Authorities in Iran ordered government offices and banks across much of the country to close Wednesday as surging summer temperatures and a worsening water crisis strain the power grid.

A big heat dome over the southwestern U.S. will keep Colorado in a sizzling hot summer pattern through the end of the week.

Fires in California, Arizona, Utah and Nevada are growing fast in brutal heat. The Dragon Bravo Fire has topped 110,000 acres ...

An ocean-borne storm you may never glimpse could still wreck beach plans from the Outer Banks to Cape Cod, and it marks only ...