Boise, Idaho – Summer heat will surge across southern Idaho Wednesday as temperatures in Boise climb to 91°F, with little relief in sight. Dry air and light winds are creating ideal conditions for sun exposure, vehicle overheating, and even wildfire ignition along high-use corridors like I-84 and Highway 21.
According to the National Weather Service in Boise, Wednesday marks the start of a multi-day hot spell. Daytime highs will sit in the low 90s through Friday, with overnight lows barely dipping below 60°F. Light and variable wind Wednesday will shift northwest at 5 mph by evening, keeping the region dry and stagnant.
Boise residents should limit strenuous outdoor activity between noon and 6 p.m. Hydrate frequently, wear sun protection, and avoid leaving pets or electronics in vehicles. Employers with outdoor workers should follow OSHA guidelines to prevent heat-related illness…