The record heat wave in the US is intensifying this week, with millions of Americans facing dangerous temperatures as a powerful heat dome spreads from the Southwest and Great Plains toward the East Coast. The National Weather Service (NWS) forecasts widespread highs between 95°F and 105°F (35°C-41°C), with several cities expected to challenge daily, monthly, and even all-time temperature records. The latest heatwave comes only weeks after a severe Fourth of July heat event and is being driven by persistent high-pressure systems trapping hot air over much of the country.

Experts warn that prolonged exposure to extreme heat can significantly increase the risk of heatstroke, dehydration, cardiovascular stress, and poor air quality, particularly for children, older adults, and people with underlying health conditions.

Heat Records Continue to Fall

The record heat wave in the US has already rewritten temperature records in several western states.

Salt Lake City, Utah, recorded 109°F, surpassing its previous all-time July record of 107°F, while Billings, Montana, reached 111°F, breaking its previous record of 108°F. Meteorologists describe these temperatures as exceptionally rare, even during the peak of summer.

The heat dome responsible for these conditions continues to trap warm air over large portions of the country, preventing cooler weather from moving in.

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Northeast Braces for Peak Temperatures

While western states have already experienced record-breaking heat, the Northeast is expected to endure its hottest conditions during the middle of the week.

• Forecasts indicate temperatures could reach 103°F in New York City, while Philadelphia may climb to 107°F.
• Cities from Richmond, Virginia, to Boston, Massachusetts, are also expected to experience temperatures approaching or exceeding 100°F, putting daily heat records at risk.

Meanwhile, Phoenix and Tempe, Arizona, are forecast to remain above 110°F, with triple-digit temperatures continuing across parts of Florida, Nevada, and Texas.

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Heat Spreads Into Canada

The unusually hot weather is extending beyond the United States into Canada.

• Toronto and Ottawa are expected to approach 100.4°F (38°C), with high humidity making conditions feel even hotter.
• Canadian officials have warned that elevated temperatures may also worsen air quality, increasing health risks for vulnerable populations.
• In Montreal, wildfire smoke drifting from northern Quebec and northwestern Ontario has already turned skies yellow, highlighting the combined impacts of heat and wildfire activity.

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Storms Expected After the Heat

Meteorologists expect relief later this week as temperatures across the Northeast gradually fall into the 80s.

However, cooler conditions may arrive alongside another weather threat. Thunderstorms capable of producing heavy rainfall, strong winds, and flash flooding are forecast across parts of Wisconsin, the Mid-Atlantic, and portions of the Mountain West.

The National Weather Service has already issued flash flood warnings for areas around Salt Lake City following heavy rainfall associated with unstable atmospheric conditions.

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Staying Safe During Extreme Heat

Health experts continue to urge residents to avoid outdoor activities during the hottest parts of the day, remain hydrated, wear lightweight clothing, and seek air-conditioned spaces whenever possible.

Extreme heat remains one of the deadliest weather hazards in the United States, causing more weather-related fatalities annually than floods, hurricanes, or tornadoes, according to the National Weather Service.

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Looking Ahead

Although temperatures are expected to ease across parts of the eastern United States by the weekend, the persistent heat dome is forecast to remain over much of the Mountain West through the remainder of July. Forecasters continue monitoring conditions as the record heat wave in the US increases the likelihood of additional temperature records, deteriorating air quality, wildfire risk, and weather-related health emergencies across North America.