September weather forecast
Milford, DE

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Weather in September

September marks a gradual transition from warm temperatures toward cooler weather. The rainfall eases off, dropping to 1.85" (47mm). Sunshine hours remain high, although daylight begins to shorten. Winds pick up slightly, indicating the onset of autumn. The change in temperatures and atmospheric conditions makes September an inviting month in Milford.

Temperature

September in Milford is characterized by a mild reduction in the average high-temperature, from 81.5°F (27.5°C) in August to a still moderately hot 76.1°F (24.5°C). During the nights in September, Milford experiences a consistent average temperature of 64°F (17.8°C).

Humidity

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

Rainfall

In Milford, in September, during 13.5 rainfall days, 1.85" (47mm) of precipitation is typically accumulated. Throughout the year, there are 152.4 rainfall days, and 25.94" (659mm) of precipitation is accumulated.

Snowfall

April, June through October are months without snowfall.

Daylight

In Milford, the average length of the day in September 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 Milford, Delaware, the average sunshine in September is 9.4h.

UV index

The average daily maximum UV index in September is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for the average person.
Note: The daily high UV index of 5 in September translates into this advice:
Exercise prevention - Warding off sunburn is urged. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Updated: Feb 10, 2024 | Published by: Weather Atlas | Resources

Frequently asked questions

What are the temperatures in Milford in September?

The average high-temperature and low-temperature in Milford, Delaware, during September are 76.1°F (24.5°C) and 64°F (17.8°C) respectively. In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines air temperature and relative humidity, is calculated to be 87.8°F (31°C).

What is the average humidity in September in Milford?

In September, the average relative humidity is 79%.

How many days does it rain in September in Milford?

In September, in Milford, Delaware, the rain falls for 13.5 days. Throughout September, 1.85" (47mm) of precipitation is accumulated.

When it does not snow in Milford?

April, June through October are months without snowfall in Milford, Delaware.

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

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

When are sunrise and sunset in September in Milford?

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

How many hours of sunshine does Milford have in September?

The average sunshine duration in September in Milford is 9.4h.

How high is the UV index in September in Milford?

In Milford, Delaware, the average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health threat from unprotected exposure to 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
Milford, DE

Average temperature in September - Milford, DE
  • Average high temperature in September: 76.1°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (40.6°F).

  • Average low temperature in September: 64°F

The month with the highest average low temperature is July (70.7°F).
The coldest month (with the lowest average low temperature) is January (29.7°F).

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Average pressure in September
Milford, DE

Average pressure in September - Milford, 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
Milford, DE

Average wind speed in September - Milford, DE
  • Average wind speed in September: 7.8mph

The windiest month (with the highest average wind speed) is February (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

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Average humidity in September
Milford, DE

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

The month with the highest relative humidity is May (80%).
The months with the lowest relative humidity are January and November (74%).

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Average rainfall in September
Milford, DE

Average rainfall in September - Milford, DE
  • Average rainfall in September: 1.85"

The wettest month (with the highest rainfall) is August (3.07").
The driest month (with the least rainfall) is January (1.5").

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Average rainfall days in September
Milford, DE

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

The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is January (8.4 days).

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Average snowfall in September
Milford, DE

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

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

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Average snowfall days in September
Milford, DE

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

The month with the highest number of snowfall days is January (3.3 days).
The months with the least snowfall days are April, June, July, August, September and October (0 days).

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

Average daylight in September / Average sunshine in September - Milford, 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 2min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 0min).

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Average sunshine days in September
Milford, DE

Average sunshine days in September - Milford, DE
  • Average sunshine days in September: 14.7 days

The month with the most sunshine days is January (19.6 days).
The month with the least sunshine days is July (11.6 days).

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Average UV index in September
Milford, DE

Average UV index in September - Milford, 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
Milford, DE

Average cloud cover in September - Milford, DE
  • Average cloud cover in September: 32

The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 27).

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Average visibility in September
Milford, DE

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

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