<P> The construction of the Twin Peaks Tunnel in 1918 connected southwest neighborhoods to downtown via streetcar, hastening the development of West Portal, and nearby affluent Forest Hill and St. Francis Wood . Further west, stretching all the way to the Pacific Ocean and north to Golden Gate Park lies the vast Sunset District, a large middle class area with a predominantly Asian population . The northwestern quadrant of the city contains the Richmond, also a mostly middle - class neighborhood north of Golden Gate Park, home to immigrants from other parts of Asia as well as many Russian and Ukrainian immigrants . Together, these areas are known as The Avenues . These two districts are each sometimes further divided into two regions: the Outer Richmond and Outer Sunset can refer to the more western portions of their respective district and the Inner Richmond and Inner Sunset can refer to the more eastern portions . </P> <P> Many piers remained derelict for years until the demolition of the Embarcadero Freeway reopened the downtown waterfront, allowing for redevelopment . The centerpiece of the port, the Ferry Building, while still receiving commuter ferry traffic, has been restored and redeveloped as a gourmet marketplace . </P> <P> San Francisco has a warm - summer Mediterranean climate (Köppen Csb) characteristic of California's coast, with moist mild winters and dry summers . San Francisco's weather is strongly influenced by the cool currents of the Pacific Ocean on the west side of the city, and the water of San Francisco Bay to the north and east . This moderates temperature swings and produces a remarkably mild year - round climate with little seasonal temperature variation . </P> <P> Among major U.S. cities, San Francisco has the coolest daily mean, maximum, and minimum temperatures for June, July, and August . During the summer, rising hot air in California's interior valleys creates a low pressure area that draws winds from the North Pacific High through the Golden Gate, which creates the city's characteristic cool winds and fog . The fog is less pronounced in eastern neighborhoods and during the late summer and early fall . As a result, the year's warmest month, on average, is September, and on average, October is warmer than July, especially in daytime . </P>

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