I-15 Weather Conditions and Forecasts

2026-09-10 Roadnow

I-15 Saturday Night 2026-09-12 weather conditions

• detailI-15 Montana: Chance Showers, 63°F
• detailI-15 Idaho: Mostly Cloudy, 74°F
• detailI-15 Utah: Partly Cloudy, 85°F
• detailI-15 Arizona: Mostly Clear and Breezy, 98°F
• detailI-15 Nevada: Clear and Breezy, 98°F
• detailI-15 California: Mostly Clear, 89°F

I-15 7 day weather forecast