August weather forecast and climate
North Cascades National Park, WA

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, the last month of the summer, in North Cascades National Park, is also an agreeable month, with average temperature varying between 69.8°F (21°C) and 44.6°F (7°C).

Temperature

The warmest months are July and August, with an average high-temperature of 69.8°F (21°C).

Rainfall

August is the month with the least rainfall in North Cascades National Park. Rain falls for 9 days and accumulates 1.65" (42mm) of precipitation.

Daylight

In August, the average length of the day is 14.3h.

Sunshine

In North Cascades National Park, the average sunshine 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. A UV Index estimate of 6 to 7 represents a high threat to health from unsafe exposure to the UV radiation for ordinary individuals.
Note: The daily maximum UV index of 7 interpret into the following advice:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. 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. 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.
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FAQ

What is the warmest month in North Cascades National Park?

Warmest months are July and August, with an average high-temperature of 69.8°F (21°C).

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

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

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

In August, in North Cascades National Park, Washington, the rain falls for 9 days. Throughout August, 1.65" (42mm) of precipitation is accumulated.

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" (42mm) of precipitation.

What is the average length of the day in August in North Cascades National Park?

The average length of the day in August is 14.3h.

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

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

What are the months 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, Washington.

What is the UV index reading 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 health vulnerability from unsafe exposure to the Sun's UV rays.

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).
Months with the lowest average high temperature are January and December (30°F).

  • Average low temperature in August: 45°F

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: 14.3h

The month with the longest days is June (Average daylight: 16.1h).
The month with the shortest days is December (Average daylight: 8.4h).

  • Average sunshine in August: 8h

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

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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

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

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