August weather forecast
North Cascades National Park, WA

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The lovely Picture Lake reflecting the trees on the shores and the distant Mount Shuksan in the North Cascades National Park, Washington, USA
The lovely Picture Lake reflecting the trees on the shores and the distant Mount Shuksan in the North Cascades National Park, Washington, USA

Weather in August

August emulates July with the temperature also reaching a maximum average of 70°F (21.1°C). The park’s weather, however, remains predictably sunny and warm, providing excellent conditions for exploring and enjoying its majestic landscape. As a testament to its alluring appeal, August often sees the highest number of visitors taking advantage of the weather and long daylight hours. Despite less rainfall and only nine rainy days, the park maintains its lush green appearance. A slightly increased amount of sunshine hours compared to previous months captures the epitome of summer in the park.

Temperature

North Cascades National Park sees its peak of temperatures during July and August, with an average high-temperature of 69.8°F (21°C).

Rainfall

The month with the least rainfall is August, when the rain falls for 9 days and typically collects 1.65" (42mm) of precipitation.

Daylight

In August, the average length of the day in North Cascades National Park is 14h and 18min.
On the first day of August, sunrise is at 5:40 am and sunset at 8:42 pm. On the last day of the month, sunrise is at 6:21 am and sunset at 7:48 pm PDT.

Sunshine

In North Cascades National Park, Washington, the average sunshine in August is 8h.

UV index

June through August, with an average maximum UV index of 7, are months with the highest UV index in North Cascades National Park, Washington. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum high UV index of 7 in August translates into the following recommendations:
Beware of overexposure. Fair-skinned individuals risk burning in less than 20 minutes. Avoid direct exposure to the Sun between 10 a.m. and 4 p.m., the peak period for UV radiation, noting that objects like parasols or canopies might not offer complete sun protection. Experience reduced UV exposure by about half when donning a wide-brim hat.
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Frequently asked questions

What is the hottest time of year in North Cascades National Park?

The warmest period in North Cascades National Park, with an average high-temperature of 69.8°F (21°C), falls in July and August.

What is the usual temperature for North Cascades National Park in August?

An average high-temperature, in August, in North Cascades National Park, is 69.8°F (21°C) and the average low-temperature is 44.6°F (7°C).

What is the driest month in North Cascades National Park?

The month with the least rainfall is August, when the rain falls for 9 days and typically collects 1.65" (42mm) of precipitation.

How much does it rain in North Cascades National Park in August?

In North Cascades National Park, Washington, in August, during 9 rainfall days, 1.65" (42mm) of precipitation is typically accumulated.

How many hours of daylight does North Cascades National Park have in August?

In August, the average day length in North Cascades National Park, Washington, is 14h and 18min.

When are sunrise and sunset in August in North Cascades National Park?

In August, on the first day of the month, sunrise is at 5:40 am and sunset at 8:42 pm. On the last day of the month, in North Cascades National Park, Washington, sunrise is at 6:21 am and sunset at 7:48 pm PDT.

How long on average sun shines in August in North Cascades National Park?

In North Cascades National Park, Washington, the average sunshine duration in August is 8h.

When is the highest UV index in North Cascades National Park?

June through August, with an average maximum UV index of 7, are months with the highest UV index.

How high is the UV index in August in North Cascades National Park?

The average daily maximum UV index in August in North Cascades National Park is 7. A UV Index value of 6 to 7 symbolizes a high hazard to health from unprotected exposure to UV radiation.
Average rainfall days
Average daylight
Average sunshine
Average UV index

Average temperature in August
North Cascades National Park, WA

Average temperature in August - North Cascades National Park, WA
  • Average high temperature in August: 70°F

The warmest months (with the highest average high temperature) are July and August (70°F).
The months with the lowest average high temperature are January and December (30°F).

  • Average low temperature in August: 45°F

The months with the highest average low temperature are July and August (45°F).
The coldest months (with the lowest average low temperature) are January and December (18°F).

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Average rainfall in August
North Cascades National Park, WA

Average rainfall in August - North Cascades National Park, WA
  • Average rainfall in August: 1.7"

The wettest month (with the highest rainfall) is December (7.8").
The driest months (with the least rainfall) are July and August (1.7").

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Average rainfall days in August
North Cascades National Park, WA

Average rainfall days in August - North Cascades National Park, WA
  • Average rainfall days in August: 9 days

The month with the highest number of rainy days is December (18 days).
The month with the least rainy days is July (8 days).

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Average daylight in August /
Average sunshine in August
North Cascades National Park, WA

Average daylight in August / Average sunshine in August - North Cascades National Park, WA
  • Average daylight in August: 14h and 2min

The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 18min).

  • Average sunshine in August: 8h

The month with the most sunshine is July (Average sunshine: 9h).
The months with the least sunshine are January, November and December (Average sunshine: 2h).

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Average UV index in August
North Cascades National Park, WA

Average UV index in August - North Cascades National Park, WA
  • Average UV index in August: 7

The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, November and December (UV index 1).

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North Cascades National Park, Washington, USA

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