September weather forecast
Frankford, DE

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Weather in September

September brings the onset of fall with a discernible change in weather conditions in Frankford. The average temperature goes down gradually in response to the coming fall, with high temperatures averaging at 75.9°F (24.4°C). A significant drop in daylight hours ensues, leading to cooler and shorter days. As summer winds down, the windy conditions also begin to pick up pace. The lower cloud cover also signifies the changing season, allowing for clearer skies.

Temperature

Frankford starts September with an average high-temperature of a still warm 75.9°F (24.4°C), hinting at a minimal fluctuation from August. Frankford's temperature lowers to a mean of 65.7°F (18.7°C) during the nights in September.

Humidity

In September, the average relative humidity is 79%.

Rainfall

In Frankford, in September, during 13.5 rainfall days, 1.73" (44mm) of precipitation is typically accumulated. Throughout the year, there are 146.8 rainfall days, and 25.2" (640mm) of precipitation is accumulated.

Snowfall

In Frankford, snow does not fall in April through October.

Daylight

The average length of the day in September is 12h and 25min.
On the first day of September, sunrise is at 6:30 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:44 pm EDT.

Sunshine

In September, the average sunshine is 9.4h.

UV index

The average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The average daily UV index of 5 in September transforms into the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation.

Frequently asked questions

What are September temperatures?

An average high-temperature, in September, in Frankford, is 75.9°F (24.4°C) and the average low-temperature is 65.7°F (18.7°C). The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, in August is appraised at 86°F (30°C).

What is the average humidity in September?

In Frankford, the average relative humidity in September is 79%.

How much does it rain in September?

In Frankford, Delaware, in September, during 13.5 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow?

April through October are months without snowfall.

How many hours of daylight does Frankford have in September?

In Frankford, the average day length in September is 12h and 25min.

What time are sunrise and sunset in September?

In September, on the first day of the month, sunrise is at 6:30 am and sunset at 7:30 pm. On the last day of the month, sunrise is at 6:56 am and sunset at 6:44 pm EDT.

How many hours of sunshine does Frankford have in September?

In Frankford, the average sunshine duration in September is 9.4h.

What is the UV index reading in September?

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 the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in September
Frankford, DE

Average temperature in September - Frankford, DE
  • Average high temperature in September: 75.9°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (41.7°F).

  • Average low temperature in September: 65.7°F

The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (31.5°F).

Average pressure in September
Frankford, DE

Average pressure in September - Frankford, 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).

Average wind speed in September
Frankford, DE

Average wind speed in September - Frankford, DE
  • Average wind speed in September: 8.8mph

The windiest months (with the highest average wind speed) are January, February and March (11.1mph).
The calmest month (with the lowest average wind speed) is August (7.3mph).

Average humidity in September
Frankford, DE

Average humidity in September - Frankford, DE
  • Average humidity in September: 79%

The month with the highest relative humidity is May (81%).
The months with the lowest relative humidity are January and November (74%).

Average rainfall in September
Frankford, DE

Average rainfall in September - Frankford, DE
  • Average rainfall in September: 1.73"

The wettest months (with the highest rainfall) are July and August (2.95").
The driest month (with the least rainfall) is January (1.46").

Average rainfall days in September
Frankford, DE

Average rainfall days in September - Frankford, DE
  • Average rainfall days in September: 13.5 days

The month with the highest number of rainy days is July (16.7 days).
The month with the least rainy days is January (7.4 days).

Average snowfall in September
Frankford, DE

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

The month with the highest snowfall is January (1.22").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in September
Frankford, DE

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

The month with the highest number of snowfall days is January (3.1 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Frankford, DE
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 2min

The month with the most sunshine is July (Average sunshine: 11h and 0min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).

Average sunshine days in September
Frankford, DE

Average sunshine days in September - Frankford, DE
  • Average sunshine days in September: 14.3 days

The month with the most sunshine days is January (20.1 days).
The month with the least sunshine days is July (12.2 days).

Average UV index in September
Frankford, DE

Average UV index in September - Frankford, 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).

Average cloud cover in September
Frankford, DE

Average cloud cover in September - Frankford, DE
  • Average cloud cover in September: 31

The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 26).

Average visibility in September
Frankford, DE

Average visibility in September - Frankford, 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).

Frankford, Delaware, USA

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