San Diego residents can look forward to a seesawing weather pattern this week, courtesy of a series of atmospheric shifts detailed in a recent National Weather Service San Diego update. NWS San Diego forecasts that temperatures will remain near or slightly above average until Monday, so those fall wardrobes might not get heavy use just yet. Coastal areas will see highs ranging from 73 to 82 degrees, while the low deserts may heat up to a toasty 87 to 91 degrees.
However, the weather will take a cooler turn midweek. According to the Area Forecast Discussion released by NWS San Diego, a closed low west of Southern California is expected to move across the area by Wednesday, causing highs for inland locations to be 7 to 12 degrees below average. They note that some mountain locations, particularly unlucky, could see highs 15 to 20 degrees below what they're used to for this time of year.
On the coast, fog remains a shy visitor, with only a slight chance to develop after 09z on Monday. Commuters and mariners should remain vigilant, as visibility may drop significantly as the fog becomes potentially more widespread on Monday and Tuesday mornings. It's worth noting that the weather service has refrained from requesting Skywarn activation, indicating a lesser degree of concern.
Looking ahead toward the week's end, a weak ridging is anticipated to bring a few degrees of warming, a trend carrying into next weekend when a deep trough of low pressure from the Gulf of Alaska may dip into the US West Coast, although "most of the ensemble guidance keeps the low off the coast of the Pacific Northwest through next Saturday," which suggests dry conditions might persist for a bit longer. The mild chaos of the moment is the uptick in winds over the mountains and deserts, as a byproduct of the constant dance between cooler, windier spells and fleeting warm respite, per the NWS San Diego.
