I-15 Weather Conditions and Forecasts

2026-07-21 Roadnow

I-15 Today 2026-07-21 weather conditions

• detailI-15 Montana: Patchy Smoke, 88°F
• detailI-15 Idaho: Slight Chance T-storms, 96°F
• detailI-15 Utah: Chance T-storms, 101°F
• detailI-15 Arizona: Mostly Sunny, 104°F
• detailI-15 Nevada: Hot, 105°F
• detailI-15 California: Sunny, 96°F

I-15 7 day weather forecast