What to Expect
Summer in the Treasure Valley is dry and hot. Daytime high temperatures average above 90 degrees Fahrenheit in July and August, while morning lows frequently dip into the 50s. In July and August, the warmest months of the year, streaks of triple digit heat can make it dangerous for anyone to remain outside for prolonged periods – especially in direct sunlight. The Treasure Valley region also has occasional thunderstorms which can bring lightning, and dangerous straight-line winds that can damage trees and cause power outages (source: NWS: Local Climate).
The Treasure Valley region could experience more than a week of triple-digit heat, with afternoon thunderstorms generating dangerous lightning and damaging wind gusts, which could together increase wildfire risk. Summer heat is one of the leading causes of weather-related deaths and illnesses in the United States. Treasure Valley residents who remain outdoors for prolonged periods of time could suffer from dehydration, heat-related illness, or even heat stroke, which could require a hospital stay for recovery. In addition, thunderstorm lightning is incredibly dangerous; in the United States it kills 20 or more people – and injures hundreds more – each year. Athletic and outdoor music events leave many vulnerable to this natural hazard. Also common to the region, thunderstorm microbursts can generate wind gusts in excess of 60 mph; these “straight-line winds” can bring trees and large branches down onto buildings and powerlines, which can cause both substantial roof damage and power outages (source: NWS: Lightning Safety).