As San Diegans prepare for the weekend, the National Weather Service in San Diego is predicting a slight cool-down along the coast. NWS San Diego provides a forecast indicating that coastal areas will see highs from 69 to 77 degrees on Friday, followed by a slight increase in temperatures over the weekend. Inland valleys, meanwhile, are expected to experience highs ranging from 80 to 87 degrees on Saturday.
A shift in the weather pattern is on the horizon, bringing coastal low clouds and fog beginning tonight, while the weekend heats up by a few degrees. As revealed in the Area Forecast Discussion by NWS San Diego, "A weak upper level low pressure system moving inland through California early this morning will bring a return of onshore flow for today into Friday." However, the marine layer is expected to deepen by early next week, signaling a cooldown.
San Diegans should expect "near average" temperatures on Friday, with the coastal areas cooling down to around 70 degrees and the Inland Empire heating up to the 80s. "High temperatures on Friday will range from around 70 near the coast to the 80s for the Inland Empire with the lower to mid 90s for the lower deserts," as stated in the NWS San Diego report. Despite the cooling trend, the mountains and deserts will remain stubbornly warm, with Friday's highs expected to stay 5 to 10 degrees above average.
Looking ahead to the next week, a gradual strengthening of onshore flow will help keep the thermostat in check. The cooler air is anticipated to spread inland, particularly noticeable from Monday through Wednesday. Said the Area Forecast Discussion, "Cooler high temperatures will spread inland for Monday through Wednesday." While Monday and Tuesday might see a slower cooling, by Wednesday, the change will become more apparent. Maritime fog is cropping up for early risers in the coastal regions, causing visibility reductions possibly below 1 nautical mile, while beachgoers should be prepared for elevated surf of 3 to 5 feet with locally higher sets on southwest-facing beaches kicking in on Friday and lasting through the weekend.
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