June through September typically have warm days with highs in the 70os and 80os. June usually has sunny afternoons while July and August often have afternoon thunderstorms. The possibility of light snow always exists in the higher elevations, even in July and August. Expect cool nights with lows in the 30os to 50os. For summer trips, bring a sleeping bag rated at 10o-20o. Upon booking a trip, we will send you a recommended equipment list appropriate to your trip.