Boise and much of southwest Idaho will bake under more extreme heat Sunday, with highs near 96 degrees before relief arrives midweek. The National Weather Service warns that afternoon temperatures could push into the upper 90s, increasing the risk of heat-related illness for anyone outdoors too long. Drivers on Interstate 84 should prepare for hazy skies Sunday morning as patchy smoke lingers across Ada and Canyon counties.
According to the National Weather Service, conditions begin to shift late Monday into Tuesday when showers and thunderstorms bring a chance of brief cooling. Boise can expect a 30 percent chance of storms Tuesday afternoon, with scattered showers lingering into Wednesday and Thursday.
Sunday’s heat wave comes on the heels of several consecutive hot days, leaving little overnight relief as lows hover around the upper 60s. Outdoor workers, hikers, and athletes should hydrate frequently, limit time in direct sun, and avoid strenuous activity during peak afternoon hours. Pets and children should never be left in vehicles, even briefly.
Local impacts extend beyond Boise. Meridian, Nampa, and Caldwell will also face triple-digit heat Sunday, while rural stretches of I-84 could see reduced visibility from lingering wildfire smoke. By Tuesday evening, the return of clouds and scattered storms may bring slick roads and brief downpours.
Residents should prepare for shifting conditions and monitor updates as additional advisories are possible through midweek.
Five Day Forecast for Boise, Idaho
- Sunday: Hot, sunny, high near 96. Low around 69.
- Monday: Mostly sunny, high near 93. Low around 67.
- Tuesday: 30% chance of showers and storms, high near 91. Low near 67.
- Wednesday: 40% chance of showers and storms, high near 85. Low near 63.
- Thursday: 20% chance of showers, high near 85. Low near 63.
