May weather forecast
North Cascades National Park, WA

The arrival of May further enhances the outdoor potential of North Cascades National Park. Temperature increases from the previous month are distinctly noticeable, and spring continues to flourish across the region. The park, warmed by increased sunshine hours, blossoms with a vibrant mix of wildflowers taking over the once snow-covered trails. Despite these changing conditions, rainfall in the park, while decreasing, still plays a significant role in the overall weather. Many prefer to visit in May due to these more favorable conditions and because the summer crowd has not yet arrived.

Temperature

North Cascades National Park's transition into May is marked by a minor temperature shift, moving from a frosty 48.2°F (9°C) in April to a moderate 55.4°F (13°C). North Cascades National Park's nights in May experience an average temperature drop to a cold 35.6°F (2°C).

Rainfall

In May, the rain falls for 12 days. Throughout May, 2.44" (62mm) of precipitation is accumulated. Throughout the year, there are 157 rainfall days, and 51.02" (1296mm) of precipitation is accumulated.

Daylight

In May, the average length of the day is 15h and 18min.
On the first day of May, sunrise is at 5:43 am and sunset at 8:21 pm. On the last day of the month, sunrise is at 5:06 am and sunset at 8:59 pm PDT.

Sunshine

The average sunshine in May is 7h.

UV index

In North Cascades National Park, the average daily maximum UV index in May is 6. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In May, the maximum UV index of 6 suggests these recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Stay sun-safe with clothing that is both closely woven and worn loosely.