September weather forecast and climate
Dover, NJ

September, the first month of the autumn, in Dover, is also a moderately hot month, with average temperature ranging between min 55.6°F (13.1°C) and max 73.9°F (23.3°C).

Temperature

In Dover, the average high-temperature marginally drops, from 81.1°F (27.3°C) in August, to a still warm 73.9°F (23.3°C). In Dover, the average low-temperature is 55.6°F (13.1°C).

Humidity

In September, the average relative humidity in Dover, New Jersey, is 79%.

Rainfall

The month with the least rainfall in Dover, New Jersey, is September when the rain falls for 6.3 days and typically collects 0.16" (4mm) of precipitation.

Snowfall

June through September are months without snowfall in Dover.

Daylight

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

Sunshine

The average sunshine in September is 8.4h.

UV index

The average daily maximum UV index in September is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The daily maximum UV index of 4 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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, New Jersey, in September, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 55.6°F (13.1°C).

What is the average humidity in September in Dover?

In September, the average relative humidity in Dover, New Jersey, is 79%.

How much does it rain in Dover in September?

In Dover, in September, during 6.3 rainfall days, 0.16" (4mm) of precipitation is typically accumulated.

What is the driest month in Dover?

The month with the least rainfall is September when the rain falls for 6.3 days and typically collects 0.16" (4mm) of precipitation.

Does it snow in Dover in September?

In Dover, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Dover?

June through September are months without snowfall in Dover, New Jersey.

What is the average length of the day in September in Dover?

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

How many hours of sunshine does Dover have in September?

In Dover, the average sunshine in September is 8.4h.

What is the UV index intensity in September in Dover?

The average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from the exposure to the Sun's UV radiation.
Average temperature in September - Dover, NJ
  • Average high temperature in September: 23.3°C

The warmest month (with the highest average high temperature) is July (28.3°C).
The month with the lowest average high temperature is January (1.3°C).

  • Average low temperature in September: 13.1°C

The month with the highest average low temperature is July (17.8°C).
The coldest month (with the lowest average low temperature) is January (-6.2°C).

Average pressure in September - Dover, NJ
  • Average pressure in September: 1017.8mbar

The month with the highest atmospheric pressure is November (1019.6mbar).
The month with the lowest atmospheric pressure is June (1013.7mbar).

Average wind speed in September - Dover, NJ
  • Average wind speed in September: 8.9km/h

The windiest month (with the highest average wind speed) is March (13.2km/h).
The calmest month (with the lowest average wind speed) is August (8.2km/h).

Average humidity in September - Dover, NJ
  • Average humidity in September: 79%

Months with the highest relative humidity are February, October and December (81%).
The month with the lowest relative humidity is April (75%).

Average rainfall in September - Dover, NJ
  • Average rainfall in September: 4mm

The wettest month (with the highest rainfall) is July (20mm).
The driest month (with the least rainfall) is September (4mm).

Average rainfall days in September - Dover, NJ
  • Average rainfall days in September: 6.3 days

The month with the highest number of rainy days is July (9.5 days).
The month with the least rainy days is February (4 days).

Average snowfall in September - Dover, NJ
  • Average snowfall in September: 0mm

The month with the highest snowfall is March (20mm).
Months with the least snowfall are June, July, August and September (0mm).

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

The month with the highest number of snowfall days is February (5.3 days).
Months with the least snowfall days are June, July, August and September (0 days).

Average daylight in September / Average sunshine in September - Dover, NJ
  • Average daylight in September: 12.4h

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

  • Average sunshine in September: 8.4h

The month with the most sunshine is July (Average sunshine: 10.2h).
The month with the least sunshine is February (Average sunshine: 4.4h).

Average sunshine days in September - Dover, NJ
  • Average sunshine days in September: 21.8 days

The month with the most sunshine days is November (24.5 days).
The month with the least sunshine days is July (18.3 days).

Average UV index in September - Dover, NJ
  • Average UV index in September: 4

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

Average cloud cover in September - Dover, NJ
  • Average cloud cover in September: 42

Months with the most cloud cover are February and March (Cloud cover 51).
Months with the least cloud cover are July and August (Cloud cover 36).

Average visibility in September - Dover, NJ
  • Average visibility in September: 8km

Months with the highest visibility are January, March, April, November and December (9km).
Months with the lowest visibility are February, May, June, July, August, September and October (8km).