September weather forecast
New Castle, DE

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Weather in September

September in New Castle signifies the onset of fall, with a noticeable drop in temperatures. This month witnesses the lowest rainfall of the second half of the year at 1.42" (36mm). The weather changes dramatically with a decrease in daylight hours. As the summer's heat recedes, the afternoon breezes return, creating a pleasing contrast. The decrease in sea temperature signals the end of beach season.

Temperature

New Castle in September undergoes a slight reduction in the average high-temperature, shifting from August's moderately hot 82.9°F (28.3°C) to a still warm 76.3°F (24.6°C). The month of September records an average low-temperature of 60.6°F (15.9°C).

Humidity

In September, the average relative humidity is 77%.

Rainfall

In September, the rain falls for 11.2 days. Throughout September, 1.42" (36mm) of precipitation is accumulated. In New Castle, during the entire year, the rain falls for 143.2 days and collects up to 21.89" (556mm) of precipitation.

Snowfall

May through October are months without snowfall.

Ocean temperature

In September, the average ocean temperature is 72.1°F (22.3°C).
Note: The allure of a swim in 72.1°F (22.3°C) waters can be influenced by your feelings towards the cold, today's sunshine, the wind's touch, and the ambient warmth. To put it in perspective, Olympic standards demand water temperatures of 77°F (25°C) to 82.4°F (28°C).

Daylight

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 7:32 pm. On the last day of September, sunrise is at 6:58 am and sunset at 6:45 pm EDT.

Sunshine

The average sunshine in September is 9.2h.

UV index

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.
Note: In September, a regular UV index of 5 translates into these guidelines:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Opt for tightly woven and loose clothing to enhance protection from the Sun. Take caution! The UV rays from the Sun gain strength from sand and water reflections.

Frequently asked questions

What is the temperature in September?

The high-temperature, in September, in New Castle, is 76.3°F (24.6°C), while the low-temperature averages to 60.6°F (15.9°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines air temperature and relative humidity, in August is evaluated at 89.6°F (32°C).

What is the average humidity in September?

In September, the average relative humidity is 77%.

How much does it rain in September?

In New Castle, in September, during 11.2 rainfall days, 1.42" (36mm) of precipitation is typically accumulated.

When it does not snow?

In New Castle, snow does not fall in May through October.

How warm is the water in September?

In New Castle, the average seawater temperature in September is 72.1°F (22.3°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 72.1°F (22.3°C) water may be enjoyable.

What is the average length of the day in September?

The average day length in September is 12h and 26min.

What time are sunrise and sunset in September in New Castle?

On the first day of September, sunrise is at 6:31 am and sunset at 7:32 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:45 pm EDT.

How many hours of sunshine does New Castle have in September?

The average sunshine duration in September is 9.2h.

What is the UV index intensity in September?

The average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from unsafe exposure to Sun's UV rays.
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
New Castle, DE

Average temperature in September - New Castle, DE
  • Average high temperature in September: 76.3°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in September: 60.6°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average pressure in September
New Castle, DE

Average pressure in September - New Castle, DE
  • Average pressure in September: 30.05"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in September
New Castle, DE

Average wind speed in September - New Castle, DE
  • Average wind speed in September: 6mph

The windiest months (with the highest average wind speed) are February and March (8.8mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

Average humidity in September
New Castle, DE

Average humidity in September - New Castle, DE
  • Average humidity in September: 77%

The month with the highest relative humidity is October (78%).
The month with the lowest relative humidity is April (72%).

Average rainfall in September
New Castle, DE

Average rainfall in September - New Castle, DE
  • Average rainfall in September: 1.42"

The wettest month (with the highest rainfall) is August (2.83").
The driest month (with the least rainfall) is January (1.38").

Average rainfall days in September
New Castle, DE

Average rainfall days in September - New Castle, DE
  • Average rainfall days in September: 11.2 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in September
New Castle, DE

Average snowfall in September - New Castle, DE
  • Average snowfall in September: 0"

The month with the highest snowfall is January (1.69").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in September
New Castle, DE

Average snowfall days in September - New Castle, DE
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is January (5.2 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in September
New Castle, DE

Average sea temperature in September - New Castle, DE
  • Average sea temperature in September: 72.1°F

The best month for swimming (with the highest average sea temperature) is August (76.3°F).
The coldest month (with the lowest average sea temperature) is February (40.9°F).

Average daylight in September /
Average sunshine in September
New Castle, DE

Average daylight in September / Average sunshine in September - New Castle, 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 24min).

  • Average sunshine in September: 9h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

Average sunshine days in September
New Castle, DE

Average sunshine days in September - New Castle, DE
  • Average sunshine days in September: 17.6 days

The month with the most sunshine days is November (20.1 days).
The month with the least sunshine days is May (11.8 days).

Average UV index in September
New Castle, DE

Average UV index in September - New Castle, 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, February, November and December (UV index 2).

Average cloud cover in September
New Castle, DE

Average cloud cover in September - New Castle, DE
  • Average cloud cover in September: 35

The months with the most cloud cover are February and March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in September
New Castle, DE

Average visibility in September - New Castle, 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).

New Castle, Delaware, USA

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