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. 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

The warmest period is usually observed in July and August, with the average high-temperature peaking at 69.8°F.

Rainfall

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

Daylight

In North Cascades National Park, the average length of the day in August is 14h and 18min.
On the first day of August, sunrise is at 5:39 am and sunset at 8:43 pm. On the last day of the month, sunrise is at 6:20 am and sunset at 7:50 pm PDT.

Sunshine

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

UV index

June through August, with an average maximum UV index of 7, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 in August interprets into the following advice:
Prevent overexposure. Protection from the sun's harmful effects is needed. The Sun emits the most powerful UV radiation between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. Clothes that are both tight-knit and comfortably loose are prime choices for sun protection.
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FAQ

What is the warmest month in North Cascades National Park?

North Cascades National Park sees the average highest temperatures during the months of July and August, peaking at 69.8°F.

What are August temperatures in North Cascades National Park?

The average high-temperature and low-temperature in North Cascades National Park, Washington, during August are 69.8°F and 44.6°F respectively.

What is the driest month in North Cascades National Park?

August is the month with the least rainfall. Rain falls for 9 days and accumulates 1.65" of precipitation.

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

In North Cascades National Park, in August, it is raining for 9 days, with typically 1.65" of accumulated precipitation.

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

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

What time are sunrise and sunset in August in North Cascades National Park?

In August, on the first day of the month, sunrise is at 5:39 am and sunset at 8:43 pm. On the last day of the month, in North Cascades National Park, sunrise is at 6:20 am and sunset at 7:50 pm PDT.

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

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

What is the month with 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 in North Cascades National Park.

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

In North Cascades National Park, Washington, the average daily maximum UV index in August is 7. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to Sun's UV rays.
Average high temperature
Average low temperature
Average rainfall
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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