San Francisco Bay Area Forecast 1 to 2 days (09/27/21-09/28/21)–  Mostly cloudy today and tonight with a slight chance of showers mostly north of the Golden Gate this afternoon and evening becoming partly cloudy on Monday. High temperatures in the 50’s to mid 60’s near the beaches into the high 60’s to low 70’s in the coastal valleys warming into the high 70’s in the inland valleys today. A little warmer on Tuesday. Low temperatures in the 50’s. Light winds except westerly 10 to 20 knots near the coast mostly in the afternoons. Chance of rain 20% this afternoon and evening.

Extended Forecast for 3 to 7 days Central California (Including Napa County south along the Big Sur Coastline (09/29/21 -10/03/21 – Mostly clear Tuesday night through Sunday, except for patchy low clouds near the coast at times. High temperatures in the 50’s to the low 70’s near the coast into the high 70’s to low 80’s in the coastal valleys and into the high 80’s further inland. Low temperatures in the 50’s to low 60’s.

Long Range Weather Outlook Northern and Central California 8 to 15 days (10/04/21 – 10/11/21)– Mostly fair with with low clouds at times near the coast at the beginning of the period then a chance of rain or showers in the north late in the period. Temperatures averaging near normal during the period.

Very Long Range Weather Outlook Northern and Central California 16 to 20 days (10/12/21 – 10/16/21) – Unsettled with a chance of rain at times in the north otherwise partly cloudy with a slight chance of showers further south during the period. Temperatures averaging near to slightly below normal

Northern and Central California 1 to 7 day forecast – Skies are mostly cloudy over Northern California with increasing clouds over North Central California this morning as a fairly strong trough moves into Northern California with showers being reported along the north coast. Showers will spread south today with diminishing amounts of rain further south into northern sections of the Bay Area by tonight. At this time, little or no precipitation is expected south of the Golden Gate with only less than a tenth of an inch possible in the north bay. Skies will be clearing on Tuesday except for lingering showers in far northern California. High pressure will build as the trough moves inland on Tuesday for a return to fair weather for the remainder of the week over all of California.

Northern and Central California 8 to 15 day extended forecast –   The most recent computer models show the Pacific jet stream staying mostly north of California with several troughs moving into Northern California later in the period. This pattern would lead to mostly fair weather during most of the period with occasional low clouds near the coast; however there will be a chance of rain in the north late in the period as a fairly strong trough approaches Northern California. Temperatures should average near normal during the period, but with fluctuations in high temperatures.

Northern and Central California 16 to 20 day extended Forecast – The most recent computer models show a strong jet stream into the Pacific Northwest and a low pressure trough near the California coast. This pattern would lead to unsettled weather in the north with a chance of rain at times otherwise partly cloudy with a slight chance of showers further south. Temperatures will stay a little below normal.