What to Wear in San Diego in Summer: Month-by-Month Outfit Guide
San Diego in summer sits in the 70 to 90°F range. This is the layer-by-layer outfit guide for San Diego's summer weather — what to wear, what to pack for a visit, and the local context that shapes the recommendations.
WHAT TO EXPECT
70 to 90°F is the typical range for San Diego in summer (June, July, August). June through September. 70-85°F at the coast, hotter inland. Light fabrics. The temperature range is the headline; what you actually feel depends on humidity, wind, and what indoor spaces you'll cycle through.
THE FOUNDATION LAYER
Lightweight, breathable single layer. Linen, cotton voile, or technical synthetic.
THE MID LAYER
Optional. A light cardigan or unstructured blazer handles cool mornings and air-conditioned interiors.
THE OUTERWEAR
Optional. A linen blazer or light overshirt handles cool evenings and indoor air conditioning.
ACCESSORIES
Sun hat, UV-rated sunglasses, sandals or breathable sneakers, and a light scarf for over-AC interiors.
WHAT TO PACK FOR A TRIP TO SAN DIEGO IN SUMMER
Three layer permutations covering the 70 to 90°F range, plus accessories. If your trip spans the season's edge (early March or late November), pack toward the cooler end of the range — overestimating warmth is easier to recover from than underestimating.
LOCAL CONTEXT
Coastal vs. inland temperature differences are dramatic — La Jolla can be 15°F cooler than El Cajon. Evening drops in any season — always carry a sweater.