CA Heat Score

Know your heat risk before you step outside. Daily scores, an interactive forecast map, cooling centers, and safety guidance for every California ZIP code.

CA Heat Score makes it easy to understand your daily heat risk anywhere in California. Built on publicly available data from the California Office of Environmental Health Hazard Assessment (OEHHA), this app delivers heat scores, forecasts, and safety guidance in a clean, intuitive interface.

DAILY HEAT SCORES Check the current heat score for any California ZIP code on a scale of 0 to 4. Each score comes with a clear risk label — from Low to Severe — so you know exactly what to expect before heading outside.

INTERACTIVE HEATMAP Explore an interactive map of California with color-coded heat scores for every ZIP code. Tap any area to see its heat score, current temperature, and demographics. Use the built-in date picker to view forecasted heat scores up to 7 days.

7-DAY HEAT FORECAST Plan your week with daily heat score forecasts. See how heat risk is expected to change over the next 7 days, along with forecasted high and low temperatures for each day.

LOCATION-AWARE The app detects your location and shows the heat score for your current ZIP code. Change locations at any time by searching for any California ZIP code.

HEAT SAFETY GUIDANCE Learn what each heat score level means for your health and safety. Get actionable tips for staying safe during high heat events, including advice for vulnerable populations, outdoor workers, and caregivers.

ZIP CODE DETAILS View detailed information for any ZIP code including population, age distribution, and race/ethnicity demographics — helping you understand the communities most impacted by extreme heat.

SCORE HISTORY Track heat score trends over the past week to understand how conditions have been changing in your area.

KEY FEATURES

-Heat scores for every California ZIP code (0-4 scale) -Interactive heatmap with color-coded risk levels -7-day heat score and temperature forecasts -Forecast date picker on the map -Current temperature and conditions -Location detection with ZIP code search -Heat safety guidance and tips -ZIP code demographics and population data -Score history tracking -Dynamic themed backgrounds -User location shown on map

ABOUT THE DATA All heat score data comes from publicly available sources provided by the California Office of Environmental Health Hazard Assessment (OEHHA). CA Heat Score is an independent app and is not affiliated with or endorsed by OEHHA or the official CalHeatScore program or the state of California. Weather data is provided by Open-Meteo.

Stay informed. Stay safe. Know your heat risk.