Utah December Weather Today: Strong Winds Impact I-80, I-15 Travel

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Utah starts the morning under thick clouds as wind sweeps through the Salt Lake Valley. Flags snap. Tree branches sway. Loose decorations shift before many people head out the door.

According to the National Weather Service in Salt Lake City, a Wind Advisory remains in effect today from late morning through early evening. West winds strengthen quickly, reaching 20 to 30 mph, with gusts up to 55 mph in valley locations. Stronger gusts near 60 mph are possible along the Wasatch Mountains and exposed benches.

Travel impacts are likely, especially for high-profile vehicles. Drivers on I-15, I-80, and north–south routes may encounter sudden crosswinds by midday. Semi-trucks, trailers, and RVs face the greatest risk. Plan extra time and keep both hands firmly on the wheel.

Gusty winds may also knock around unsecured holiday decorations and trash bins. Isolated power outages remain possible. Residents are urged to secure loose outdoor items early and avoid unnecessary travel during peak wind hours.

Rain showers develop later today, adding slick pavement to the mix. Visibility may drop briefly during heavier bursts. Conditions improve slowly this evening as winds ease, though scattered showers may linger overnight.

Thursday brings a calmer pattern. Winds relax, and temperatures cool into the upper 40s. A rain-and-snow mix remains possible during the day, though little accumulation is expected in the valley. Mountain roads could turn slick at times.

By Friday, attention shifts toward Christmas travel. Periods of rain are possible, with snow returning to higher elevations. Travelers heading into the Wasatch Mountains should monitor conditions closely and prepare for changing road conditions.

This active stretch marks Utah’s deeper move into winter mode. Wind today sets the stage, followed by unsettled weather through the weekend.

Five-Day Outlook (Salt Lake City, UT):
• Today: Windy, showers, high near 57
• Thursday: Chance rain/snow, high near 49
• Friday: Rain likely, high near 57
• Saturday: Rain, high near 51
• Sunday: Chance rain, high near 54