High pressure aloft coupled with offshore flow will bring another warm day to the Central Coast, but a shift in the weather pattern is just 24 hours away. The heat advisories that have been in place this week are set to expire at 5 p.m. Friday but before they do, some coastal and inland valley communities could experience daytime highs 15-20 degrees above average. For example, San Miguel is expected to reach 101 degrees Friday but daytime highs for inland valleys across San Luis Obispo County usually are usually close to 79 degrees this time of the year.
Smoke from nearby wildfires, like the Creek Fire, made its way into the Central Coast Thursday. Smoky conditions are expected to continue Friday, which means air quality across San Luis Obispo County could affect those with pre-existing health conditions. Air quality levels for SLO County will be at a moderate level while Santa Barbara County will range from good to moderate.
The weekend ahead will be cooler as onshore flow makes a return to bring temperatures down. Temperatures along the coast will likely return to the 70s Saturday and be back in the 60s by Sunday. Simultaneously, cooling will bring inland and coastal valley temperatures down to the 80s and 90s Saturday before tapering off to the 70s and 80s by Sunday. It's possible, that some inland valley locations could still be hanging on to the low 90s by the end of the weekend, but cooler conditions are expected to continue through next week. With that, marine layer is back Friday morning, prompting a marine statement for local mariners off the south coast of Santa Barbara County. The foggy overnight conditions are expected to increase through the weekend and into next week, which could bring temperatures at the coast to below normal conditions and near normal conditions for valley locations.