At any time of year, it is important to keep in mind that weather in the mountains can be highly unpredictable. A mild, sunny 75-degree day can quickly turn into a tumultuous storm, complete with wind, rain and
snow (in this region, it can snow any month of the year
It pays to always be prepared for cool or wet weather while enjoying the blue skies and warm, sunny days that typify a Yellowstone summer. Even at the peak of summer, mornings can be quite chilly. To prepare for these variable temperatures, we recommend wearing layers that you can easily peel off as the day warms up, including gloves and a hat.
It is essential that all travelers have waterproof rain gear, should we experience inclement weather. 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. September and early October are cooler than the summer months (again, with the possibility of snow), but weather is
usually very comfortable in the fall. No matter when you visit, we highly recommend bringing plenty of sunscreen
and a hat, as sunburn happens more quickly at high elevations.
AVERAGE MONTHLY TEMPERATURES & PRECIPITATION
(in Fahrenheit and inches)
Header Credit: Henry Holdsworth