Eastern Idaho Clears Overnight Before Mountain Showers

Patchy fog and brief clearing develop tonight, with isolated light showers Thursday afternoon in the mountains before sunshine returns Friday.

Updated on Nov. 4, 2026 in Current Conditions

Low valley fog drifts over a sagebrush plain at dawn, with dark conifer-covered mountains rising behind under a clearing sky. — Patchy fog is forecast across eastern Idaho overnight, with a low near 30 degrees and isolated light showers expected in the Central Mountains Thursday afternoon. AI Illustration. Upload story photo >

Eastern Idaho sees brief clearing and patchy fog overnight, with tonight's low near 30 degrees and south winds of three to seven mph. An incoming disturbance brings increasing clouds and isolated light showers to the Central Mountains and Southeast Highlands Thursday afternoon.

Why it matters

Fog that forms before the Thursday morning commute can reduce visibility for drivers across the state. Mountain showers are expected to be light and isolated, while most of eastern Idaho stays dry because limited low-level moisture is in place.

Forecast figures show overnight lows near 30 to 31 degrees and daytime highs between 45 and 47 degrees through Friday. Precipitation amounts for the isolated mountain showers are not specified, and fog coverage is described only as patchy.

The details

Patchy fog develops across parts of the region after 8 p.m. tonight and lingers into Thursday morning before 9 a.m. A passing weather system brings spotty rain to high-elevation areas Thursday afternoon, followed by a high-pressure ridge that clears skies Thursday night.

Tonight, Wednesday, November 4, 2026: brief clearing and patchy fog develop after 8 p.m.
Thursday, November 5, 2026: fog present before 9 a.m. and isolated light showers in the afternoon
Thursday night, November 5, 2026: patchy fog forms between 11 p.m. and 2 a.m.
Friday, November 6, 2026: full sunshine returns with a high near 45 degrees

Seasonal Patterns

Mid-50s highs and mid-30s lows through Tuesday place eastern Idaho's early-November stretch near typical seasonal averages for the Intermountain West. Limited low-level moisture keeping most of the region dry fits a pattern in which mountain areas, not the valleys, receive the bulk of the light precipitation.

Drivers should allow extra time Thursday morning because patchy fog may reduce visibility before 9 a.m. Mountain travelers should expect isolated light showers Thursday afternoon, and overnight temperatures near freezing make early-morning roads a possible hazard.

The takeaway

Plan for cool, foggy mornings this week and check conditions before traveling into the mountains. Mild, dry weather returns Friday and is expected to hold into early next week.

What happens next

Friday's sunshine and mild temperatures are projected to continue through early next week, with highs in the mid-50s and lows in the mid-30s through Tuesday.