Idaho – Boise wakes to a damp chill this morning as steady rain slicks rooftops and glistens across wet pavement. The sound of light drizzle tapping windshields mixes with faint valley fog—an unmistakable sign of early December weather settling into the Treasure Valley. Commuters should expect reduced visibility at intersections and slippery conditions on I-84 and surface streets through midday.
According to the National Weather Service, rain continues across southwestern Idaho today with highs near 45°F. Periods of light to moderate rain will persist through the afternoon before tapering this evening. Rainfall amounts could reach a quarter to half an inch, enough to saturate ground already soaked from this week’s showers.
As skies begin to clear Saturday, temperatures climb to around 50°F under partly sunny skies. While roads will dry, moisture trapped near the surface could produce patchy fog late Saturday night into Sunday morning—especially along the Boise River and lower valley roads. Drivers heading toward Nampa or Meridian should allow extra travel time early Sunday.
Sunday itself looks quieter, with highs near 48°F and only a 30–50% chance of scattered showers by evening. Any rain that develops will be light, but cooler air sliding in overnight could lead to thin frost in sheltered areas.
Monday and Tuesday return to a mild, unsettled pattern with more cloud cover and a renewed chance of rain. Meteorologists say long-range models hint at a possible cold shift after December 11, which could bring snow back into the high desert mix as holiday travel ramps up across Idaho and the Northwest.
Five-Day Outlook for Boise, ID
Today: Rain, high 45°F.
Saturday: Partly sunny, 50°F.
Sunday: Chance of rain, 48°F.
Monday: Patchy fog, 52°F.
Tuesday: Chance of rain, 53°F.
