Idaho – Headlights glow through a gray veil this morning as fog settles into low spots across the Treasure Valley. The air feels damp and cold, and visibility drops quickly near river corridors and open fields. Winter hazards are subtle but active early.
According to the National Weather Service in Boise, patchy fog will affect the area through late morning, especially before midday. Temperatures hover near 30 degrees early, allowing fog to cling to roads and bridges. While widespread ice is not expected, slick patches can form where moisture freezes.
In Boise, today turns mostly cloudy after fog lifts, with highs reaching the mid-40s. Calm winds keep conditions quiet, but shaded streets may stay damp. Tonight cools into the low 30s, setting the stage for fog redevelopment by early Friday. Drivers should slow down during the morning commute and allow extra stopping distance.
Friday brings a similar pattern. Patchy fog lingers early, then clouds thin as temperatures climb toward the mid-40s again. Saturday marks a noticeable shift. Afternoon highs rise into the mid-40s, then near 50 by Sunday. That warmth melts lingering frost and light snowpack during the day, but refreezing remains possible after sunset.
Sunday stays mostly cloudy and mild, offering one of the warmer days of the stretch. Nighttime lows still dip into the low 30s, keeping the freeze risk alive for sidewalks and parking lots. Early next week remains quiet, with seasonable temperatures and fewer fog concerns.
This is classic late-January weather for southwest Idaho. Conditions feel calm, but timing matters. Morning fog and evening refreezing create brief travel risks that are easy to overlook.
Seeing fog or slick spots where you live this morning? Let us know what conditions look like.
Five Day Outlook for Boise, Idaho
Today: Patchy morning fog, mostly cloudy, high near 45
Friday: Patchy fog early, mostly cloudy, high near 46
Saturday: Areas of fog early, mostly cloudy, high near 46
Sunday: Mostly cloudy, milder, high near 50
Monday: Mostly sunny, seasonable, high near 48
