First Alert Forecast September 3, 2020 5:25 am First Alert Forecast: Easing Into Excessive Heat Temperatures are climbing, reaching triple digits by the weekend. Belen De Leon has the forecast for Thursday Sept. 3, 2020. US & World Videos 3:18 First Alert Forecast: Breezy Sunday 3:31 First Alert Forecast: Mostly Cloudy Saturday 3:12 First Alert Forecast: Rain this weekend 3:46 First Alert Forecast: Weekend Sprinkle Chance 3:47 First Alert Forecast: Morning Clouds & Fog