Yosemite National Park is known for spectacular spring and fall thunderstorms,
as well as thick winter snows and warm, dry summers. Temperatures and conditons vary by elevation. Always bring raingear and optional warm clothing when visiting the park.

Avg max high/low temps for Yomsemite Valley. Subtract 10 or 20 degrees from the following temps for higher elevations:

January: High 49, low 26
July: High 90, low 54
September: High 87, low 47