Summer. Daytime temperatures are often around 70F (25C) and occasionally 80F (30C) at lower elevations. Nights are usually cool and temperatures may drop below freezing at higher elevations. Thunderstorms are common in the afternoons.
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The weather in Yellowstone in August is pleasant and mild, with average temperatures ranging from 40 degrees Fahrenheit as the low and 70 degrees Fahrenheit as the high. Additionally, there is no snowfall during this month of the year, and only about an inch and a half of rain.
Because of its altitude, on average nearly 7,500 ft (2300 m) above sea level, Yellowstone has long, cold winters. Temperatures can drop below -40ºF (-40ºC) and several feet of snowfall is common throughout the park.
Yellowstone National Park can get very crowded during peak season (June, July, and August). The best months to visit Yellowstone are April, September, and October. These “off season” months provide more chances to catch a glimpse of the local wildlife and enjoy thinner crowds.
Summer Visit to YellowstoneWaterproof and windproof outer layer: Lightweight, and breathable if possible. Both jacket and pants are recommended. Two Hats: A brimmed one for sun protection and possibly for rain and an insulating one for cool weather (May, June, September, and October.)
The best time to visit Yellowstone is early to mid-September because the weather is reliable and it is less crowded than in the summer months. It's the right mixture of good weather and fewer crowds.
My best advice for Yellowstone in July or August is to pack summer clothing for outdoors. Make sure to also carry a sweater and a thin rain jacket just in case it gets colder or you get caught in the rain.
Generally speaking, April, May and June have the most rain, or even snow; July and August are the driest and warmest months, with temperatures typically rising into the 70s and 80s.
Yellowstone is a busy place in the summer. Over 2,5 mln of people visit Yellowstone in the summer months (June-August), with July being an absolute peak season.
Even in peak summer season, it's possible to avoid crowds. The trick is to be either an early bird or late afternoon adventurer. Yellowstone is normally busiest from 9 a.m. to 3 p.m., and the stretch between Yellowstone's West Entrance to Old Faithful usually has the most traffic.
Staying in Yellowstone is the best way for visitors to experience everything the park has to offer. With nine lodging facilities offering over 2,000 rooms in the summer, accommodations in Yellowstone are plentiful for those wishing to experience the national park in its summertime glory.