How hot will SLO get this weekend? Here’s our forecast
After a week of heat advisories and even extreme heat warnings for much of the San Luis Obispo area – with Tuesday high temps reaching 89 degrees for SLO and all the way to 111 degrees in Shandon – much of the Central Coast is thankfully cooling off a touch just in time for the weekend.
Earlier this week, high pressure air further up in the atmosphere was dominating the skies and pushing temperatures in California’s interior well above 100 degrees. With that, even temperatures along the coast have reached well into the 80s and 90s. A string of heat advisories that have persisted from SLO County south to Los Angeles since Monday have expired. The high pressure in the upper atmosphere has weakened, and is now moving eastward.
This translates to temperatures moderating back to average for this time of year, with highs in the mid-70s for SLO proper. Even some of the morning marine layer fog will return, with near widespread fog expected along the coast and inland early Sunday morning.
A typical July weekend in store
The timing of this cooldown couldn’t be better for the Central Coast’s packed weekend calendar. The 40th annual Central Coast Renaissance Festival takes over Laguna Lake Park in SLO on Saturday and Sunday. Up in Paso Robles, it'’ the opening weekend for the California Mid-State Fair.
For the city of SLO itself, highs both days should land right around the mid-to-upper 70s — textbook for mid-July. Light winds out of the west-southwest at under 10 knots and mostly sunny skies will make for a pleasant, low-key weekend whether inland or on the coast.
Those inland valleys are where the difference will really be felt. Paso Robles will settle with highs in the mid- to upper 80s. That’s a roughly 20-degree drop from earlier this week — a huge swing that Mid-State Fair attendees will certainly appreciate. Coastal towns Morro Bay and Pismo Beach will be cooler still, likely hovering in the mid-60s and low 70s.
One thing beachgoers should keep an eye on: Tropical Storm Elida and a trailing disturbance out in the eastern Pacific are expected to push a south-southwest swell toward south-facing beaches starting Sunday. That swell could produce potentially hazardous surf conditions into early next week, so check conditions before heading out.
Looking ahead — nice and easy, more monsoonal moisture possible
Zooming out, the weekend really is quite nice for the rest of California at large. Weakening high pressure to our east is slowly reducing scorching hot temperatures from earlier this week and diminishing the monsoonal moisture that provided unseasonable rain showers and thunderstorms.
Both of these features may make a return later next week. There are early signs that a “ridge” of high pressure to the east may strengthen for late July. If it does this and stays in its current position — or even moves a bit back west — it would invite more monsoonal moisture from the tropics across California alongside warmer temperatures.
There is also a decent reason to believe this might not materialize – intense smoke from ongoing wildfires in Ontario, Canada, and Minnesota are covering the skies across the Midwest and Northeast. Smoke is so dense in spots that it is meaningfully lowering temperatures and altering the careful dance of air pressure across the continent. If this continues, it could keep the hottest temperatures next week away from California.
This story was originally published July 17, 2026 at 6:00 AM with the headline "How hot will SLO get this weekend? Here’s our forecast."
