Grand Teton National Park Thunderstorm – Wyoming
The weather in Grand Teton National Park can be highly variable, especially in late spring and summer. June often brings mild daytime temperatures ranging from the 60s to low 70s Fahrenheit, while nighttime temperatures can dip into the 30s and 40s. Snow may still linger at higher elevations, and alpine trails may remain partially covered. As the summer progresses, the park generally experiences clearer skies and warmer temperatures, though mountain weather can change rapidly.
Thunderstorms are a common occurrence in the afternoons, especially from late June through August. These storms typically build quickly due to the intense summer sun heating the mountain slopes, creating updrafts that lead to cumulonimbus cloud formation. Lightning, strong gusty winds, and sudden downpours can accompany these storms, posing risks to hikers and climbers above the treeline or on exposed ridges. Visitors are advised to start hikes early in the day and plan to be off high ground by early afternoon.
Despite the risks, thunderstorms add dramatic beauty to the Tetons, with striking cloud formations and the deep rumble of thunder echoing off the peaks. However, safety is paramount. It’s essential to monitor local forecasts, carry waterproof gear, and seek lower ground at the first signs of thunder or darkening skies. The grandeur of Grand Teton’s weather is part of its allure—but it demands respect and preparation.
