Boise, Idaho – Drivers in southwestern Idaho should brace for slick commutes and storm delays Monday evening as thunderstorms develop across the Treasure Valley. Travel along I-84 may become hazardous during heavy downpours, with the potential for localized flooding and reduced visibility. Residents are urged to limit non-essential travel during the heaviest rain and keep phones charged in case of power outages.
According to the National Weather Service in Boise, rain chances begin Monday afternoon and increase into the evening, with up to 30 percent likelihood of storms. Winds will shift from calm to south-southwest around 6 mph, adding instability that could spark thunderstorms. By Tuesday, storm coverage climbs to 60 percent, with stronger cells capable of producing brief heavy rain, gusty winds, and lightning.
Temperatures, which have pushed near triple digits, will finally dip into the low 80s by Wednesday as clouds and showers linger. The break in heat offers relief, but unsettled skies will keep conditions damp through midweek. Afternoon thunderstorms remain possible Wednesday and Thursday, keeping roads wet and outdoor plans disrupted.
Travelers should allow extra time, use headlights during rain, and avoid low-lying underpasses where water can pool quickly. Outdoor activities may be interrupted, and those in rural areas should prepare for brief power disruptions.
More showers are expected into Thursday, before drier conditions return by Friday and Saturday with highs in the mid-80s. Weather alerts may be extended if storms linger.
Five Day Forecast for Boise, Idaho
- Monday: High 91°F. Patchy smoke early, then storms possible after 3 p.m. Chance of rain 20%.
- Tuesday: High 90°F. Storms likely, chance of rain 60%. Cooler overnight at 66°F.
- Wednesday: High 83°F. Showers and thunderstorms likely, 60% chance.
- Thursday: High 86°F. Chance of showers, partly cloudy.
- Friday: High 86°F. Mostly clear, calmer conditions.
