Yosemite Weather in July

July is Yosemite at its most crowded and its hottest, and it's also the month everything is finally open. The Valley floor climbs into the 90s most afternoons, while the high country around Tuolumne Meadows stays cool enough to pull you upward once Tioga Road is running for the season. Half Dome's cables are up, the shuttle system is in full swing, and days are long enough to fit a sunrise start and a late dinner. It's peak season in every sense — full services, long daylight, and parking lots that fill before mid-morning most days of the week.

July's Valley-floor highs average around 90°F, with typical days running 82–90°F and overnight lows settling between 49°F and 55°F. Rain is scarce all month — about 0.3 inches total, virtually none of it snow — and you get roughly 14.5 hours of daylight to work with, plenty of time for an early trailhead start and a slow evening back at camp. The number that actually shapes your day is elevation: the high country around Tuolumne Meadows (about 8,600 ft) runs 20–30°F cooler than the Valley floor (about 4,000 ft), so plan for two different climates in the same afternoon if you're moving between them, and pack layers accordingly rather than dressing for just one.

July sits at the peak of Yosemite's high season, and it shows — crowd levels run Very High, with roughly three-quarters of the park's annual visitors arriving between May and September. Yosemite Valley's parking lots routinely fill by mid-morning on summer weekends and holidays, so a late start often means circling for a spot instead of hitting the trail. There's no timed day-use reservation required to enter the park this year, so anyone can show up whenever they like — which is part of why the roads and lots fill the way they do. Your best move is arriving at first light, well before the lots fill, or waiting until after dinner, when the crowds thin and the light turns golden.

This is the month the high country is fully open — Tioga Road and Glacier Point Road are running, Tuolumne Meadows is accessible, and the full Valley shuttle system is in service. Half Dome's cables are up, so with a permit in hand, July is prime cables season; just watch the forecast (more on that below). Long daylight hours make room for early starts on high-country trails before afternoon heat or storms build. Down in the Valley, the Merced River is the move on a hot afternoon — deep, calm stretches invite a swim, and water shoes help on the rocky entries. Clear nights also make July a strong month for stargazing, especially away from the Valley's ambient light.

Pack for heat and for cold, sometimes in the same day. Sun protection — a hat, sunglasses, and SPF 50+ — matters as much as anything in July's high-elevation sun, and plenty of water belongs in the car regardless of how short a hike looks on paper. Bring layers: a 90°F Valley afternoon can turn into a cool 55°F evening, and the high country runs 20–30°F cooler than the Valley floor at any given hour. Swimming in the Merced or at Tenaya Lake calls for water shoes on the rocky entries. Planning an overnight in the backcountry? Pack a bear canister — it's standard practice for any trip that involves camping out.

Tioga Road and Glacier Point Road are open for the season, giving full access to Tuolumne Meadows and the high country. The main hazard this month is weather, not snow: afternoon thunderstorms build quickly over Tuolumne Meadows, Clouds Rest, and the exposed granite domes, so plan to be off summits and ridgelines by early afternoon. If you're climbing Half Dome, don't attempt the cables in rain or with storms in the forecast — they become extremely dangerous wet, and people have died up there in bad conditions. At elevation around Tioga Pass and Tuolumne Meadows, UV is stronger and altitude can bring on headache or fatigue, so acclimatize gradually and reapply sunscreen more than feels necessary. The most dangerous high water near Vernal and Nevada Falls typically eases by July, but stay behind the railings regardless.