July weather forecast and climate
New Castle, DE

Weather in July

July, the same as June, is a moderately hot summer month in New Castle, Delaware, with average temperature ranging between min 68.5°F (20.3°C) and max 84.9°F (29.4°C).

Temperature

With an average high-temperature of 84.9°F (29.4°C) and an average low-temperature of 68.5°F (20.3°C), July is the warmest month.

Heat index

The average heat index is estimated at a hot 94.5°F (34.7°C). Take extra precautions, as heat cramps and heat exhaustion are possible. Sustained activity may result in heatstroke.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'apparent temperature', 'real feel', or 'feels like', is an index that combines air temperature and relative humidity to determine the human-perceived temperature equivalent. This effect is individual, with diverse people perceiving weather differently for numerous reasons (metabolic differences, pregnancy, clothing), and activity. Bear in mind that direct sunshine exposure increases weather impact, and may raise heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. 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 July, the average relative humidity is 75%.

Rainfall

In New Castle, during July, the rain falls for 16.2 days and regularly aggregates up to 2.4" (61mm) of precipitation. In New Castle, during the entire year, the rain falls for 143.2 days and collects up to 21.89" (556mm) of precipitation.

Snowfall

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

Ocean temperature

In New Castle, the average seawater temperature in July is 74.3°F (23.5°C).
Note: Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 74.3°F (23.5°C) water may be enjoyable. (FYI: The official water temperature required for the Olympic swimming competition is 77°F (25°C) to 82.4°F (28°C).)

Daylight

In New Castle, Delaware, the average length of the day in July is 14.6h.

Sunshine

The month with the most sunshine in New Castle is July, with an average of 10.8h of sunshine.

UV index

May through August, with an average maximum UV index of 6, are months with the highest UV index in New Castle, Delaware. A UV Index value of 6 to 7 symbolizes a high health risk from the exposure to the Sun's UV rays for the ordinary person.
Note: In July, the average maximum UV index of 6 translate into the following recommendations:
Take precautions and utilize sun safety practices. Protection against the skin and eye damage is required. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.
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FAQ

What is the warmest month in New Castle?

With an average high-temperature of 84.9°F (29.4°C) and an average low-temperature of 68.5°F (20.3°C), July is the warmest month.

What is the temperature in July in New Castle?

In July, the average high-temperature is 84.9°F (29.4°C), and the average low-temperature is 68.5°F (20.3°C). The average heat index (a.k.a. 'feels like', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in July is estimated at 94.5°F (34.7°C).

What is the average humidity in July in New Castle?

The average relative humidity in July is 75%.

How much does it rain in New Castle in July?

In New Castle, in July, during 16.2 rainfall days, 2.4" (61mm) of precipitation is typically accumulated.

When it does not snow in New Castle?

May through October are months without snowfall in New Castle, Delaware.

What is the water temperature in July in New Castle?

In New Castle, the average seawater temperature in July is 74.3°F (23.5°C). Depending on a person's sensitivity to cold, with regards to sunshine, wind, and air temperature, a quick swim in 74.3°F (23.5°C) water may be enjoyable.

How many hours of daylight does New Castle have in July?

In New Castle, the average length of the day in July is 14.6h.

What month has the most sunshine in New Castle?

July has the most sunshine of the year in New Castle, Delaware, with an average of 10.8h of sunshine.

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

In New Castle, the average sunshine in July is 10.8h.

What are the months with 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 reading in July in New Castle?

In New Castle, Delaware, the average daily maximum UV index in July is 6. A UV Index reading of 6 to 7 represents a high health threat from the exposure to the Sun's UV rays.

Average temperature in July
New Castle, DE

Average temperature in July - New Castle, DE
  • Average high temperature in July: 84.9°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 July: 68.5°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 July
New Castle, DE

Average pressure in July - New Castle, DE
  • Average pressure in July: 29.96"

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 July
New Castle, DE

Average wind speed in July - New Castle, DE
  • Average wind speed in July: 5.5mph

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 July
New Castle, DE

Average humidity in July - New Castle, DE
  • Average humidity in July: 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 July
New Castle, DE

Average rainfall in July - New Castle, DE
  • Average rainfall in July: 2.4"

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 July
New Castle, DE

Average rainfall days in July - New Castle, DE
  • Average rainfall days in July: 16.2 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).

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Average snowfall in July
New Castle, DE

Average snowfall in July - New Castle, DE
  • Average snowfall in July: 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 July
New Castle, DE

Average snowfall days in July - New Castle, DE
  • Average snowfall days in July: 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 July
New Castle, DE

Average sea temperature in July - New Castle, DE
  • Average sea temperature in July: 74.4°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 July /
Average sunshine in July
New Castle, DE

Average daylight in July / Average sunshine in July - New Castle, DE
  • Average daylight in July: 14.6h

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 July: 10.8h

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 July
New Castle, DE

Average sunshine days in July - New Castle, DE
  • Average sunshine days in July: 12.3 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 July
New Castle, DE

Average UV index in July - New Castle, DE
  • Average UV index in July: 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 July
New Castle, DE

Average cloud cover in July - New Castle, DE
  • Average cloud cover in July: 30

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 July
New Castle, DE

Average visibility in July - New Castle, DE
  • Average visibility in July: 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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