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

As North Cascades National Park, Washington, transitions into May, a marginal rise in the average high-temperature is observed, moving from a chilly 48.2°F (9°C) in April to a refreshing 55.4°F (13°C). In North Cascades National Park, an average low-temperature of 35.6°F (2°C) is recorded during May nights.

Rainfall

In North Cascades National Park, in May, during 12 rainfall days, 2.44" (62mm) of precipitation is typically accumulated. In North Cascades National Park, during the entire year, the rain falls for 157 days and collects up to 51.02" (1296mm) of precipitation.

Daylight

The average length of the day in May is 15h and 18min.
On the first day of May in North Cascades National Park, 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 in North Cascades National Park, Washington, is 7h.

UV index

The average daily maximum UV index in May in North Cascades National Park is 6. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 6 in May translates into these instructions:
Take precautions against overexposure. Protection against sun damage is needed. Remember that UV radiation from the Sun is strongest between 10 a.m. and 4 p.m. Make an effort to limit direct sun exposure during this time. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.