During the summer months, average temperatures in the backcountry (7,000-10,000’) range between 65-75°F during the day and 30-40°F at night. Multi-day storm systems are rare, however, rain or snow showers can happen any afternoon in the summer, so it is important to bring proper rain gear.  Each part of the season has different historical characteristics. Here’s a link to our favorite and most accurate high elevation forecast: NOAA Yosemite High Country Weather. For day trips in and around Yosemite Valley (4,000’), you can expect warmer temperatures (averaging mid 70s- high 80s°F and lows of 40-50°F) Yosemite Valley Weather.