University of San Diego Climate Collaborative — San Diego Region
Map opacity 100%
UC San Diego — Scripps Institution of Oceanography
Select variables and click Build Composite Risk Map
Compare mode: click a second tract to compare with —.
— click tracts to explore
Generating PDF\u2026

Download Data

File Format
Columns
Raw source values are included, except Healthy Places Index variables (tree canopy, park access, income, education, life expectancy, pollution, &c.), which are shown on the map but omitted from download under HPI's non-commercial terms — get those from HPI directly. Percentile ranks (0–100) are computed within San Diego County and match the map and PCA.
Scope
Tracts whose centroid falls inside a selected jurisdiction are included.

Census Tract Comparison

click any parcel for category
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Compare ScenariosLeft: full heat risk · Right: change in heat exposure

How to read this

Left map — the full heat risk. How hot it gets, who is vulnerable, and how well they can cope, combined into one score. Darker red means higher risk.
Right map — the change. How heat exposure shifts from the left scenario to the right one. Blue means less exposed, red means more exposed, white means little change.
cooler · less exposedhotter · more exposed

Only heat exposure responds to the climate scenario. Who is vulnerable and their ability to cope stay at today's levels, so the right map isolates the warming signal. The scale is percentile points — a tract's countywide exposure rank, 0 to 100.

Welcome to the San Diego Heat Risk Explorer

Quick start

  1. Defaults are already selected — click Build Composite Risk Map.
  2. Click any tract to see its risk score and dominant driver.
  3. Under Map Layer, switch to Dominant Driver to see what drives risk countywide.

Or use the left panel to customize your map. Here’s what each section does:

  • Heat Exposure — pick one heat hazard to map (daytime, nighttime, humid heat, or surface temperature). They affect different places, so you compare them one at a time.
  • Population Sensitivity / Adaptive Capacity — two groups of factors that shape heat risk. Turn any on or off to include them in your map.
  • Build Composite Risk Map — combines the factors you picked into a single risk score for every census tract.
  • Map Layer — switch between the combined risk score, each group on its own, or any single factor.
  • Jurisdictions — show city, unincorporated-county, or tribal-land boundaries on the map.
  • Climate Scenario — see how risk shifts under future warming, for the year 2050 or 2080.
  • Export — save the current map as a PDF or download the data.

© 2026 Southern California Extreme Heat Research Hub & San Diego Regional Climate Collaborative. Code MIT; data & content CC BY 4.0, each source under its own terms.

User Guide