Extreme Heat Wave Forecast to Shatter Records Across Western US

Temperatures up to 30 degrees above normal expected, raising risks of heat-related illnesses

Mar. 16, 2026 at 4:51pm

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Meteorologists are warning of an unusually early and prolonged heat wave that is forecast to bring record-breaking temperatures to much of the western United States this week. The National Weather Service has issued extreme heat warnings and advisories for several states, with some areas expected to see temperatures climb well into the 90s and even reach triple digits - conditions more typical of mid-summer than mid-March.

Why it matters

The early arrival and extended duration of this heat wave raises concerns about heat-related illnesses, especially for vulnerable populations like the elderly, young children, and those without access to air conditioning. The unseasonably warm temperatures will also accelerate snowmelt, leading to swelling rivers and faster currents that pose risks to anyone entering the still-cold water.

The details

Forecast maps show that daytime highs are expected to run 20 to 30 degrees above typical levels for this time of year, with many locations likely to set both all-time high temperature records for the month of March as well as their earliest 100-degree readings on record. Los Angeles could reach 98°F on Wednesday, while Phoenix may hit 101°F on Wednesday and 104°F on Thursday.

  • The extreme heat is expected to peak from Tuesday through Friday this week.
  • An extreme heat warning is in place for southwestern California, including Los Angeles, until 8 p.m. local time on Friday.

The players

National Weather Service (NWS)

The federal agency responsible for weather forecasting and issuing weather-related warnings and advisories.

Weather Prediction Center (WPC)

A division of the National Weather Service that specializes in medium-range weather forecasting.

AccuWeather

A commercial weather forecasting company that provides weather data and analysis.

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What they’re saying

“Dozens of daily high temperature records are expected, and many locations are likely to set both all-time high temperatures for the month of March and their earliest 100-degree temperature on record.”

— Weather Prediction Center

“There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors.”

— National Weather Service Los Angeles

What’s next

The National Weather Service has advised residents to adjust plans to limit strenuous outdoor activities between 10 a.m. and 8 p.m., seek air conditioning, keep hydrated, and check in on loved ones and neighbors.

The takeaway

This extreme and unseasonable heat wave underscores the growing threat of climate change, as weather patterns become more erratic and intense. It serves as a stark reminder of the importance of preparedness, community support, and long-term solutions to address the impacts of a warming planet.