I-15 Weather Conditions and Forecasts

2026-08-16 Roadnow

I-15 Thursday Night 2026-08-20 weather conditions

• detailI-15 Montana: Partly Cloudy, 55°F
• detailI-15 Idaho: Partly Cloudy, 57°F
• detailI-15 Utah: Partly Cloudy, 67°F
• detailI-15 Arizona: Mostly Clear, 85°F
• detailI-15 Nevada: Slight Chance T-storms, 88°F
• detailI-15 California: Mostly Clear, 71°F

I-15 7 day weather forecast