Executive summary
Wildfire risk in the Los Angeles area reached critical levels in 2025 as extreme heat, dry conditions and strong winds combined to create highly dangerous fire weather. World Weather Attribution analysis finds that human-caused climate change increased the likelihood of the weather conditions that led to wildfire disaster. The study highlights how climate-driven hazard intensification and very high exposure in the wildland–urban interface combine to produce severe and escalating risk.
What happened
In 2025, the Los Angeles region experienced periods of extreme fire weather characterised by high temperatures, low humidity and strong winds. These conditions dried vegetation and enabled fires to ignite and spread rapidly across hillsides and into densely populated areas.
Wildfires threatened homes, critical infrastructure and transport corridors, prompting evacuations and causing widespread disruption. Smoke and poor air quality affected large populations, creating additional health impacts beyond the burn areas themselves.
What the attribution analysis found
World Weather Attribution finds that climate change increased the likelihood of the hot, dry conditions that drove the wildfire disaster. Rising temperatures increased evaporation and reduced fuel moisture, creating landscapes more susceptible to ignition and rapid fire spread.
The analysis shows that similar fire-conducive weather conditions would have been significantly less likely in a pre-industrial climate. In today’s climate, these conditions occur more frequently, increasing the probability of large and destructive wildfires.
While climate change does not determine ignition sources, it strongly influences fire behaviour once fires begin.
Exposure in the wildland–urban interface
A key finding of the study is the role of exposure. The Los Angeles area contains extensive development in the wildland–urban interface, where homes and infrastructure are closely interwoven with fire-prone vegetation.
High population density, valuable assets and complex evacuation routes significantly increase potential losses when fires occur. As climate change intensifies fire weather, this exposure amplifies impacts even further.
How climate attribution fits into wildfire risk reporting
Climate attribution helps clarify why wildfire disasters are becoming more severe even where fire management practices have improved. By showing that climate change is increasing the frequency of fire-conducive weather, attribution supports a reassessment of wildfire risk beyond historical fire records.
For wildfire-prone regions, this means that past fire experience increasingly underestimates future risk.
Why this matters for organisations
For local authorities, utilities, insurers, real estate developers and businesses operating in the Los Angeles area, the findings highlight growing exposure to wildfire-related disruption and loss. Power outages, supply chain disruption, property damage and health impacts are likely to increase as extreme fire weather becomes more frequent.
How to use this in your own risk work
Organisations should integrate climate-adjusted fire weather scenarios into wildfire risk assessments, review asset exposure in wildland–urban interface zones and strengthen business continuity and evacuation planning. Reducing fuel loads, improving building resilience and managing development in high-risk areas will be critical to limiting future wildfire impacts.
Source
World Weather Attribution (2025). Climate change increased the likelihood of wildfire disaster in the highly exposed Los Angeles area.