The Bay Area’s brief warm spell will start looking more like a typical May pattern Wednesday: cool near the ocean, mild around the bay and still warm inland.
Highs are expected to reach the 80s across many inland valleys, with a few hotter spots near 90. But closer to the coast and bay, marine air will be more noticeable. San Francisco, the Peninsula coast and bayside communities should mostly stay in the 60s and 70s as afternoon onshore winds return.
The humidity recovery will also be uneven. Coastal and bayside areas should moisten first, while parts of the inland East Bay, South Bay and far North Bay remain dry through the afternoon. That could keep fire-weather concerns elevated in the hills and interior valleys, especially where dry grasses overlap with breezy afternoon winds. A broader cooldown and more widespread humidity recovery should arrive late this week as the marine layer rebuilds.
Wednesday breakdown
San Francisco: San Francisco’s brief warm stretch will fade Wednesday, though not evenly. Eastern neighborhoods, including the Mission, SoMa and downtown, should still climb into the upper 60s and low 70s during the afternoon. But west of Twin Peaks, the marine influence will be much more noticeable, with the Sunset, Richmond and Ocean Beach mostly in the upper 50s to low 60s. Morning clouds may be patchy, especially closer to the ocean, before partial clearing. West to southwest winds will increase during the afternoon, making the city feel cooler by evening. Clouds may increase again overnight, with lows mainly in the low to mid-50s…