Severe Thunderstorm and Tropical Storm Bertha Impacts

Numerous severe thunderstorms are expected across a broad region from the Ohio Valley to the Mid-Atlantic and Northeast States today into tonight. Swaths of damaging wind gusts are expected and some tornadoes are possible. Bertha is expected to bring tropical storm conditions to portions of the Gulf Coast from the Florida Panhandle westward to southeastern Louisiana later today and Wednesday. Read More >

Last Update: 848 AM PDT Tue Jul 21 2026

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San Francisco Bay Area/Monterey, CA Local Forecast Office

12NM SW San Francisco CA

Marine Zone Forecast

Today

NW wind around 5 kt. Seas 3 to 4 ft. Wave detail: NW 2 ft at 9 seconds and S 3 ft at 13 seconds. Patchy fog until late afternoon.

Tonight

W wind around 5 kt. Seas 3 to 5 ft. Wave detail: NW 3 ft at 8 seconds and S 4 ft at 11 seconds. Patchy fog.

Wed

S wind 5 to 10 kt. Seas 4 to 5 ft. Wave detail: NW 3 ft at 8 seconds and S 4 ft at 11 seconds. Patchy fog.

Wed Night

W wind around 5 kt. Seas 4 to 5 ft. Wave detail: NW 2 ft at 8 seconds and S 4 ft at 10 seconds. Patchy fog.

Thu

NW wind 5 to 10 kt, rising to 10 to 15 kt in the afternoon. Seas 3 to 4 ft. Wave detail: W 3 ft at 7 seconds and S 4 ft at 10 seconds. Patchy fog in the morning.

Thu Night

NW wind 10 to 15 kt. Seas 4 to 5 ft. Wave detail: NW 4 ft at 6 seconds and S 3 ft at 12 seconds.

Fri

NW wind 10 to 15 kt. Seas 4 to 5 ft. Wave detail: NW 4 ft at 7 seconds and S 2 ft at 14 seconds.

Fri Night

NW wind 10 to 15 kt. Seas 4 to 5 ft. Wave detail: NW 4 ft at 7 seconds and S 2 ft at 14 seconds.

Sat

NW wind 10 to 15 kt. Seas 4 to 5 ft. Wave detail: NW 4 ft at 7 seconds and S 2 ft at 14 seconds.

Sat Night

NW wind 10 to 15 kt. Seas 4 to 5 ft, building to 5 to 7 ft after midnight. Wave detail: NW 6 ft at 8 seconds and S 2 ft at 14 seconds.

.....san francisco bar/fourfathom bank forecast.....

in the deep water channel...mixed seas of 3 to 5 ft at 13 seconds.

across the bar...swell can be more than twice as high across the bar than surrounding waters. Waves are also more prone to break, particularly during strong ebb currents. Maximum ebb current of 1.4 kt at 10:53 am tuesday and 2.3 kt at 11:35 pm tuesday.

.....SAN FRANCISCO BAR/FOURFATHOM BANK FORECAST..... IN THE DEEP WATER CHANNEL...Mixed seas of 3 to 5 ft at 13 seconds. ACROSS THE BAR...Swell can be more than twice as high across the bar than surrounding waters. Waves are also more prone to break, particularly during strong ebb currents. Maximum ebb current of 1.4 kt at 10:53 AM Tuesday and 2.3 kt at 11:35 PM Tuesday.