textproduct: Pocatello

KEY MESSAGES

- Favorable Saturday and Most of Sunday: Low-level southerly flow will boost valley temperatures into the lower 80s today and on Sunday. Rain chances hold off until late Sunday evening and overnight, keeping the vast majority of Sunday daylight hours dry.

- Lighter Rain Totals & Late Holiday Clearing: Storm-total precipitation has trended lower down to 0.10"0.30". Morning rain and cloud cover on Labor Day Monday will clear by early- to-mid afternoon, leaving cool conditions (highs in the 60s and lower 70s) for late afternoon and evening outdoor plans.

- Chilly Monday Night: Post-frontal clearing and cold advection will drop Monday night/Tuesday morning lows into the 30s across high country basins and 40s on valley floors.

- Mid-Week Warm-Up: Temperatures recover back toward seasonal norms in the upper 70s and lower 80s Wednesday and Thursday before the next Pacific Northwest system approaches late week.

DISCUSSION

Issued at 240 AM MDT Sat Sep 5 2026

Persistent cloud cover and light rain continue across the Central Mountains this morning as the eastern edge of a Pacific Northwest low channels moisture overhead. High-resolution convective-allowing models (CAMs) indicate this activity will briefly wane late this morning through the afternoon, offering a short dry window. While isolated showers may redevelop late tonight across the Central Mountains, the rest of eastern Idaho will remain dry. Afternoon maximum temperatures will reach the lower 80s across the lower Snake Plain and Magic Valley, with mountain zones holding in the mid-to-upper 70s.

Low-level southerly flow will strengthen on Sunday ahead of the approaching upper-level low. Guidance continues to trend storm- total precipitation lower (0.10" to 0.30") while delaying rain chances until late Sunday evening and overnight. Consequently, the vast majority of eastern Idaho will enjoy dry daylight hours on Sunday, with valley temperatures warming back into the lower 80s.

Early morning rain showers and cloud cover on Monday will clear out from west to east during the early-to-mid afternoon, with precipitation ending well before sunset. This timing allows the second half of the holiday to remain usable for outdoor festivities, albeit in a seasonably cool environment with highs in the 60s and lower 70s. Clearing skies Monday night will drive overnight lows into the 30s across high country basins and 40s in valley floors.

Tuesday remains cool with lower-elevation highs in the lower-to- mid 70s and mountain highs in the 60s. Flow turns predominantly zonal Wednesday and Thursday, pushing valley temperatures back toward seasonal averages in the upper 70s and lower 80s under generally dry conditions. Model guidance indicates another Pacific Northwest trough digging south Friday into next weekend, which could lower temperatures slightly while increasing cloud cover and low-end precipitation chances.

AVIATION /12Z TAFS THROUGH 12Z SUNDAY/

Issued at 547 AM MDT Sat Sep 5 2026

VFR conditions expected throughout the period regionwide once again. KSUN will likely be the only terminal to see any clouds with a low chance for a stray shower. Winds will be around 10 kts or less for all east Idaho terminals today.

FIRE WEATHER

Issued at 240 AM MDT Sat Sep 5 2026

Widespread critical fire weather conditions are not expected over the next several days due to seasonable temperatures, high overnight recoveries, and incoming light wetting rains. Light rain over the Central Mountains clears briefly this afternoon before isolated mountain showers return overnight. Strengthening southerly breezes on Sunday afternoon will precede a late-night moisture push, delivering 0.10" to 0.30" of cumulative wetting rain through Monday morning. Seasonably cool temperatures Monday and Tuesday will keep active fire behavior suppressed before a warming trend returns mid-week.

PIH WATCHES/WARNINGS/ADVISORIES

None.