The best time to visit Mount Rainier is generally July and August. It is a national park in Washington.
July and August tend to bring the best balance of weather, access and conditions. Around then, daytime highs average about 56°F and overnight lows near 40°F.
Weather patterns at Mount Rainier are strongly influenced by the Pacific Ocean and elevation. The climate is generally cool and rainy, with summer highs in the 60s and 70s. While July and August are the sunniest months of the year, rain is very likely in spring, fall, and winter. Visitors should be aware that mountain weather is very changeable. In the higher elevations, like Paradise, winter can last from November to May with many feet of snow on the ground.
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