West Coast corridor
I-5 weather from Southern California to Washington
I-5 links dry Southern California, the Central Valley, the Siskiyou Mountains, Oregon, and western Washington. The same trip can include heat, valley fog, strong wind, heavy rain, and mountain snow.
Corridor coverage
San Diego, Los Angeles, Sacramento, Redding, Siskiyou Summit, Eugene, Portland, and Seattle
Forecast timing can differ by segment. Check current weather and official road information before committing to a long-distance departure.
Representative sections
Where weather can change along this highway
Weather risks
Conditions to compare before departure
- Southern California heat and wind
- Central Valley fog
- snow and ice near Siskiyou Summit
- persistent rain in Oregon and Washington
Winter storms can close or restrict mountain sections near the California-Oregon border. Summer heat and wildfire smoke can reduce comfort and visibility across inland sections.
Official verification
Road and weather sources
Use these sources for closures, restrictions, chain requirements, incidents, and official warnings.
Current route forecasts on this corridor
DriveWindow combines researched corridor geography with time-sensitive forecasts from representative route points. Read the route weather methodology and data-source policy.