Marine Weather and Tide Forecast for Monte Sereno, CA

SHORT TERM
Issued at 1201 PM PDT Sat Apr 18 2026 (This evening through Sunday)

High clouds continue to stream in from the west, yet will have very little impact on high temperatures this afternoon. We are forecasting mid 60s to lower 70s in the northwest facing locations and low-to-upper 70s elsewhere. There is a greater than 50% probability for Concord, San Jose, Gilroy, Hollister, and King City to exceed 80 degrees F on this afternoon (but less than 10% of exceeding 85 degrees F).

Tonight and into Sunday morning, expecting low clouds to return to the coast and coastal adjacent valleys as moisture increases ahead of an approaching mid/upper level low. This low will also cool temperatures slightly as clouds increase, most notability in the North Bay and San Francisco Bay Area. Meanwhile, the Central Coast will remain quite warm across the interior Sunday afternoon.

LONG TERM
Issued at 1201 PM PDT Sat Apr 18 2026 (Sunday night through next Friday)

The progression of the anticipated cold front has slowed down by about 12-18 hours. However, we still expect pre-frontal rain showers to begin Monday morning across the North Bay and then spread southward across the Bay Area. Outside of the coastal ranges of the Central Coast, we may see very little rainfall on during the day Monday. The main cold front is now expected to move across the Bay Area and Central Coast on Tuesday morning. By Tuesday afternoon and evening, we have the greatest potential for thunderstorms with up to 30% across much of the region as up to 500 J/kg of surface based CAPE is forecast. We are mostly forecasting this rainfall to be beneficial, but urban and poorly drained areas may experience flooding concerns during periods of heavy rain showers and/or thunderstorms. The WPC has a Marginal Risk of Excessive Rainfall (at least 5%) from the Santa Cruz Mountains northward on Day 3 (5 AM Monday - 5 AM Tuesday). However, we are not expecting any major river flooding with this event.

Post-frontal rain showers and possible thunderstorms (generally less than 15%) linger into Wednesday afternoon as a colder air mass settles in behind the cold front. Drier conditions look to return to the region for the latter half of the week with troughing forecast by the clusters.

AVIATION
(18Z TAFS)
Issued at 1100 AM PDT Sat Apr 18 2026

High clouds are building across the area with moderate winds building into the afternoon. Winds become light into the evening and into the night with low clouds building along the coast. IFR CIGs look to affect HAF and and the Monterey Bay terminals overnight and through much of Sunday morning. Winds stay light for most areas through Sunday morning, but moderate southwest winds begin to build that afternoon.

Vicinity of SFO...VFR through the TAF period. High clouds will build through the day and into Sunday. Expect west-northwest winds to build through the afternoon but ease into the late night. Winds stay light through early Sunday afternoon before moderate west-southwest winds build.

SFO Bridge Approach...Similar to SFO.

Monterey Bay Terminals...VFR lasts into the the night. Expect moderate northwest winds to build into the afternoon and ease into the late evening. IFR CIGs build at MRY and around the Monterey Bay coastline into the night, but don't reach SNS until the late night.
Winds will stay light through Sunday morning, but CIGs will erode in the mid to late morning.

MARINE
(Today through Thursday)
Issued at 1100 AM PDT Sat Apr 18 2026

Light winds and seas last through the rest of the weekend.
Northerly winds shift and become southerly Sunday ahead of an incoming low pressure system and cold front. Winds will strengthen ahead of the cold front Monday through Tuesday with localized strong gusts expected. Expect moderate seas, rain and a slight chance to chance of thunderstorms Monday night and Tuesday.

MTR WATCHES/WARNINGS/ADVISORIES
CA...None.
PZ...None.