Residents across the Southwest are swapping their spring jackets for sunblock this weekend as a powerful ridge of high pressure settles over the region. Forecasters are warning that a major warmup is officially underway, threatening to push temperatures into the triple digits for the first time this year in several major cities.
By Sunday, the heat will stretch from Reno, Nevada, up toward Boise, Idaho, challenging long-standing daily records along the way.
While this Mother’s Day heat wave isn’t expected to be quite as intense as the historic spike seen back in March, it marks the first time many areas have felt this level of heat since last August. In cities like Phoenix and Palm Springs, the mercury is projected to hit a blistering 110 degrees.
This surge is arriving weeks earlier than usual, as the first 110-degree day typically doesn’t hit the desert floor until mid-June.
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AccuWeather Senior Meteorologist Tyler Roys noted that the speed of the warmup is a primary concern. “Temperatures will rise by 20 to 30 degrees Fahrenheit in just a few days, which may catch people off guard,” Roys said.
He pointed out that Las Vegas and Fresno are both on track to hit 100 degrees for the first time in 2026. While the March event saw temperatures 40 degrees above the norm, this current wave is expected to hover between 15 and 25 degrees above the 30-year average.
The sudden spike poses more than just a risk of sunburn. Experts are keeping a close eye on mountain snowpack, as the heat is expected to trigger rapid melting. This creates a dangerous situation in local waterways where streams and rivers can swell with cold, fast-moving water.
“Cold water shock is a real risk for anyone trying to cool off,” Roys warned, adding that the heat could also disrupt outdoor graduations and holiday barbecues. He emphasized that early-season heat is particularly hazardous because the human body hasn’t had time to acclimate to the higher temperatures yet.
Safety remains the top priority for those heading outdoors. Meteorologists recommend staying in the shade, where the body’s heat load can be reduced by 10 to 20 degrees compared to standing in direct sunlight. Hikers are being told to stick to shorter trails and avoid the peak sun hours of late morning through the afternoon.
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There is also a growing concern for wildfires; despite the spring greenery, the combination of high heat and ongoing drought means that any spark could quickly get out of control.
Interestingly, not everyone in the West will be feeling the burn. The California coast is expected to stay relatively comfortable thanks to a persistent marine layer and sea breezes keeping the heat at bay in San Francisco, Los Angeles, and San Diego. Meanwhile, the Northwest will see a more moderate version of the warmup.
Highs along the I-5 corridor will reach the 70s and 80s, which is still significantly higher than normal for May. AccuWeather Meteorologist Melissa Constanzer noted that these June-like temperatures could be a struggle for residents in the interior Northwest, where many homes lack air conditioning.
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