I-15 Weather Conditions and Forecasts

2025-09-14 Roadnow

I-15 Tuesday Night 2025-09-16 weather conditions

• detailI-15 Montana: Mostly Clear, 71°F
• detailI-15 Idaho: Clear, 75°F
• detailI-15 Utah: Mostly Clear, 82°F
• detailI-15 Arizona: Sunny, 89°F
• detailI-15 Nevada: Sunny, 88°F
• detailI-15 California: Mostly Clear, 91°F

I-15 7 day weather forecast