San Francisco Bay Area Weather Forecast (Including Santa Cruz County) – (1 to 2 days) – Mostly clear today through Sunday with warm temperatures near the coast and hot temperatures inland.  Westerly winds increasing to 10 to 20 knots with stronger gusts near the coast in the afternoons.  High temperatures in the low 70’s to low 80’s near the coast into the low 100’s inland today and from the low 60’s to low 70’s near the coast and low 100’s inland on Sunday. Lows mostly in the 50’s to low 60’s.

Extended Forecast for Central California (Including Napa County south to Monterey 3 to 7 days (06/25/18-06/29/18) – Mostly clear Sunday night through Friday, except patchy low clouds or fog near the coast Sunday night becoming more extensive near the coast and spreading inland through much of next week. High temperatures cooling into the high 50’s to low 70’s near the coast by Monday and into the mid 90’s in the far inland valleys.   Low temperatures mostly in the  low to mid 50’s.  

Long Range Weather Outlook Northern and Central California 8 to 15 days (06/30/18 – 07/07/18) –  Mostly fair except there will be occasional low clouds near the coast and a slight chance of showers and thundershowers over the mountains later in the period. Temperatures averaging near to slightly above normal during the period. .

Extremely Long Range Weather Outlook Northern and Central California 16 to 20 days (07/08/08 – 07/12/18) – Mostly fair except for low clouds and fog near the coast at times and a chance of showers and thundershowers over the mountains at times.  Normal temperatures.

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Short Term Weather 1 to 7 day Forecast Discussion –  High pressure will build over California today with warmer temperatures near the coast and hot weather for many inland valleys where temperatures will reach into the 100’s over the next several days.  The marine layer be diminished along the coast but temperatures near the coast will experience only moderate heating with highs in the the low 70’s to low 80’s with highs reaching into the 90’s in the coastal valleys over the weekend.  Warnings have been issued by the National weather Service for excessive heat for many interior valleys over the weekend. High pressure will begin weakening by Sunday and continue into next week allowing for the onshore winds to increase and the marine layer moving back to the coast and locally inland by early next week.  This will result in cooler weather beginning near the coast on Sunday and over the interior by Monday.

Northern and Central California 8 to 15 day extended forecast–  The latest computer models are showing  several troughs moving inland through the Pacific Northwest that will contribute to continued onshore flow of marine air from the Pacific at times during the period and periods of warmer weather as weak high pressure builds in behind the troughs.  Southerly flow will develop over the mountains later in the period leading to a slight chance of showers and thundershowers at times.

Northern and Central California 16 to 20 day extended forecast – The latest computer models are showing a trough of low pressure over the Pacific Northwest with high pressure over the four corners area resulting in warm to hot temperatures inland with near normal temperatures near the coast.   There will be a chance of showers and thundershowers over the mountains from moisture moving northward around the western states high pressure area.