September weather forecast
Frederica, DE

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Weather in September

September ushers in the autumn season to Frederica, Delaware, painting the landscape with an array of warm hues. In terms of temperature, September differs a fair amount from the preceding months, with temperatures descending to a comfortable 76.5°F (24.7°C). It's a month where nature embarks on an artistic venture, chargrilled summer leaves turning into a vibrant palette of oranges, reds, and yellows. The significant cutback in daylight hours further testifies to the seasonal shift. The increasingly crisp nights herald the departure of summer and the arrival of fall.

Temperature

September in Frederica brings a slight decrease in temperature, down from a moderately hot 82.2°F (27.9°C) in August to a still warm 76.5°F (24.7°C). Frederica reports a consistent average low-temperature of 63.1°F (17.3°C) throughout September nights.

Humidity

The months with the highest humidity are May, August and September, with an average relative humidity of 79%.

Rainfall

In Frederica, in September, during 13.6 rainfall days, 2.44" (62mm) of precipitation is typically accumulated. In Frederica, during the entire year, the rain falls for 167.5 days and collects up to 35.35" (898mm) of precipitation.

Snowfall

In Frederica, Delaware, snow does not fall in May through October.

Daylight

The average length of the day in September in Frederica is 12h and 26min.
On the first day of the month, sunrise is at 6:31 am and sunset at 7:31 pm. On the last day of September, sunrise is at 6:57 am and sunset at 6:45 pm EDT.

Sunshine

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

UV index

In Frederica, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the average person.
Note: The daily maximum UV index of 5 in September interprets into the following advice:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. 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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Frequently asked questions

What is the temperature in September in Frederica?

The high-temperature, in September, in Frederica, records 76.5°F (24.7°C), while the low-temperature is 63.1°F (17.3°C). In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, is estimated at 89.6°F (32°C).

What is the most humid month in Frederica?

May, August and September, with an average relative humidity of 79%, are most humid months in Frederica, Delaware.

What is the average humidity in September in Frederica?

The average relative humidity in September in Frederica is 79%.

How many days does it rain in September in Frederica?

In Frederica, in September, during 13.6 rainfall days, 2.44" (62mm) of precipitation is typically accumulated.

When it does not snow in Frederica?

May through October are months without snowfall in Frederica.

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

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

What time are sunrise and sunset in September in Frederica?

On the first day of September, sunrise is at 6:31 am and sunset at 7:31 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:45 pm EDT.

How long on average sun shines in September in Frederica?

In Frederica, Delaware, the average sunshine duration in September is 9.2h.

How high is the UV index in September in Frederica?

In September, the average daily maximum UV index in Frederica, Delaware, is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJFMAMJJASeptemberOND
Aug
September
Oct
Average high temperature
82.2°F 27.9°C
76.5°F 24.7°C
65.8°F 18.8°C
Average low temperature
68.2°F 20.1°C
63.1°F 17.3°C
53.6°F 12°C
Average pressure
29.98" 761mmHg
30.04" 763mmHg
30.03" 763mmHg
Average wind speed
6.3mph 10.1km/h
7.3mph 11.7km/h
8.6mph 13.8km/h
Average max. wind speed
6.8mph 10.9km/h
7.5mph 12.1km/h
9.4mph 15.1km/h
Average wind speed gusts
10.4mph 16.7km/h
11.8mph 19km/h
14.2mph 22.9km/h
Average humidity
79%
79%
77%
Average rainfall
3.9" 99mm
2.44" 62mm
3.07" 78mm
Average rainfall days
16.9
13.6
12.5
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average daylight
13h 4min
12h 2min
11h 1min
Average sunshine
10h 2min
9h 1min
5h 4min
Average sunshine days
12
13.9
16.1
Average UV index
6
5
4
Average cloud cover
31%
34%
39%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in September
Frederica, DE

Average temperature in September - Frederica, DE
  • Average high temperature in September: 76.5°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 (40.3°F).

  • Average low temperature in September: 63.1°F

The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (28.8°F).

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Average pressure in September
Frederica, DE

Average pressure in September - Frederica, 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
Frederica, DE

Average wind speed in September - Frederica, 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 (6.3mph).

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Average humidity in September
Frederica, DE

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

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

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Average rainfall in September
Frederica, DE

Average rainfall in September - Frederica, DE
  • Average rainfall in September: 2.44"

The wettest month (with the highest rainfall) is August (3.9").
The driest month (with the least rainfall) is January (2.13").

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Average rainfall days in September
Frederica, DE

Average rainfall days in September - Frederica, DE
  • Average rainfall days in September: 13.6 days

The month with the highest number of rainy days is July (18.8 days).
The month with the least rainy days is November (9 days).

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Average snowfall in September
Frederica, DE

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

The month with the highest snowfall is January (1.93").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in September
Frederica, DE

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

The month with the highest number of snowfall days is January (4.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

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

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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Average sunshine days in September
Frederica, DE

Average sunshine days in September - Frederica, DE
  • Average sunshine days in September: 13.9 days

The month with the most sunshine days is November (19.4 days).
The month with the least sunshine days is July (9.7 days).

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Average UV index in September
Frederica, DE

Average UV index in September - Frederica, 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
Frederica, DE

Average cloud cover in September - Frederica, DE
  • Average cloud cover in September: 34

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in September
Frederica, DE

Average visibility in September - Frederica, 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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Frederica, Delaware, USA

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