San Francisco Bay Area Weather Forecast (Including Santa Cruz County) – (1 to 2 days) – Mostly clear today into tonight becoming mostly cloudy late tonight and Wednesday morning turning partly cloudy in the afternoon.  Westerly winds increasing to 10 to 20 knots with stronger gusts near the coast in the afternoons and evenings.  High temperatures in the high 50’s to low 60’s near the coast into the upper 70’s inland.  Low temperature mostly in the low to mid 50’s.

Extended Forecast for Central California (Including Napa County south to Monterey County and east into the Sierras –  (3 to 7 days – (09/21/17 -09/25/17) –   Mostly clear Wednesday night through Monday, except for partly cloudy in the far north Wednesday night and mostly cloudy over the Sierras with a chance of showers Wednesday night and Thursday becoming partly cloudy with a slight chance of showers Thursday night and Friday. High temperatures in the 50’s to low 60’s near the coast into the mid 70’s in the far inland valleys through Friday then warming into the mid 80’s inland over the weekend and high 80’s inland by Monday.  Low temperatures mostly in the 50’s to low 60’s.

Extremely Long Range Weather Outlook Northern and Central California 8 to 15 days (09/26/17 – 10/03/17) – Mostly fair with late night and morning low clouds near the coast at times and a slight chance of showers late in the period over the south and Sierras. Near normal temperatures turning cooler inland.

Extremely Long Range Weather Outlook Northern and Central California 16 to 20 days (10/04/07 – 10/07/17) – Mostly fair during the period except for late night and morning low clouds and patchy fog near the coast at times and a slight chance of showers early in the period over the north and Sierras.  Near normal temperatures.

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Short Term Weather 1 to 7 day Forecast Discussion –  The jet stream has strengthened across the Northeast Pacific into the Pacific Northwest coast with rain showers spreading south to the far north coast of Calfornia that will continue through midweek and a slight chance of showers south into the far north bay on Wednesday, otherwise mostly fair and breezy weather will hold over Central California through much of the work week.  A trough will deepen over California on Wednesday bringing cooler and breezy conditions with temperatures only into the 70’s in the far inland valleys and showers over the mountains through Thursday. High pressure will build again late in the week over California for warmer weather over the weekend into early next week.

Northern and Central California 8 to 15 day extended forecast–  High pressure will develop off the coast of California with mostly west to northwest winds aloft keeping California mostly fair with patchy low clouds spreading into coastal areas at times during the period.  A weak trough will develop off the south coast late in the period increasing the marine layer along the coast into coastal valleys and giving Southern California a chance of showers, especially over the Sierras. Temperatures will turn cooler.

Northern and Central California 16 to 20 day extended forecast–  Computer models are suggesting an upper level low will move through Central and Southern California with a slight chance of showers over the Sierras early in the period. Temperatures will average slightly below normal during the period then turn a little warmer as higher pressures build in ahead of a deep trough in the Central Pacific.