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Extreme heat for several more days but above-average heat could continue for weeks

Posted at 3:22 PM, Aug 17, 2020

Sunday Paso Robles hit 114, only 1 degree off the all-time record high of 115. We'll be close today and the forecast is to actually set the record Tuesday. Tuesday the ridge of high pressure aloft and surface high pressure should peak. The strength of high pressure usually only develops about once a decade or longer.

With several more days of extreme heat inland this brings in a lot of personal safety issues: power supply for cooling, personal behavior to mitigate heat-related illness, and fire weather risk.

Not only will the temperatures be extremely high there is also above average humidity which means the body can't manage heat as efficiently. Higher humidity also produces warmer overnight lows.

The all-time high in Paso Robles is 115 degrees set back on July 20, 1960 and again on September 2, 2017.
As far as the rest of the area goes, temperatures will also be quite warm to hot. Coastal valleys should hit the upper 80s and 90s while beaches are the only place where some onshore winds are producing some cooling. Some beaches will remain in the 70s and 80s, that said beaches like Avila Beach, Cayucos and Shell could all be quite warm since NW winds are not cooling wind directions for SW facing beaches.

More tropical leftovers are possible into next weekend which brings thunderstorm potential and muggy air again.

Climate prediction center likes California to be warmer than average in both the 6-10 day outlook and the 8-14 day outlook.