August weather forecast
North Cascades National Park, WA

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.