.
Note: The average daily UV index of 7 in September transform into the following instructions:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. 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 Dover?

In Dover, in September, the average high-temperature is 80.6°F (27°C), and the average low-temperature is 57.2°F (14°C).

How many days does it rain in September in Dover?

In September, in Dover, Delaware, the rain falls for 8 days. Throughout September, 4" (102mm) of precipitation is accumulated.

How many hours of daylight does Dover have in September?

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

How many hours of sunshine does Dover have in September?

In Dover, Delaware, the average sunshine in September is 8h.

How high is the UV index in September in Dover?

The average daily maximum UV index in September in Dover is 7. A UV Index of 6 to 7 symbolizes a high hazard to health from unsafe exposure to the Sun's UV rays.
Average temperature in September - Dover, DE
  • Average high temperature in September: 81°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (41°F).

  • Average low temperature in September: 57°F

The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average rainfall in September - Dover, DE
  • Average rainfall in September: 4"

The wettest month (with the highest rainfall) is August (4.3").
The driest month (with the lowest rainfall) is February (3").

Average rainfall days in September - Dover, DE
  • Average rainfall days in September: 8 days

The month with the highest number of rainy days is July (11 days).
The month with the lowest number of rainy days is October (7 days).

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 shortest days is December (Average daylight: 9.5h).

  • Average sunshine in September: 8h

Months with most sunshine are June and July (Average sunshine: 9h).
Months with least sunshine are January and December (Average sunshine: 5).

Average UV index in September - Dover, DE
  • Average UV index in September: 7

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January, November and December (UV index 2).