Heat risk
Today's heat risk and 7-day outlook by ZIP (CalEPA CalHeatScore). The expected highest air temperature nearby (National Weather Service). Areas where heat may pose greater health risks (CDC Heat & Health Index).
How it works
Climate risk, made clear.
HeatGridLA shows heat and wildfire risks in your neighborhood. It helps you find nearby places to get help.
What is land surface temperature?
Land surface temperature, or LST, means how hot streets, roofs, soil, and other surfaces are. Satellites measure it from above. It shows where buildings and pavement soak up and hold more heat.
It is not the same as the air temperature in a weather report. Our Surface heat layer uses USGS Landsat 8 and 9 images from clear days in summer 2025. The images were taken in late morning. Afternoons are hotter still. We also look at trees and paved ground. These help explain why one neighborhood may feel hotter than another.
What the map brings together
Wildfire hazard
CAL FIRE Fire Hazard Severity Zones show where brush, hills, and wind make fast-moving fire more likely.
Relief resources
LA County and City of LA cooling centers and water stations. Evacuation centers as they open, and local emergency numbers for your area.
Built for LA residents and caregivers
The tool helps people make quick choices during heat or wildfire events. Planners can also use it to find neighborhoods with fewer places to cool off or find shade.
About the data
Heat and wildfire information comes from public sources. Heat data comes from CalEPA CalHeatScore (updated daily), the National Weather Service forecast, and the CDC Heat & Health Index (2024). Fire data comes from CAL FIRE Fire Hazard Severity Zones (2024–2025 maps). Surface heat comes from USGS Landsat surface temperature (summer 2025). We also use LA County and City of LA relief-site lists and LA Times Mapping L.A. neighborhood boundaries. Many cooling centers open only during heat alerts and hours change — call ahead or dial 211. Always follow official emergency alerts and confirm a center is open before traveling.
Community heat risk uses CDC national percentiles. A percentile shows how an area ranks compared with ZIP areas across the country. Low is 50% or below, Moderate is above 50% through 75%, and High is above 75%. HeatGridLA groups the CDC scores under these names. They are not official CDC risk levels. ZIPs with missing data get no rating. We never give them a neighboring ZIP’s values. Fire zones and community-risk map areas stop at the official Los Angeles County outline.
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Emergency contacts
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