Steady Pacific Rain Targets Boise as Treasure Valley Heads Into a Mild but Wet December Weekend
BOISE, IDAHO — Calm skies and a crisp morning chill are giving way to thicker clouds across southern Idaho as a Pacific storm system pushes inland. By midday, gray skies will take over the Treasure Valley, and by afternoon, steady rain showers are expected to fill in across the Boise metro area. Highs will reach only around 43°F, with a damp, raw feel and a persistent light southeast wind.
Steady Rain Builds Through This Afternoon, Making Roads Slick on I-84
Meteorologists expect rain to intensify late today and continue through Friday morning, with as much as ½ inch of accumulation possible across valley locations. Roads will become slick through the afternoon and evening commute, particularly along:
- I-84 between Nampa and Mountain Home
- Urban corridors in downtown Boise
- Low-visibility stretches near the foothills
Temperatures will remain too warm for snow in the city, but mountain elevations above 5,000 feet could briefly mix with wet snowflakes.
Gray and Soggy Friday Before Weekend Warm-Up Near 50°F
Friday stays gray, mild, and wet, with highs near 46°F and lingering rain tapering late in the day. The atmosphere remains unsettled into Saturday, though the storm system begins to weaken, leaving scattered showers and highs near 50°F.
Despite the moisture, no significant mountain snow is expected this weekend due to warmer air flowing in behind the storm.
More Rain Likely Early Next Week as Mild Pattern Continues
Another weak disturbance is forecast to arrive early next week, keeping Boise locked in a mild, wet December stretch. Highs will push into the 50s, and daytime conditions will remain cloudy with periodic rain through at least midweek.
This pattern is typical for early winter in southern Idaho when Pacific moisture dominates and colder air stays bottled up to the north.
Five-Day Forecast for the Treasure Valley
Friday: Rain tapering late, high 46°F, low 39°F
Saturday: 30% rain chance, high 50°F, low 33°F
Sunday: Mostly cloudy, high 49°F, low 38°F
Monday: 40% rain chance, high 52°F, low 40°F
Tuesday: 40% rain chance, high 59°F
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