Portland vs San Diego

Portland

Portland has a cool marine climate — famously rainy, but not in the way visitors expect. The rain is a persistent drizzle, not heavy downpours. Portland actually receives less annual rainfall (about 36 inches) than New York or Houston, but it is spread over 150+ rainy days from October through May. Summers (July through September) are gloriously dry, sunny, and warm. Winter brings occasional snow that typically melts within a day or two.

San Diego

San Diego has the best year-round climate of any major city in the continental United States — a Mediterranean climate with warm, dry summers and mild, occasionally rainy winters. Average temperatures stay between 57°F and 77°F all year. The main quirk is "May Gray" and "June Gloom" — a marine layer of coastal fog that rolls in from the Pacific each morning, usually burning off by noon but sometimes persisting all day along the beach.

Portland

Portland has the most useful public transit of any city its size on the West Coast. MAX light rail (5 lines) connects the airport, downtown, and key suburbs. The Portland Streetcar loops through downtown, the Pearl, and east side neighborhoods. TriMet buses fill in the gaps. Within individual neighborhoods — Pearl, Hawthorne, Alberta, Mississippi, NW 23rd — walking is the right answer. Portland is also one of the best US cycling cities with protected lanes and a cyclists-first culture.

Walkability: Portland is one of the most walkable large cities in the American West — grid-patterned, flat on the east side, and most interesting neighborhoods (Pearl, NW 23rd, Hawthorne, Division, Alberta, Mississippi, Belmont) have dense commercial strips. Downtown blocks are short (only 200 ft) which makes walking feel quicker. Expect rain 9 months of the year — a good waterproof shell is more useful than an umbrella in the Portland wind.

San Diego

San Diego is primarily a car-dependent city, though downtown, the Gaslamp Quarter, and Balboa Park are very walkable. The San Diego Trolley connects downtown with Mission Valley, Old Town, and the Mexican border. Getting to La Jolla, the beaches, and Coronado is most convenient by car or ride-hail. The Coaster commuter rail connects downtown to North County beaches.

Walkability: Downtown San Diego and the Gaslamp Quarter are highly walkable. Balboa Park, Little Italy, and the Embarcadero are all connected by foot. However, San Diego is a sprawling metro — getting between neighborhoods like La Jolla, Mission Beach, and Old Town requires wheels or a ride.