August weather forecast and climate
New Castle, DE

Weather in August

August, the last month of the summer, in New Castle, is also a moderately hot month, with average temperature varying between 66.9°F (19.4°C) and 82.9°F (28.3°C).

Temperature

In New Castle, the average high-temperature is essentially the same as in July - a still moderately hot 82.9°F (28.3°C). The average low-temperature,, is 66.9°F (19.4°C).

Heat index

The average heat index in August is estimated at a hot 89.6°F (32°C). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Note that heat index values are valued for light wind and location in the shade. With exposure to direct sunlight, the heat index may be increased by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like', 'apparent temperature', 'felt air temperature', or 'real feel', is what the temperature feels like to the human body when the air temperature is combined with the relative humidity. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (wind, clothing, differences in body mass, height, and shape). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.

Humidity

In August, the average relative humidity in New Castle is 75%.

Rainfall

The month with the most rainfall is August when the rain falls for 14.7 days and typically aggregates up to 2.83" (72mm) of precipitation.

Snowfall

May through October are months without snowfall in New Castle.

Ocean temperature

With an average ocean temperature of 76.3°F (24.6°C), August is the month with the warmest seawater.
Note: A person's cold intolerance, with sunshine, wind, and air temperature, are essential factors for enjoying swimming in 76.3°F (24.6°C) water. (FYI: The Olympic swimming competition requires a water temperature between 77°F (25°C) and 82.4°F (28°C).)

Daylight

The average length of the day in August is 13.7h.

Sunshine

In New Castle, the average sunshine in August is 10.3h.

UV index

Months with the highest UV index in New Castle are May through August, with an average maximum UV index of 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV radiation for ordinary individuals.
Note: The average daily UV index of 6 transform into the following instructions:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. 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. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the temperature in August in New Castle?

The average high-temperature, in August, in New Castle, Delaware, is 82.9°F (28.3°C), while the average low-temperature is 66.9°F (19.4°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which represents the influence of relative humidity on air temperature, in August is estimated at 89.6°F (32°C).

What is the average humidity in August in New Castle?

In August, the average relative humidity in New Castle is 75%.

What is the wettest month in New Castle?

August is the month with the most rainfall. Rain falls for 14.7 days and accumulates 2.83" (72mm) of precipitation.

How many days does it rain in August in New Castle?

In New Castle, Delaware, during August, the rain falls for 14.7 days and regularly aggregates up to 2.83" (72mm) of precipitation.

When it does not snow in New Castle?

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

When is the ocean warmest in New Castle?

With an average ocean temperature of 76.3°F (24.6°C), August is the month with the warmest seawater in New Castle.

What is the ocean temperature in August in New Castle?

In August, the average ocean temperature in New Castle, Delaware, is 76.3°F (24.6°C). For individuals prone to feeling cold, swimming in 73.4°F (23°C) is still regarded as intolerable. A wetsuit is not a necessity, but sunshine, wind, and air temperature are essential factors for relishing swimming at 76.3°F (24.6°C).

What is the average length of the day in August in New Castle?

The average length of the day in August is 13.7h.

How long on average sun shines in August in New Castle?

The average sunshine in August in New Castle, Delaware, is 10.3h.

When is the highest UV index in New Castle?

May through August, with an average maximum UV index of 6, are months with the highest UV index in New Castle, Delaware.

What is the UV index intensity in August in New Castle?

In August, the average daily maximum UV index is 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV rays.

Average temperature in August
New Castle, DE

Average temperature in August - New Castle, DE
  • Average high temperature in August: 82.9°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 August: 66.9°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).

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Average pressure in August
New Castle, DE

Average pressure in August - New Castle, DE
  • Average pressure in August: 29.99"

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

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Average wind speed in August
New Castle, DE

Average wind speed in August - New Castle, DE
  • Average wind speed in August: 5.4mph

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).

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Average humidity in August
New Castle, DE

Average humidity in August - New Castle, DE
  • Average humidity in August: 75%

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

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Average rainfall in August
New Castle, DE

Average rainfall in August - New Castle, DE
  • Average rainfall in August: 2.83"

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

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Average rainfall days in August
New Castle, DE

Average rainfall days in August - New Castle, DE
  • Average rainfall days in August: 14.7 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).

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Average snowfall in August
New Castle, DE

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

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

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Average snowfall days in August
New Castle, DE

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

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

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Average sea temperature in August
New Castle, DE

Average sea temperature in August - New Castle, DE
  • Average sea temperature in August: 76.3°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).

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

Average daylight in August / Average sunshine in August - New Castle, DE
  • Average daylight in August: 13.7h

The month with the longest days is June (Average daylight: 14.9h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in August: 10.3h

The month with the most sunshine is July (Average sunshine: 10.8h).
The month with the least sunshine is February (Average sunshine: 4.9h).

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Average sunshine days in August
New Castle, DE

Average sunshine days in August - New Castle, DE
  • Average sunshine days in August: 14.2 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).

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Average UV index in August
New Castle, DE

Average UV index in August - New Castle, DE
  • Average UV index in August: 6

Months with the highest UV index are May, June, July and August (UV index 6).
Months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in August
New Castle, DE

Average cloud cover in August - New Castle, DE
  • Average cloud cover in August: 32

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).

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Average visibility in August
New Castle, DE

Average visibility in August - New Castle, DE
  • Average visibility in August: 6mi

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

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