I-8 · CA
I-8 over Mountain Springs (In-Ko-Pah): road conditions right now
San Diego, CA to El Centro, CA
I-8 leaves San Diego, crosses the mountains of eastern San Diego County past Jacumba, then descends the Mountain Springs grade past In-Ko-Pah into Imperial County and the Imperial Valley at El Centro. It is the main road between San Diego and the desert Southwest.
Conditions at Mon, 12:02 AM PST
Highest risk along I-8: 1 of 5 (low), departing at that time.
- No active NWS alerts on this route.
The road authority linked below has the final word on closures and chain requirements.
Clear driving for the whole 1 h 44 min.
Conditions: Clear, Clear with periodic clouds
Checkpoints along I-8
| Where | You pass | Weather | Risk | Why |
|---|---|---|---|---|
| San Diego, CA | Mon 1:00 AM | 59°F | low | Sources differ: NWS says Slight Chance Rain Showers at 60°F |
| Alpine, CA | Mon 1:30 AM | 49°F | low | Nothing flagged |
| Campo, CA | Mon 2:00 AM | 46°F | low | Nothing flagged |
| Seeley, CA | Mon 2:30 AM | 60°F | low | Nothing flagged |
| El Centro, CA | Mon 2:44 AM | 58°F | low | Nothing flagged |
Why this stretch is hard in winter
- Caltrans keeps wind fencing along eastbound I-8 near In-Ko-Pah Park Road, and replaced a damaged section in 2025.
- The route spans two NWS offices: San Diego forecasts the mountains on the west side, and Phoenix forecasts Imperial County and the descent into El Centro.
- Caltrans chain controls (R-1, R-2, R-3) apply wherever they are posted in California, including on I-8 when a winter storm brings snow to the mountains east of San Diego.
What this page checks
- Hourly forecast at every checkpoint for the time you would be there: temperature, precipitation type and rate, gusts, visibility.
- Active National Weather Service watches, warnings, and advisories on the route.
- Snow on the ground (NOAA SNODAS) and the Weather Prediction Center winter impact outlook.
- Pavement temperature and surface state from state DOT road sensors, when you are leaving within a few hours.
- Chain controls, closures, and winter road condition reports from state DOT feeds where they are published openly.
- Seasonal closures of mountain roads the router might otherwise use.
Official sources for this corridor
Questions drivers ask about I-8
- Which weather office covers I-8 between San Diego and El Centro?
- NWS San Diego covers the San Diego County mountains, and NWS Phoenix covers Imperial County, including the lower Mountain Springs grade and El Centro. This page shows active alerts from both along the route.
- Do I need chains on I-8?
- Only when Caltrans posts chain controls. Then R-1, R-2 or R-3 rules apply, the same as on other California mountain roads. Check QuickMap before you leave.
Conditions change by the hour. This page is a planning aid built on public forecasts and DOT feeds; the road authority linked above has the final word on closures and chain requirements.
Other corridors: I-80 across Wyoming · I-70 through the Colorado mountains · I-80 over Donner Pass · I-90 over Snoqualmie Pass · I-84 through the Blue Mountains · I-15 over Cajon Pass · all corridors