Extended heat wave expected to bring several days of triple-digit temperatures, warmer nights and increased wildfire concerns beginning Friday
If you’ve been putting off that hike, yard project or day at the lake, Thursday may be your last comfortable opportunity.
Beginning Friday, summer is expected to crank up another notch as an extended heat wave settles over Northern California, bringing several consecutive days of triple-digit temperatures to Folsom and much of the Sacramento region. Forecasts call for highs climbing to around 105 degrees through much of the weekend and into next week, making it the hottest stretch of weather the area has experienced so far this summer.
That also means Folsom Lake, Lake Natoma, neighborhood pools and splash pads are likely to become some of the busiest places in town as residents look for relief from the heat. While the region’s waterways will offer a welcome escape, officials caution that dehydration, prolonged sun exposure and heat-related illness remain risks even while spending the day on the water.
The National Weather Service Sacramento said the gradual warming trend will continue through Thursday before gradual goes out the window and widespread triple-digit temperatures arrive Friday and persist through at least Tuesday. Current forecast guidance places Folsom in the low 100s Friday before temperatures peak around 104 to 106 degrees Saturday through Monday.
Unlike a typical hot summer weekend, this heat wave is expected to linger for nearly a week, allowing the effects of extreme heat to build with each passing day.
Meteorologists say the culprit is a massive dome of high pressure building across California and much of the western United States.
Often referred to as a “heat dome,” the system acts much like placing a lid over the atmosphere. Air trapped beneath it slowly sinks toward the ground, compressing and warming as it descends. At the same time, cloud formation is suppressed, allowing uninterrupted sunshine to bake the landscape day after day.
One factor making this event especially concerning is the expected loss of one of the Sacramento region’s greatest summertime advantages—the Delta breeze.
Normally, cooler marine air flows inland during the afternoon and evening, helping shave several degrees off daytime highs while providing much-needed overnight relief. This weekend, however, forecasters say the strengthening heat dome will essentially shut that natural cooling system down.
Without the Delta breeze, daytime temperatures are expected to climb even higher while overnight lows remain unusually warm, giving homes—and people—little opportunity to cool down before the next day’s heat returns. Those warmer nights are one of the reasons prolonged heat waves can become especially dangerous, as the body has less time to recover from daytime heat stress.
The warming trend will be noticeable each day. Wednesday saw temperatures climb into the upper 90s across much of Sacramento County. Thursday will offer one more relatively manageable day before readings climb into the low 100s Friday. By Saturday, nearly the entire Central Valley is expected to exceed 100 degrees, with parts of the northern Sacramento Valley reaching between 105 and 110 degrees.
For Folsom, current projections keep temperatures hovering around 105 degrees through much of the weekend before slowly easing during the middle of next week.
The soaring temperatures aren’t the only concern accompanying this weather pattern.
Very low humidity levels are expected to develop across Northern California as the heat intensifies, creating elevated fire weather conditions from Friday through Sunday. Relative humidity values are forecast to fall into the low teens—and even single digits in some areas—allowing vegetation to dry quickly and making it easier for fires to ignite and spread.
The National Weather Service is encouraging residents to avoid activities capable of creating sparks, including operating equipment over dry grass, improperly discarding cigarettes and parking vehicles where hot exhaust systems can come into contact with dry vegetation.
The prolonged heat has also prompted Sacramento County to activate additional hot weather services.
Through a partnership with First Step Communities, the Department of Homeless Services and Housing has opened its weather respite center at North A Shelter, located at 1400 North A Street in Sacramento. The center is operating daily from 1 p.m. to 8 p.m. through Aug. 6, offering visitors an air-conditioned place to cool down, along with meals, drinking water, restroom facilities, charging stations and light case management services.
Officials recommend calling 2-1-1 before traveling to verify available capacity.
Staying safe during the heat wave
Whether you’re planning to spend the weekend boating on Folsom Lake, paddleboarding on Lake Natoma or simply relaxing at home, officials recommend staying ahead of the heat rather than reacting to it.
Complete outdoor work during the early morning hours whenever possible, drink water regularly before you become thirsty and take frequent breaks in the shade or air conditioning. Those spending time on the water should remember that while lakes provide welcome relief, the sun’s reflection can increase exposure and dehydration can happen more quickly than many people realize. Bringing extra drinking water, wearing sunscreen and taking breaks out of direct sunlight remain just as important on the water as they are on land.
Residents are also encouraged to check on elderly neighbors, relatives and anyone living alone to make sure they have working air conditioning and plenty of water. Pet owners should provide constant access to shade and fresh water, avoid walking dogs on hot pavement during the afternoon and never leave children or animals inside parked vehicles, even for a short time.
Signs of heat exhaustion include heavy sweating, dizziness, nausea, weakness and muscle cramps. Heat stroke is a medical emergency that may include confusion, unconsciousness or hot, dry skin, and anyone showing those symptoms should be cooled immediately while someone calls 911.
Northern Californians are no strangers to summer heat, but forecasters say this isn’t just another hot weekend. Several days of consecutive triple-digit temperatures, warmer nights and exceptionally dry air can quickly add up, making preparation just as important as finding ways to stay cool.
For now, Thursday offers one last opportunity to enjoy comparatively milder weather so it should be a perfect night to enjoy those local outdoor concerts at the Historic Folsom Amphitheater and El Dorado Hills Town Center. By Friday, the heat will be on for what looks to be a sizzling weekend.
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