I-15 Weather Conditions and Forecasts

2026-09-10 Roadnow

I-15 Tuesday Night 2026-09-15 weather conditions

• detailI-15 Montana: Partly Cloudy, 45°F
• detailI-15 Idaho: Partly Cloudy, 44°F
• detailI-15 Utah: Partly Cloudy, 51°F
• detailI-15 Arizona: Mostly Clear, 77°F
• detailI-15 Nevada: Mostly Clear, 78°F
• detailI-15 California: Clear, 66°F

I-15 7 day weather forecast