September weather forecast
New Castle, VA

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Weather in September

September, the first month of the autumn in New Castle, is also a moderately hot month, with temperature in the range of an average high of 77.7°F (25.4°C) and an average low of 56.1°F (13.4°C).

Temperature

September witnesses a gentle descent in average high-temperature, descending from August's 84.4°F (29.1°C) to a still moderately hot 77.7°F (25.4°C). In the month of September, the average low-temperature usually rests at a moderate 56.1°F (13.4°C).

Humidity

The months with the highest humidity are May, September and December, with an average relative humidity of 77%.

Rainfall

September is the month with the least rainfall in New Castle. Rain falls for 12.9 days and accumulates 1.61" (41mm) of precipitation.

Snowfall

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

Daylight

The average length of the day in September is 12h and 25min.
On the first day of September, sunrise is at 6:51 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:04 pm EDT.

Sunshine

The average sunshine in September is 8.3h.

UV index

The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.
Note: In September, the maximum UV index of 5 translates into these guidelines:
Take care. Persons with lighter skin might suffer burns in less than 30 minutes. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Updated: Aug 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average September temperature?

In September, in New Castle, the average high-temperature is 77.7°F (25.4°C), and the average low-temperature is 56.1°F (13.4°C). In August, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which combines air temperature and relative humidity, is computed to be 93.2°F (34°C).

What is the most humid month?

The months with the highest humidity are May, September and December, with an average relative humidity of 77%.

What is the average humidity in September?

In September, the average relative humidity is 77%.

What is the driest month?

September is the month with the least rainfall. Rain falls for 12.9 days and accumulates 1.61" (41mm) of precipitation.

How many days does it rain in September?

In New Castle, during September, the rain falls for 12.9 days and regularly aggregates up to 1.61" (41mm) of precipitation.

When it does not snow?

May through September are months without snowfall.

Does it snow in September?

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

What is the average length of the day in September?

In September, the average day length in New Castle, Virginia, is 12h and 25min.

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

In September, on the first day of the month, sunrise is at 6:51 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 7:04 pm EDT.

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

The average sunshine duration in September is 8.3h.

What is the UV index intensity in September?

In New Castle, the average daily maximum UV index in September is 5. A UV Index value of 3 to 5 symbolizes a moderate vulnerability from 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, VA

Average temperature in September - New Castle, VA
  • Average high temperature in September: 77.7°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (41.2°F).

  • Average low temperature in September: 56.1°F

The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average pressure in September
New Castle, VA

Average pressure in September - New Castle, VA
  • Average pressure in September: 30.06"Hg

The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.98"Hg).

Average wind speed in September
New Castle, VA

Average wind speed in September - New Castle, VA
  • Average wind speed in September: 4.2mph

The windiest month (with the highest average wind speed) is February (6.8mph).
The calmest month (with the lowest average wind speed) is August (3.9mph).

Average humidity in September
New Castle, VA

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

The months with the highest relative humidity are May, September and December (77%).
The month with the lowest relative humidity is July (72%).

Average rainfall in September
New Castle, VA

Average rainfall in September - New Castle, VA
  • Average rainfall in September: 1.61"

The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is September (1.61").

Average rainfall days in September
New Castle, VA

Average rainfall days in September - New Castle, VA
  • Average rainfall days in September: 12.9 days

The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (7.6 days).

Average snowfall in September
New Castle, VA

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

The month with the highest snowfall is March (2.76").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in September
New Castle, VA

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

The month with the highest number of snowfall days is February (3.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - New Castle, VA
  • Average daylight in September: 12h and 2min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in September: 8h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 5h and 24min).

Average sunshine days in September
New Castle, VA

Average sunshine days in September - New Castle, VA
  • Average sunshine days in September: 15.7 days

The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is May (11.6 days).

Average UV index in September
New Castle, VA

Average UV index in September - New Castle, VA
  • 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, VA

Average cloud cover in September - New Castle, VA
  • Average cloud cover in September: 39

The month with the most cloud cover is February (Cloud cover 45).
The months with the least cloud cover are June and July (Cloud cover 31).

Average visibility in September
New Castle, VA

Average visibility in September - New Castle, VA
  • Average visibility in September: 5mi

The months with the highest visibility are June, July and November (6mi).
The months with the lowest visibility are January, February, March, April, May, August, September, October and December (5mi).

New Castle, Virginia, USA

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