Ashton, ID 83445 Weather

Key messages

- Light to moderate rain with very high elevation snow today and tonight.

- A slight tapering off Saturday, then moderate to heavy rain and light snow in the mountains Saturday afternoon through Sunday night/Monday morning.

Discussion

Issued at 216 AM MDT Fri Oct 30 2026

Low pressure along the OR-WA coast will bring a deep south southwesterly flow that will dredge up some subtropical moisture and bring it far enough northward to bring showers to the western parts of the forecast area, spreading eastward during the afternoon and through the overnight. The low itself splits with part of it moving inlands into central OR by Sun morning. On Sat night moderate to heavy precipitation develops over the southern portions of the Gem State, including high elevation snow in the central Idaho mountains. Very little snow develops outside of the central Idaho mountains, so the snow level will lower to around 7000ft elevation. Rain and snow continues at lower rates for Sun night.

The southerly airflow does bring in mild air and overcomes the cloud cover to produce a solid warm up into the lower 60s for the heavily populated Snake River corridor. However, the continued thick cloud cover for Sun means much cooler temperatures for the afternoon, about as cold as the previous Thu. As the cold air moves in behind the low on Sun the temperatures cool more, barely reaching the 50 degree mark in lower elevations even along the southern border.

Not too much wind to speak of with this low, but some breezy to windy conditions possible in south central Idaho on Sun/Sun night.

Aviation

Issued at 1059 PM MDT Thu Oct 29 2026

VFR conditions with generally light winds through most of the period. The exception to this is the introduction of MVFR CIGs at KSUN beginning 23z Friday. High-resolution models continue to indicate VCSH at KBYI and KSUN between now and 09z Friday, transitioning to showers during the daytime. VCSH look to hold off elsewhere until after 00z Saturday.

Fire weather

Issued at 216 AM MDT Fri Oct 30 2026

Rain and high elevation snow can be expected starting today and continuing, off and on, through Sun night/Mon morning. Very high humidity with only occasionally breezy to windy conditions expected as the low crosses through the western states during this period, tracking south of Idaho for its center. Temperatures peak today, with some low elevations reaching to around 60 degrees, but cooling for Sat and even more cooling Sun. Some snow is possible at elevations down to around 7000ft or so.

Watches, warnings and advisories

None.