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.
Nearby cities including Meridian, Nampa, and Eagle will also face similar heat levels through Saturday. Shade and water will be key as weekend temps remain in the upper 80s to near 90°F.
Extended Five-Day Forecast:
- Thursday: High of 95°F and mostly sunny.
- Friday: Slightly cooler at 90°F, but still dry and hot.
- Saturday: Continued heat with a high near 97°F.
- Sunday: Slight chance of showers late; high near 86°F.
- Monday: 30% chance of rain and cooling trend begins — high around 80°F.
