August will live up to its blazing hot reputation as 2026's eighth month likely sets new heat records across the Southwest and Mountain West this weekend. Triple digits will reach into the northern Rockies and the Canada border.

The TemperatureRadar shows triple digits extending across many pockets of the Southwest, Great Basin and the northern Rockies. Although places like Phoenix and Las Vegas —with highs in the mid-110s— are used to seeing hot weather like this, it will be a different story much further north.

Triple-digit highs setting new daily temperature records will be found in places like Salt Lake City, southern Idaho and throughout central and northern Montana. Every major population center in the Big Sky Country state, including Billings, Havre, Great Falls, Billings and Helena, could set new daily high records Saturday.

These extremes are 10 to 15 degrees higher than normal for this time of the year. Looking ahead to early next week, the cooler weather will set in north from Canada, bringing a whiplash of low to mid-70s to Montana while the summer heat sweeps across the central Rockies and into the western high Plains.

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