Idaho starts the morning under a heavy lid of gray, with cold air locked in place across the Treasure Valley. The air feels still and damp, exhaust hangs low near roadways, and the chill settles deeper into neighborhoods as winter refuses to budge.
According to the National Weather Service in Boise, an Air Stagnation Advisory remains in effect through early Friday morning for the Boise metro area. Light winds and a persistent temperature inversion are trapping pollutants near the surface, limiting air movement and keeping conditions murky. Sensitive groups may notice reduced air quality, especially during morning and evening hours.
Temperatures stay stubbornly cold through midweek. Boise tops out near 30 degrees today, then slips back into the low 20s at night. Clouds linger through Thursday, limiting daytime warming and slowing snowmelt where patchy ice remains on side streets, bridges, and shaded sidewalks. Flash freezing remains a concern after sunset as damp pavement refreezes quickly.
By Friday, partial sunshine returns and highs edge into the low 30s. Conditions improve slightly into the weekend, with more sun and highs near freezing Saturday, then climbing into the mid-30s Sunday. Roads improve, but icy patches may linger early each morning.
Residents are encouraged to limit outdoor burning, reduce vehicle idling, and check on those with respiratory conditions while the advisory remains active. Drivers should allow extra time during cold mornings, especially near the Boise Connector and residential corridors.
Looking ahead, the 6–10 day outlook suggests temperatures trending near to slightly above normal across Idaho, with increasing chances for precipitation returning late next week.
Five-Day Outlook for Boise, Idaho
Today: Mostly cloudy, high near 30.
Thursday: Mostly cloudy, high near 27.
Friday: Partly sunny, high near 31.
Saturday: Mostly sunny, high near 32.
Sunday: Partly sunny, high near 34.
