I-15 Weather Conditions and Forecasts

2025-09-13 Roadnow

I-15 Thursday Night 2025-09-18 weather conditions

• detailI-15 Montana: Slight Chance Showers, 49°F
• detailI-15 Idaho: Mostly Clear, 46°F
• detailI-15 Utah: Partly Cloudy, 53°F
• detailI-15 Arizona: Isolated Showers, 71°F
• detailI-15 Nevada: Scattered Showers, 76°F
• detailI-15 California: Slight Chance T-storms, 69°F

I-15 7 day weather forecast