Weather Underground broadcasts hourly and 10-day forecasts, plus a local radar map with current temperature data from a location near Groveland, 25 miles northwest of Yosemite's Big Oak Flat entrance.
The National Weather Service, besides being the source for the forecasts shown above, provides a 7-day forecast for Yosemite Valley. Click wherever you'd like on the map at this site to see additional forecasts for various elevations in Yosemite.
And finally, for a more visceral weather report, check out the Park Service's
Many of the webcam thumbnails link to larger images with current temperature information; click on the thumbnails to see the larger versions.
|Month||High | Low
|High | Low
|January||49 | 26||9 | -3||6.2 (15.7)|
|February||55 | 28||13 | -2||6.1 (15.5)|
|March||59 | 31||15 | 0||5.2 (13.2)|
|April||65 | 35||18 | 2||3.0 (7.6)|
|May||73 | 42||23 | 5||1.3 (3.3)|
|June||82 | 48||28 | 9||0.7 (1.8)|
|July||90 | 54||32 | 12||0.4 (1.0)|
|August||90 | 53||32 | 11||0.3 (0.8)|
|September||87 | 47||30 | 8||0.9 (2.3)|
|October||74 | 39||23 | 4||2.1 (5.3)|
|November||58 | 31||14 | 0||5.5 (14)|
|December||48 | 26||9 | -3||5.6 (14.2)|
Yosemite Valley, along with Wawona Meadow, lies at an elevation of 4,000 feet (1,200 meters). Only the Hetch Hetchy area is lower. The Glacier Point Road starts at an elevation of 6,000 feet (1,800 meters) and climbs from there, and the Tioga Road ranges from 6,000 to 10,000 feet (1,800 to 3,000 meters). So expect temperatures in most other areas of the park to be lower than they are in Yosemite Valley.
If you're driving in Yosemite in winter, you're required to carry tire chains in your car. Check the Yosemite Road Conditions page for more information.