Extreme heat is heading to both coasts, bringing dangerously high temperatures to the Northeast, Northwest and Southwest.

       In the Northeast, heat alerts are in place for parts of Maine, New Hampshire, Vermont and upstate New York.

       Parts of Maine could reach record-high temperatures on Monday, with Caribou forecast to hit 95 degrees. Manchester, New Hampshire, and Burlington, Vermont, could each break daily record-high temperatures on Tuesday, potentially hitting 97 degrees and 93 degrees, respectively.

       In New York City, an air quality alert is in effect on Monday as the temperature rises. The alert is due to the hot weather trapping human-made air pollution, not wildfire smoke from Canada.

       The West is also facing extreme heat.

       In the Northwest, heat alerts are in place through Tuesday for Portland, Oregon; Seattle and Spokane, Washington. Temperatures are forecast to hit 99 degrees in Portland and Sacramento, California, and 107 degrees in Medford, Oregon.

       In the Southwest, cities including Las Vegas and Phoenix are under extreme heat warnings, with temperatures expected to climb as high as 113 or 114 degrees through Tuesday. And in Death Valley, California, the temperature could reach a scorching 122 degrees on Monday and Tuesday.

       Click here for tips to stay safe in the heat.