The sun is again shining over the Bay Area after a string of historic storms, and after a chilly weekend, most of the region will also see temperatures return to near normal this week.
Following unseasonably cool temperatures on Saturday, some Bay Area cities crept closer to average Sunday, with highs in the mid- to upper 50s. Conditions were windy overnight and could still be gusty Monday morning, with a wind advisory in effect.
Wind speeds will gradually decrease throughout Monday, but the ocean tides will still be unsettled.
San Francisco Chronicle
Monday will be the last of the king tides for this month. High tide will be at 12:01 pm and pose another risk for flooding for coastal residents along the Pacific Coast, from Sonoma County to Santa Cruz County. Low tide will occur at 6:44 pm, with a height of -1.38 feet. Boaters may have an arduous time charting through shallow water.
San Francisco Chronicle
Sunshine will persist this week, and temperatures in San Francisco and most of the Bay Area will hover around average through Wednesday. However, North Bay valleys could turn even warmer starting Monday. Valleys can see a larger temperature swing from morning to the afternoon, mainly because of their landform.
Generally, warm air rises, cold air sinks. However, valley warming occurs when air goes down the mountain, the air warms and dries out.
San Francisco Chronicle
This process is called adiabatic heating. As the air descends, the pressure increases, and that volume of air compresses, resulting in an increase in temperature. That’s why the valley is warmer than the rest of the Bay Area.
Conversely, that’s why valleys get much colder than the surrounding region at night. Afternoon temperatures will be more of the same until Wednesday, with a warm-up starting Thursday.
Morning low temperatures will not be as chilly as what San Francisco experienced over the weekend. Temperatures will be in the mid-40s to start off Monday. Winds will be gusty between 20 to 30 mph until noon. The winds will gradually decrease throughout the day and will come from the north around 15 mph. Skies will be sunny, with afternoon temperatures reaching the upper 50s across most of the county. The cool spots will be along the western coast, including Baker and Ocean Beach, with highs in the mid-50s. The neighborhoods of Ingleside, Mission and Excelsior will reach the upper 50s. A few of the hilly neighborhoods, including San Miguel Hills, Twin Peaks and Sherwood Forest, will reach the mid- to upper 50s.
Pacific Coast and Peninsula
King tides will affect the Pacific Coast until Monday afternoon. In the morning, temperatures will range from the upper 30s to low 40s along the Sonoma County Coast, around the mid-40s across the Marin County coast and along the Peninsula coast, from Pacifica to Half Moon Bay. North winds could gust up to 30 mph. Skies will be filled with sunshine throughout the day.
Along the Peninsula, morning low temperatures will start off in the low to mid-40s. Afternoon temperatures will get to the mid- to upper 50s for places including Daly City, San Bruno, San Carlos and Redwood City. Coastal towns along the Peninsula from Pacifica to Half Moon Bay will be a few degrees cooler, with highs in the mid-50s
Coastal towns on the Sonoma County Coast, from Sea Ranch to Bodega Bay, will reach the mid-50s. The Marin County coast, from Dillon Beach to Bolinas Lagoon and as far down as the beaches along the Marin Peninsula, will reach the mid-50s.
Morning low temperatures will be in the mid-30s from Healdsburg to Petaluma. The rest of the North Bay will not be as cold, with temperatures in the low to mid-40s. North winds will be blustery until around 3 p.m. Winds will decrease by the afternoon to around 10 mph.
The warmest spots in the North Bay will be in Windsor, Santa Rosa and Rohnert Park, with highs in the low 60s. Along Interstate 80, from Vallejo to Fairfied, it will not be as warm, with temperatures in the mid-50s. The rest of the North Bay will fare somewhere in between, with afternoon temperatures in the mid to upper 50s.
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The morning will be the coldest for the inland valley, including cities from Concord to Sunol and Brentwood, with temperatures in the mid- to upper 30s. From Antioch to Hercules, morning temperatures will be in the low 40s. From Richmod to Hayward, temperatures will be in the low to mid-40s. Fremont will be the coldest along the bay, with a low temperature in the upper 30s. Northeast winds will be brisk until 3 p.m. with gusts up to 25 mph.
The skies will be bright and sunny during the day. Inland afternoon temperatures will reach the mid-50s from Pleasant Hill to Dublin and from Martinez to Oakley. In Oakland, San Leandro and San Pablo, temperatures will be slightly warmer, with highs in the mid to upper 50s.
South Bay and Santa Cruz
The morning will be cold, with temperatures ranging from the mid- to the upper 30s for the Santa Clara Valley, Scotts Valley in the Santa Cruz Mountains and along the coast in Santa Cruz County. North winds will be gusty at times, up to 25 mph, until noon. The wind will become lighter around 10 mph during the afternoon. A few clouds may dot the sky in the morning; otherwise, fair skies are expected until the sun goes down.
By the afternoon, mid- to upper 50s will be possible for San Jose, Campbell and Santa Clara. In Saratoga, Palo Alto, Milpitas and Alum Rock, temperatures will reach the mid-50s. Along Highway 101, Morgan Hill and Gilroy will also reach the mid-50s.
Communities in the Santa Cruz Mountains, including Ben Lomand, Felton and Scotts Valley, will reach the mid-50s. Closer to the ocean, Santa Cruz, Davenport and Watsonville will also reach the mid- to upper 50s. Monday will be the last day of king tides along the coast, with high tide at noon and low tide at 6:44 pm.
The weather pattern will continue to be dry and sunny this week. Thursday could be the Bay Area’s warmest day of the week. Santa Rosa and San Jose could get to the mid-60s — around 3 to 5 degrees above average.
San Francisco Chronicle
Afternoon high temperatures will back down slightly on Friday, reaching the upper 50s to lower 60s.
Michelle Apon is a San Francisco Chronicle newsroom meteorologist. Email: [email protected] Twitter: @MichelleApon
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