EARTH · SUMMER · US SOUTHWEST
US Southwest — heat, UV & air
The hottest corner of North America — desert heat that keeps Phoenix and Las Vegas above 40 °C for weeks, extreme UV at altitude, and monsoon dust that can swing the air-quality index in an afternoon. The table below is live: each city’s temperature and feels-like right now, today’s forecast high, the UV index on the WHO scale, and the air on the US EPA scale — every figure sourced and shown with its city’s local clock time.
Reading the table
Now is the air temperature this hour; feels like folds in humidity and wind (in humid heat it runs well above the thermometer; in dry desert heat the two sit closer). Today’s high is the forecast maximum for the calendar day. UVis the WHO UV Index — the strength of skin-damaging ultraviolet reaching the ground; it peaks around local midday, so a low morning value and a “very high” daily max are both normal on the same day. Air is the US EPA Air Quality Index, driven here by fine-particle pollution. Heat figures are measurements, not a health verdict.
Sources: Open-Meteo forecast (temperature & feels-like) · Copernicus CAMS via Open-Meteo (UV index & air quality) · free & keyless · CC BY 4.0.