Millions of Americans are under weather advisories this week. See which major cities have heat, flood or storm advisories.

The peak average highs for many in the United States are hit in July or early August, but in some locations it's as early as June or as late as early fall.

CNN is tracking extreme heat conditions for Americans each day. See where the risks are greatest — and where high temperature records might be broken.

View the latest weather forecasts, maps, news and alerts on Yahoo Weather. Find local weather forecasts for Cleveland, United States throughout the world ...

Sweltering heat happens every summer, but to get close to the bar of a state's all-time hottest temperature usually takes a heat wave that's on another level.

This week is delivering the hottest temperatures of the year so far to much of the eastern United States.

A powerful Arctic blast is forecast to plunge the United States into unusually cold temperatures, with every state experiencing a chill starting from Wednesday. A map shared on Tuesday by Weather ...

The United States just witnessed its most extreme October heat Palm Springs, Calif., reached 117 degrees Tuesday as a heat wave in the western United States broke hundreds of records.