Utah’s Summer Heat Breaks Records as Long-Term Warming Accelerates

Utah faces another weekend of extreme heat, with triple-digit temperatures expected across most of the state. This summer has already shattered records, as Salt Lake City reached 109°F on July 13 and matched its highest minimum of 82°F earlier in the week, while several other municipalities have posted new daily highs. Jon Meyer, assistant state climatologist at the Utah Climate Center, notes that while 100°F days have long occurred, the length of the season with such temperatures has expanded dramatically since the turn of the century.

Analysis of National Weather Service and National Centers for Environmental Information data shows the 2020s are the hottest summer period in at least a hundred years, with average highs 1.8°F above the 2010s and 7.2°F above the 1920s. Some attribute part of the rise to the urban heat island effect around the Salt Lake City airport, a point defended by the Weather Service as representative of the valley’s climate. Statewide, nine of the ten warmest summers on record have occurred since 2000, a pattern linked to earlier snowpack melt, drier soils and the ongoing western megadrought, according to Meyer and National Weather Service meteorologist Sam Webber. Projections from the Great Salt Lake Strike Team suggest average basin temperatures could climb another 2.5-10°F this decade, underscoring the persistence of the warming trend.