What should I pack for San Diego?

The single most common packing mistake for San Diego is leaving the jacket at home. The marine layer rolls off the Pacific most mornings. Temperatures at Ocean Beach and Coronado drop to 16-18°C until 10 or 11 a.m., even in August. By 2 p.m. you might hit 27°C in Hillcrest and peel off everything you layered at breakfast. A packable windbreaker weighing under 300g solves this temperature swing. Three cotton t-shirts rotate fine for a week. San Diego runs casual to a degree that surprises East Coast visitors. Gaslamp Quarter restaurants where entrees hit $30-45 won't turn you away in clean shorts and a collared shirt. Flip-flops appear at North Park brunch spots, Pacific Beach taprooms, even wedding rehearsal dinners in Coronado.

San Diego's sun hits harder than most visitors expect. The city logs about 266 sunny days per year, and the UV index reaches 10-11 from late May through September. Bring reef-safe SPF 50. La Jolla Cove sits above a protected marine reserve where oxybenzone sunscreens damage the kelp forests and the bright-orange Garibaldi fish you can spot snorkeling 3 meters from shore. A wide-brimmed hat beats a baseball cap for protecting your neck during a 3-hour walk through Balboa Park, where the 1,200-acre grounds offer limited shade between the 17 museums. Polarized sunglasses cut the glare off the water at Sunset Cliffs. The afternoon reflection there will give you a headache inside 20 minutes without them.

Walking shoes for San Diego need to handle more than sidewalks. Balboa Park's paths alternate between paved promenades and packed-dirt trails with exposed tree roots near the San Diego Zoo, which has covered 100 hilly acres since it opened in 1916. The trails at Torrey Pines State Natural Reserve north of La Jolla climb about 90 meters over crumbly sandstone, and smooth-soled sneakers slip on the descent. You'll want shoes you can rinse, too. Sand from Mission Beach works its way into everything. If you're heading to Cabrillo National Monument at the tip of Point Loma, the tide pools mean stepping on algae-slick rock in water up to your ankles.

Four travel staples cost less at San Diego stores than at the airport, so skip packing them. Beach towels run a third of the departure-lounge price at Mission Valley retailers. Sunscreen at any Gaslamp drugstore beats duty-free. Current conditions as of mid-August 2026 sit around 21°C with 83% humidity, warm and sticky enough that you'll want a refillable water bottle on every outing. San Diego's tap water lacks the mineral tang you get in Phoenix or Las Vegas. It comes partly from Sierra Nevada snowmelt and partly from the Carlsbad desalination plant, which opened in 2015. Umbrellas are dead weight from June through October. The city averages about 260 mm of rain per year, almost all of it falling between November and March.