A fresh start to the week for the Bay Area
Monday, July 7, 2025 — NEW YORK (10:30 AM ET) – A sluggish upper-level low sitting just offshore is keeping the Bay Area in a cooler-than-average pattern this Monday morning, with widespread cloud cover, patches of drizzle, and below-normal temperatures continuing through Tuesday.
This upper-air system, while not a storm producer, is expanding the marine layer, pulling it farther inland during the early morning and overnight hours. With dry air embedded in this system, expect few showers but plenty of clouds, especially near the coast and around the bay.
Temperatures Monday will range about 5°F (2.8°C) below normal near the coast and bay, while inland valleys could dip as much as 10°F (5.6°C) below typical mid-July levels. Expect upper 50s to low 60s°F (15–17°C) in San Francisco, while temperatures gradually climb to the 70s°F (21–26°C) and low 80s°F (27–28°C) moving deeper into the East Bay, South Bay, and North Bay valleys.
Warming midweek, but no heat dome expected
By Wednesday, a ridge of high pressure will strengthen over the Southwest, slowly pushing warmer air westward. This will send temperatures in Arizona, southern Nevada, and interior Southern California into the 100s to 110s°F (38–43°C).
In the Bay Area, the real warm-up arrives Wednesday into Thursday, with Thursday likely to be the hottest day. However, this is not expected to evolve into a prolonged, record-breaking heat dome. Interior zones may reach the upper 90s°F (36–37°C), with isolated spots hitting the triple digits°F (38–40°C).
Fortunately, the high pressure center will remain well to the south, and onshore winds will continue to moderate coastal and bay temperatures, keeping highs in those zones in the 70s and 80s°F (21–29°C).
Forecast by region
San Francisco: A thick marine layer will blanket the city throughout Monday morning, possibly producing light drizzle. Expect upper 50s°F (14–15°C) in the Richmond and Sunset areas, with mid-60s°F (17–18°C) in Downtown and the Mission District. Southwest winds will blow at 10 to 20 mph, and clouds will roll back in overnight, with lows in the 50s°F (10–13°C).
North Bay: Morning clouds will extend inland past Highway 101 into areas like Vallejo, before retreating to the coast by midday. Highs will hover in the low to mid-70s°F (22–24°C) in San Rafael, Santa Rosa, Napa, and Vallejo, rising closer to 80°F (27°C) in Fairfield and Vacaville. Nighttime lows fall into the 50s°F (10–13°C).
East Bay: The marine layer will cover areas west of the Berkeley Hills early, then sunshine will emerge inland and gradually expand westward. Look for highs in the low to mid-70s°F (22–24°C) in Richmond, Oakland, and Hayward, with the Tri-Valley warming into the low 80s°F (27°C). Coastal clouds return overnight, but skies stay clear inland, with lows in the 50s°F (10–13°C).
Pacific Coast and Peninsula: Cloud cover will remain dominant through Monday, holding temperatures down. Expect highs in the low 60s°F (16–17°C) in Half Moon Bay, Pacifica, and Daly City. Across the Peninsula, clouds will thin by afternoon, with highs in the upper 60s to mid-70s°F (20–24°C) in South San Francisco and San Mateo. Overnight, expect a return to widespread clouds and lows in the 50s°F (10–13°C).
South Bay and Santa Cruz: Morning fog and cloud cover will blanket Silicon Valley and hug the Santa Cruz coastline, but sunshine will break through by midday. Highs reach the upper 70s to low 80s°F (26–28°C) in San Jose, Santa Clara, and Cupertino, while Santa Cruz struggles to break 70°F (21°C). Skies turn cloudy again overnight, with temperatures dipping into the 50s°F (10–13°C).
Short-term outlook remains uncertain
Forecast models diverge later in the week. Some runs show the high-pressure ridge reorganizing closer to the Bay Area, potentially pushing temperatures higher again by the weekend. But there’s no strong evidence yet of a sustained or extreme heat wave on the horizon for Northern California.
