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From the California guide
Camp in this state lives across a real climate split, and it helps to picture each side of it. Near the coast an early-summer marine layer keeps mornings cool and gray until it burns off, while the interior valleys run hot enough by midsummer to feel like a different state entirely. The ocean stays cold through the season because of upwelling, so coastal swimming is bracing and wetsuits are normal well into summer, colder toward the north. The high country keeps a short, late season behind melting snow, and late summer carries a genuine wildfire-smoke risk in the ranges. The figures here are air temperatures for a coastal and an interior reference point; mountain and high-elevation sites will sit cooler than either, especially overnight.
Average at camp time
Coastal (Los Angeles)
June
72°high
61°low
July
75°high
64°low
August
77°high
65°low
Inland valley (Sacramento)
June
88°high
56°low
July
93°high
59°low
August
92°high
59°low
Temperature figures are drawn from NOAA/NCEI U.S. Climate Normals. Conditions vary within a state by region, elevation, and distance from the coast, so interior and higher areas generally run cooler than coastal or low-lying ones. Treat these as a general guide, not a forecast for any specific camp.
The way in depends on the corner of the state. For Southern California camp country the main gateway is Los Angeles (LAX), with San Diego (SAN) for the far-southern coast and the marine programs, and the Inland Empire airport at Ontario closer to the San Bernardino mountains. The Bay Area and the Northern California coast and redwoods come through San Francisco (SFO), with San Jose often nearer for the Santa Cruz mountains. For the Sierra, Sacramento (SMF) is the gateway to the northern and central range and the Tahoe region, and Fresno (FAT) is the natural hub for the southern Sierra and the lake camps on its western slope. For the far eastern side and North Tahoe, the honest nearest airport actually sits over the line in the neighboring state.
From any of these the pattern is the same: fast highway first, then a long, winding climb on narrow mountain roads into the timber, whether that is the Rim of the World route toward Big Bear, the Angeles Crest into the San Gabriels, or the grades up toward Huntington and Shaver on the Sierra's west side. Some routes close the loop differently. The island marine camps are reached by ferry or boat rather than any road, a genuine break in the drive-in map. The high trans-Sierra passes open only in the warm months. And for the backcountry expeditions the pavement simply ends at a trailhead, which is where the reachable map ends too. City day camps invert all of this, sitting inside the neighborhoods families already live in. Actual transport, pickups, and any shuttle are best settled directly with the camp.