Bay Area's final June weekend brings milder coastal weather and inland heat
As June's final weekend approaches, the Bay Area is set for a weather pattern that's becoming all too familiar: a sharp contrast between a cool, compressed marine layer along the coast and a gentle warmup inland.
Unlike last weekend's blustery conditions, wind won't be a factor this time. However, the Peninsula and areas near the water will continue to experience cooler temperatures. San Francisco might finally hit the elusive 70-degree mark for the first time this month on Friday or Saturday. But don't get too excited as temperatures are expected to plateau on Saturday and even dip slightly on Sunday, as a weak upper-level low drifts in from the Pacific.
This incoming system won't cause any significant disruptions in the Bay Area, just slightly cooler temperatures on Sunday and Monday, along with a reinforced marine layer hugging the coast. It's a continuation of a persistent theme in June; frequent upper-level storm systems nudging their way down the West Coast, keeping much of coastal California cool and cloudy.
The result? One of the coolest Junes in decades for the Bay Area. This chilly trend extends through Central California, with several locations like Monterey and Napa tracking for their fifth coolest June on record, based on average maximum temperatures. Even the Central Valley, while not as cool, has bucked its usual trend of extreme heat in June. Sacramento, for instance, hasn't hit 100 degrees this month. If that holds through the month's end, it'll be the first June in nearly 20 years without at least one triple-digit day.
So what's in store as we approach the Fourth of July holiday week? The Climate Prediction Center's 6- to 10-day outlook suggests a return to warmer conditions. However, the devil's in the details. Some weather models hint at yet another upper-level low lingering off the California coast, which could keep cooler conditions in place as we flip the calendar from June to July.
Weekend breakdown
San Francisco: The city will see a stretch of seasonably mild, mostly cooperative weather heading into the weekend. Friday and Saturday start with patchy clouds, especially on the west side, but sunshine breaks out by midmorning both days. Expect highs near 70 degrees downtown and in the Mission, with low 60s west of Twin Peaks. Southwest winds pick up to 10 to 20 mph each afternoon. Sunday brings a slightly thicker marine layer. Low clouds may linger longer, especially in the Outer Sunset and Richmond, keeping highs in the low to mid-60s across the city. Eastern neighborhoods will still catch some sun by early afternoon, just not as much as Friday or Saturday.
North Bay: The region will run hot and sunny to close out the week, with Santa Rosa pushing into the low 90s on Friday and Saturday. Most other spots like Napa, Petaluma, Novato and San Rafael will be in the mid- to upper 80s under clear skies and barely a breeze. Sunday brings a touch more morning cloud cover and a subtle cooldown, but not enough to change plans. Expect highs in the upper 70s to mid-80s across the valleys, with Santa Rosa and inland Napa still flirting with the upper 80s by late afternoon.
East Bay: A warm and sunny stretch is ahead, with Friday and Saturday both delivering some of the nicest weather in some time. Temperatures will be in the mid- to upper 70s in Berkeley, Oakland and Richmond, the low 80s in Hayward and Fremont and low 90s across the Tri-Valley in Walnut Creek, Concord and Livermore. Sunday may bring a touch more marine influence near the bay, but inland spots will still heat up. Highs will be in the low to mid-70s along the water, with upper 80s to near 90 once you get east of the hills.
Pacific Coast and Peninsula: Clouds will hug the Pacific Coast each morning, but Friday and Saturday will still manage a decent dose of sunshine across the Peninsula. Coastal spots like Daly City and Pacifica will warm into the mid- to upper 60s, while across the Peninsula South San Francisco and San Mateo will see temperatures in the low 70s. Sunday brings a thicker marine layer and slightly cooler temperatures. Highs along the coast will settle back into the low to mid-60s, with inland Peninsula spots running a few degrees cooler than the previous days, generally upper 60s to low 70s.
South Bay and Santa Cruz: The region will be sunny and warm all weekend, with morning clouds near the coast. Friday and Saturday bring mid-80s to San Jose, Santa Clara and Cupertino, while Santa Cruz stays cooler but pleasant in the mid-70s. Sunshine should break out early inland, with slower clearing along the coast. Sunday will trend just a touch cooler, with low 80s inland and low 70s near the water, but skies stay mostly sunny.
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