Heat risk
Today's heat-health risk and 7-day outlook by ZIP (CalEPA CalHeatScore), the local forecast high (National Weather Service), and which areas are most vulnerable to heat (CDC Heat & Health Index).
How it works
Climate risk, made clear.
HeatGridLA turns complex climate information into a quick neighborhood view and connects residents with practical help.
What is land surface temperature?
Land surface temperature, or LST, is the temperature of streets, roofs, soil, and other surfaces measured from above. It helps show where built-up areas absorb 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, taken in late morning — afternoons run hotter still. We pair it with tree cover and paved-area figures to explain why one neighborhood may feel hotter than another.
What the map brings together
Wildfire hazard
CAL FIRE Fire Hazard Severity Zones — where brush, slope, 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 is designed for quick decisions during heat or wildfire events, and can also help planners spot neighborhoods with fewer cooling and shade options.
About the data
Heat and wildfire information comes from public sources: CalEPA CalHeatScore (updated daily), the National Weather Service forecast, the CDC Heat & Health Index (2024), CAL FIRE Fire Hazard Severity Zones (2024–2025 maps), USGS Landsat surface temperature (summer 2025), 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 observed CDC national percentiles: Low is 50% or below, Moderate is above 50% through 75%, and High is above 75%. These are HeatGridLA groupings of CDC bands, not official CDC tier names. Missing ZIPs are unrated, never assigned a neighboring ZIP’s values. Fire zones and community-risk polygons are clipped to the official Los Angeles County outline.
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Emergency contacts
Enter your ZIP or city to see your local fire and power lines.