Downtown is expected to reach the lower 70s after 2 p.m. - that’s 7 to 10 degrees higher than April’s average daytime temperature of 63 degrees. Temperatures should quickly rise over the morning, reaching the upper 60s by noon. Patches of fog are on tap for the hills and west side through 9 a.m. San Francisco: A clash between cool, moist air and warm, dry air is slated for most of the city on Wednesday. This heat wave is then looking to flow out of California by Saturday night, allowing temperatures to return to normal by the end of the weekend. Nighttime temperatures are expected to remain consistent throughout the duration of the heat wave, with most of the coast and inland areas in the Central Valley likely to experience lows in the 40s and 50s. Wednesday night’s low temperatures across the Bay Area, with widespread 40s and lower 50s on tap by the water and mid- to upper 50s farther inland. Still, this ridge of high pressure responsible for the hot weather isn’t set to have major impacts on nighttime temperatures, so residents can get some relief once the sun goes down. The moderate heat risk will also extend into parts of the Central Valley by Thursday and into Saturday, where residents in cities like Fresno and Bakersfield can expect daytime temperatures in the 90s. This moderate heat risk includes places like the Salinas Valley, where daytime temperatures are likely to reach the lower 90s through Saturday. And because this is the first big warm-up of the year, sensitive populations, including outdoor laborers and those who have limited access to shade, will face heightened risk of heat-related illnesses. Outside San Francisco, daytime highs are likely to reach the upper 80s to lower 90s by Wednesday afternoon, with more widespread 90s possible on Thursday and Friday. A few places like San José are looking to get close to 90 degrees in the afternoon. Wednesday’s high temperatures across the Bay Area, with widespread 70s along San Francisco Bay and 80s farther inland. These are places where temperatures rarely go beyond the upper 70s, making residents more susceptible to spikes in warm weather compared to communities in more inland regions like San José and Walnut Creek. The National Weather Service is calling for a slight heat risk across much of the Bay Area this week, with temperatures likely reaching the 70s and lower 80s along San Francisco Bay. Slight heat risk (yellow) is expected along much of San Francisco Bay and the Sacramento Valley. Thursday’s heat risk outlook, with moderate risk (in orange) from hot weather possible across most of the East Bay, South Bay and Salinas Valley. In places like the Bay Area this is important since microclimates and socioeconomics vary widely between neighborhoods and cities. The National Weather Service forecasts heat risk based on climate and societal factors like age, sensitivity to warm weather, income and access to cooling shelters. Temperature is one of many elements at play when it comes to how vulnerable communities are to heat. A ridge of high pressure will bring with it heat risks for residents across coastal cities like San Francisco and San Diego, but more widespread high temperatures will be concentrated inland by Thursday and into the weekend.
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