The calendar still says it is summer, but a cold storm system that originated in the Gulf of Alaska will settle over the central San Joaquin Valley on Tuesday, dropping the high temperature into the 70s and 80s and even raising the chance of snow showers along the peaks of the Sierra.
The National Weather Service said that Tuesday’s high temperature will be about 15 degrees below normal for this time of year, which is about 94 degrees.
“In the higher elevations of the Sierra, temperatures will be cold enough that there could be a few snow showers above 9,500 feet,” the weather service said, adding heavier showers could make up to an inch of snow in the high country.
The arrival of the low-pressure system was signaled by winds along the west side on Monday. The weather service issued a wind advisory for gusts up to 35 mph for Los Banos, Coalinga, Mendota, Hanford, Lemoore, Avenal and Corcoran.
Tuesday’s high in Fresno is expected to be 77 degrees, a major difference from Monday’s high of 90. At that, it would be the coolest day in Fresno since May 29, when it was 79.
The overnight low will be 54 – about 10 degrees cooler than recent mornings. Wednesday’s high will be near 82. Starting Friday, highs return to the 90s, and it could be 96 degrees by Sunday, the weather service said.
Shaver Lake will see a high Tuesday of just 61 degrees, with the low falling to 41, the weather service said. Yosemite Village will have a high of 70 and a 20 percent chance of showers. The overnight low there will be 44 degrees.
Weather service meteorologist Jim Bagnall said the up-and-down temperatures are normal as summer heat ebbs. “We are getting to the transitional time when we will be in a roller-coaster pattern,” Bagnall said.
He noted that the average high in Fresno at the start of September is 94. By month’s end, the high has dropped to 86 degrees.