Crews reported that marine air pushed into the mountains overnight, raising relative humidity. The update at 95% containment described patrols, work on remaining hot spots and repairs to roads used in suppression.
Incident record
| Reported start | 1 June 2026 |
|---|---|
| Location in the incident record | Tijuana River, Marron Valley |
| County listing | San Diego |
| Reported footprint | 2,525 acres |
| Recorded containment | 100% |
How a marine layer changed overnight work in Marron Valley
The humidity observation offers an explanation for favorable overnight conditions. It is not a complete explanation for containment: firefighters still had to locate heat, check lines and remove equipment. The report does not quantify the separate contribution of weather and crew work.