I-15 California Road Conditions

I-15 crosses 287 miles of California, from the Nevada line to its end in the state. That is 20% of I-15's 1,433 miles.

Inside California it meets I-40 at Barstow, and I-10.

By mile marker, I-15 passes San Diego 0 (5 mi off) · Barstow 175.

It carries Cajon Pass at 3,777 ft, where the weather at the summit is not the weather on the approach.

No full closures are reported on I-15 in California as of Sep 14, 2026 6:31 PM PDT, and no lane closures or roadworks either. Always check with the responsible state DOT before setting off.

NOAA 1991–2020 Climate Normals, from a weather station in California. A dash is a figure that station does not report, not a zero.

Every figure above is a town or a city. The summits are a different climate: Cajon Pass, Donner Pass (Donner Summit, I-80), The Grapevine (Tejon Pass, I-5) have its own page with the readings at the top and a six-day summit forecast.

Towns Along I-15 in California

From San Diego to Barstow, with the position of each town measured along this stretch itself — counted from the San Diego end, not from a state milepost, so it will not match the numbers on the signs.

1. 3 mi San Diego 1.2 mi off the road
2. 26 mi Escondido 1.8 mi off the road
3. 26 mi San Marcos 3.7 mi off the road
4. 59 mi Murrieta 1.0 mi off the road
5. 68 mi Canyon Lake 2.7 mi off the road
6. 89 mi Corona 1.3 mi off the road
7. 93 mi Norco
8. 99 mi Jurupa Valley 4.7 mi off the road
9. 106 mi Rancho Cucamonga 2.5 mi off the road
10. 136 mi Hesperia 4.2 mi off the road
11. 143 mi Victorville 2.0 mi off the road
12. 174 mi Barstow 1.3 mi off the road

Places from the US Census Gazetteer and population estimates, both public domain; distances measured along this page's own route geometry.

Related Roads

I-15 in California Road Weather FAQ

Is Interstate 15 in California closed right now?

No full closures are reported on I-15 in California. No lane closures or roadworks are reported either.

What are I-15 in California road conditions today?

The map on this page colors the route along I-15 in California by what is on the pavement right now — dry, wet, slush, snow or ice — from radar and surface data, last updated Sep 14, 2026 6:31 PM PDT. Right now temperatures run from 73°F to 99°F and the strongest wind is 17 mph.

Are there mountain passes on I-15 in California?

Yes — one on this site, Cajon Pass at 3,777 ft. Each has its own summit page.

Are there live traffic cameras on I-15 in California?

Yes. This page shows 6 live views on I-15 in California from the state transportation departments' own camera feeds, further down the page, refreshed each time you load it.

How often are I-15 in California road conditions updated?

The road surface and weather layers are rebuilt whenever this page is opened with data more than ten minutes old, and refreshed on a schedule in between, so nothing here is more than about two hours old even on a road nobody has looked at. Closures and road blocks are re-imported from the state 511 feeds every fifteen minutes, and the written state-by-state summaries are refreshed daily. Every section on this page carries the time its data was fetched.