May 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 May

May, the last month of the spring, in North Cascades National Park, is a mild month, with average temperature fluctuating between 35.6°F (2°C) and 55.4°F (13°C).

Temperature

In May, the average high-temperature slightly increases, from a chilly 48.2°F (9°C) in April, to a mild 55.4°F (13°C). In North Cascades National Park, in May, the average low-temperature is 35.6°F (2°C).

Rainfall

In North Cascades National Park, during May, the rain falls for 12 days and regularly aggregates up to 2.44" (62mm) of precipitation. 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

In North Cascades National Park, the average length of the day in May is 15.3h.

Sunshine

In May, the average sunshine in North Cascades National Park is 7h.

UV index

In May, the average daily maximum UV index in North Cascades National Park is 6. A UV Index reading of 6 to 7 represents a high threat to health from the exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 in May interpret into the following advice:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.
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FAQ

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

The average high-temperature, in May, in North Cascades National Park, is 55.4°F (13°C), while the average low-temperature is 35.6°F (2°C).

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

In North Cascades National Park, Washington, in May, it is raining for 12 days, with typically 2.44" (62mm) of accumulated precipitation.

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

In May, the average length of the day in North Cascades National Park is 15.3h.

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

In May, the average sunshine is 7h.

What is the UV index intensity in May in North Cascades National Park?

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

Average temperature in May
North Cascades National Park, WA

Average temperature in May - North Cascades National Park, WA
  • Average high temperature in May: 55°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 May: 36°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 May
North Cascades National Park, WA

Average rainfall in May - North Cascades National Park, WA
  • Average rainfall in May: 2.4"

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 May
North Cascades National Park, WA

Average rainfall days in May - North Cascades National Park, WA
  • Average rainfall days in May: 12 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 May /
Average sunshine in May
North Cascades National Park, WA

Average daylight in May / Average sunshine in May - North Cascades National Park, WA
  • Average daylight in May: 15.3h

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 May: 7h

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 May
North Cascades National Park, WA

Average UV index in May - North Cascades National Park, WA
  • Average UV index in May: 6

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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