How Hot Is the Bottom of the Grand Canyon? Seasonal Extremes

Temperatures at the canyon floor (Phantom Ranch, ~750 m / 2,460 ft) are significantly warmer than the rims due to adiabatic compression and trapped heat.

• Summer (Jun–Aug): Highs often 40–46°C (104–115°F); occasionally higher.
• Winter (Dec–Feb): Lows near -1°C (30°F); highs 10–15°C (50–60°F).
• Spring/Fall: Mild, ideal for hiking (15–25°C / 60–77°F).

The vertical relief creates microclimates: the North Rim (2,450 m) can be 15–20°C cooler than the river. Hikers must prepare for extreme heat in summer—carry ample water, start early, know heat illness signs.