The Memorial Day weekend will be cooler than normal. But the summer months will likely be hotter than average, and the seasonal monsoon will be weak, making for fewer thunderstorms, the National Weather Service says.
The marine layer could be as much as a mile deep on Saturday, preventing temperatures from rising above 64 degrees in San Diego.
The layer will be thinner on Sunday. But the high will only get to 66.
Memorial Day will top out at 67. The average daytime high this time of year is 70.
Forecasters say the temperature could drop into the upper 50s on Saturday night, when the Padres host the New York Yankees at Petco Park. The game starts at 7 p.m.
Sea surface temperatures also will remain on the cool side, ranging from 62 to 64 degrees. Separate swells out of the south and the west will produce 2-to-4-foot waves in most areas on Saturday.
The weather service’s newly issued summer forecast says that temperatures are likely to be warmer than normal from July through September across San Diego County, particularly in the local mountains and deserts.
Long-term computer models also suggest that the seasonal monsoon will be milder, with less tropical moisture arriving from Mexico. That would reduce the chances that thunderstorms will start wildfires in the backcountry. It also would mean that less humid air will spread to the coast.
Forecasters also say that the heavy rain the county received during the winter will tamp down the threat of wildfires, likely into late August.
