Temperatures to Remain Cool Through Weekend

A low-pressure pattern more common in the dead of winter than the last days of summer will keep the weather cool and the possibility of showers hovering in the wings until Sunday, according to the National Weather Service in San Diego.

“The low pressure over San Diego was created Wednesday night by cold air coming in from Canada,” said forecaster Wilbur Shigehara. “That is very unusual for this time of year. It’s more common in December than September.”

But the high-level winds from Canada brought little moisture. A 20% probability of isolated rain throughout the county is in the forecast through Saturday. Without the cold Canadian air feeding into it, the low pressure will begin moving toward Santa Barbara on Saturday and a slow warming trend will begin Sunday in San Diego.

The low pressure won’t change coastal temperatures much but the inland areas will feel the cooling effects, Shigehara said. “The temperature at Lindbergh Field hit 75 on Thursday and if you drove 10 miles inland, it was still 75 degrees.”

Few inland areas had temperatures cresting the 80-degree mark Thursday. Most, such as Santee and Fallbrook, had temperatures in the upper 70s, and it’s going to stay that way through Saturday, Shigehara said.

At the beach, temperatures will range from 69 to 73 on Friday and increase a couple of degrees over the weekend. The water temperature is 67 with the surf at 2 to 3 feet.

In the coastal areas and inland valleys, the mercury will rise to 75 to 79 on Friday and inch up one or two degrees over the weekend. On the coast, nighttime lows will dip down to 63 to 69 and in the inland valleys to 56 to 64.

In the mountain areas, temperatures will range from 55 to 65 Friday and Saturday and rise a couple of degrees on Sunday. Nighttime temperatures will dip down to 38 to 48.

Desert temperatures will range from 88 to 96 on Friday and increase a couple of degrees both Saturday and Sunday. But few areas are expected to get too much past 100, Shigehara said. Nighttime temperatures will hover at 58 to 65.