Mount Rainier National Park Weather in May

May in Mount Rainier National Park averages 3°C (37°F) during the day and -8°C (18°F) at night. Quite a bit of snow/rainfall is typical this month, with around 152 mm (6 in) on average. An umbrella is a good idea.

Rainfall in Mount Rainier National Park in May

Typically, about 18 days will experience snow/rainfall, with an average of 152 mm (6 in) for the month. This is a wet month with frequent and often heavy showers. Both the number of rain days and the total rainfall are high.

Temperature in Mount Rainier National Park in May

Expect highs of 3°C (37°F) in Mount Rainier National Park in May, with nights dropping to around -8°C (18°F). Expect a distinctly cold feel throughout the day, not just overnight. With lows of -8°C (18°F), nights are freezing. Packing a spare blanket is worth considering if you're staying somewhere that might not be fully heated. This month is extremely cold, so be sure to dress in layers to keep warm. Proper preparation can help you stay comfortable.

Sunshine in Mount Rainier National Park in May

There are approximately 247 hours of sunshine this month, resulting in mostly clear days. Despite the cool temperatures, the sunshine makes it an enjoyable time to be outside.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. July and August typically offer the best weather for Mount Rainier National Park.