Humidity and temperatures combine to make this season feel moderately cold. Highs range from 73.2°F (22.9°C) and 53.1°F (11.7°C) with warmer temperatures in the later months. Rain is somewhat common with 7 to 11 days of significant precipitation per month. Spring is the second busiest for tourism, which makes it a good time for those looking for things to do (source)
Grand Teton National Park
Summers often bring afternoon thunderstorms, and lightning storms are common. The mild temperatures make it ideal for touring Grand Teton’s higher elevations. Average summer daytime temperatures range in the 70s with lows at nights in the upper 30s and lower 40s. When hiking and backpacking, you can wear shorts or leggings (up to your discretion). Mornings are chilly and can quickly become warm when the sun is present. Evenings can get chilly quickly once the sun goes down, especially in higher elevations.