August weather forecast
New Castle, NH

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Weather in August

In August, the temperature remains relatively stable, with little difference from July. Rainfall becomes less frequent, and the number of sunshine hours continues to be high. Clear skies provide unlimited visibility, enhancing the overall summer feel. The sea temperature still remains warm, inviting people to participate in various marine activities.

Temperature

New Castle's shift from July to August is accompanied by an average high-temperature of a still moderately hot 75.7°F (24.3°C), a slight deviation from 76.3°F (24.6°C). Nightly temperatures in New Castle drop to an average low of 61.7°F (16.5°C) in August.

Humidity

In August, the average relative humidity in New Castle is 79%.

Rainfall

In August, the rain falls for 12.8 days. Throughout August, 2.09" (53mm) of precipitation is accumulated. Throughout the year, there are 144.2 rainfall days, and 27.48" (698mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

The month with the warmest seawater in New Castle is August, with an average ocean temperature of 65.7°F (18.7°C).
Note: Most individuals do not find swimming at 65.7°F (18.7°C) to be enjoyable. As the water temperature declines below 69.8°F (21°C), maintaining control over one's breathing becomes harder.

Daylight

The average length of the day in August is 13h and 53min.
On the first day of August, sunrise is at 5:34 am and sunset at 8:03 pm. On the last day of the month, sunrise is at 6:06 am and sunset at 7:18 pm EDT.

Sunshine

August has the most sunshine of the year in New Castle, with an average of 10.6h of sunshine.

UV index

July and August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: In August, the UV index of 6 transforms into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. Experience reduced UV exposure by about half when donning a wide-brim hat.
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Frequently asked questions

What are the temperatures in New Castle in August?

New Castle in August has an average high-temperature of 75.7°F (24.3°C) and an average low-temperature of 61.7°F (16.5°C).

What is the average humidity in August in New Castle?

In August, the average relative humidity in New Castle, New Hampshire, is 79%.

How much does it rain in New Castle in August?

In August, in New Castle, the rain falls for 12.8 days. Throughout August, 2.09" (53mm) of precipitation is accumulated.

When it does not snow in New Castle?

May through September are months without snowfall.

What month is the ocean warmest in New Castle?

August is the month with the warmest seawater in New Castle, with an average ocean temperature of 65.7°F (18.7°C).

What is the ocean temperature in August in New Castle?

In New Castle, the average seawater temperature in August is 65.7°F (18.7°C). For most, swimming in 65.7°F (18.7°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

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

In New Castle, the average day length in August is 13h and 53min.

When are sunrise and sunset in August in New Castle?

In August, on the first day of the month, sunrise is at 5:34 am and sunset at 8:03 pm. On the last day of the month, in New Castle, sunrise is at 6:06 am and sunset at 7:18 pm EDT.

What month has the most sunshine in New Castle?

The month with the most sunshine in New Castle is August, with an average of 10.6h of sunshine.

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

In New Castle, the average sunshine duration in August is 10.6h.

What is the month with the highest UV index in New Castle?

The months with the highest UV index in New Castle, New Hampshire, are July and August, with an average maximum UV index of 6.

How high is the UV index in August in New Castle?

In August, the average daily maximum UV index in New Castle is 6. A UV Index reading of 6 to 7 represents a high hazard to health 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 August
New Castle, NH

Average temperature in August - New Castle, NH
  • Average high temperature in August: 75.7°F

The warmest month (with the highest average high temperature) is July (76.3°F).
The month with the lowest average high temperature is January (31.8°F).

  • Average low temperature in August: 61.7°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 (21.2°F).

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Average pressure in August
New Castle, NH

Average pressure in August - New Castle, NH
  • Average pressure in August: 29.97"Hg

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in August
New Castle, NH

Average wind speed in August - New Castle, NH
  • Average wind speed in August: 6.7mph

The windiest month (with the highest average wind speed) is January (11.7mph).
The calmest month (with the lowest average wind speed) is July (6.6mph).

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Average humidity in August
New Castle, NH

Average humidity in August - New Castle, NH
  • Average humidity in August: 79%

The month with the highest relative humidity is June (80%).
The months with the lowest relative humidity are April and November (75%).

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Average rainfall in August
New Castle, NH

Average rainfall in August - New Castle, NH
  • Average rainfall in August: 2.09"

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is September (1.54").

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Average rainfall days in August
New Castle, NH

Average rainfall days in August - New Castle, NH
  • Average rainfall days in August: 12.8 days

The month with the highest number of rainy days is June (15 days).
The month with the least rainy days is January (7.5 days).

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Average snowfall in August
New Castle, NH

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

The month with the highest snowfall is January (4.02").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in August
New Castle, NH

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

The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in August
New Castle, NH

Average sea temperature in August - New Castle, NH
  • Average sea temperature in August: 65.6°F

The best month for swimming (with the highest average sea temperature) is August (65.6°F).
The coldest month (with the lowest average sea temperature) is March (38.5°F).

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

Average daylight in August / Average sunshine in August - New Castle, NH
  • Average daylight in August: 13h and 5min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in August: 10h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

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Average sunshine days in August
New Castle, NH

Average sunshine days in August - New Castle, NH
  • Average sunshine days in August: 15.5 days

The month with the most sunshine days is September (16.8 days).
The month with the least sunshine days is April (13.2 days).

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Average UV index in August
New Castle, NH

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

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in August
New Castle, NH

Average cloud cover in August - New Castle, NH
  • Average cloud cover in August: 29

The month with the most cloud cover is March (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 29).

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Average visibility in August
New Castle, NH

Average visibility in August - New Castle, NH
  • Average visibility in August: 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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New Castle, New Hampshire, USA

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