Heat stress forecast

Wet bulb globe temperature (WBGT) measures heat stress in direct sunlight using temperature, humidity, wind, sun angle and cloud cover. The heat index only covers shade.

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What the levels mean

  • LowUnder 80°FSafe for most outdoor activity.
  • Moderate80 to 84°FRisk for high-intensity activity. Take breaks and hydrate.
  • High84 to 88°FIncreased risk of heat illness. Rest often.
  • Very high88 to 90°FHeat illness likely with prolonged activity. Limit time outside.
  • ExtremeOver 90°FHeat stroke is possible. Avoid strenuous outdoor activity.
Heat stress forecast (wet bulb globe temperature) | Ryan Marando