First Alert Forecast July 20, 2021 4:22 am First Alert Weather: Some Humidity, Highs Mostly in 80s, 90s Expect some humidity with temperature high’s mostly in the 80s and 90s, with triple digits in the deserts. David Biggar has the forecast for Tuesday July 20, 2021. US & World Videos 3:07 First Alert Forecast: Patchy clouds and fog 2:59 First Alert Forecast: Windy Friday with possible showers 3:46 First Alert Forecast: Windy Friday 2:51 First Alert Forecast: Cooler weather lingers before weekend warm-up 3:49 First Alert Forecast: Cloudy & Drizzly Thursday