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An unusually early heatwave has set new high-temperature records across the United States. The extreme heat arrived much sooner than expected this spring. On Thursday, the community of Martinez Lake in Arizona reached 110 degrees Fahrenheit. This temperature sets a new record for the highest March temperature in the entire country. Usually, such extreme heat does not happen until late spring or summer. However, record-breaking temperatures arrived much earlier this year.
Many other cities broke all-time March temperature records on Wednesday, March 18, 2026. In Indio, California, the temperature hit 107 degrees Fahrenheit. Palm Springs, California, reached 105 degrees Fahrenheit. Phoenix, Arizona, saw 102 degrees Fahrenheit. Even places with high elevations like Reno and Flagstaff saw warmer than usual temperatures. These places are usually cooler because of their high ground. But the heatwave has overcome the usual cooling effect.
For Phoenix, this marks the earliest 100-degree day since records began. Normally, Phoenix expects its highest April temperatures to reach 105 degrees. However, the city tied that all-time April record back in March. On Thursday, Phoenix hit 105 degrees. Scientists expect more cities to break records in the coming days. The heat is persistent, and weather systems are moving faster than typical seasonal norms.
An early spring heatwave is bringing record temperatures to much of the United States. A strong ridge of high pressure has centered over the American Southwest. This ridge pushes temperatures up significantly in the region. Temperatures have hit 100 degrees Fahrenheit across the area. Across California and the desert Southwest, temperatures will be 20 to 30 degrees warmer than normal. This large ridge acts like a blanket. It traps hot air near the ground. It also prevents cooler air from moving in.
The heatwave is expanding eastward toward the Rocky Mountains and the Great Plains. Record-high temperatures will continue all the way through Sunday. The triple-digit heat may finally ease by early next week. However, forecasts call for temperatures to stay above average for the next week and a half. This warming trend will not just affect the southwestern United States. It will touch most of the country. The influence of this high-pressure system is broad.
The Climate Prediction Center has outlined a majority of the United States for warmer-than-average temperatures through March 27, 2026. It is important to understand this does not mean every location will break records. Instead, it means temperatures have a better chance of being warmer than normal. This forecast helps meteorologists and communities prepare for potential risks. They can plan for prolonged heat before it arrives.
Heat advisories are normally associated with the summer months. However, local weather offices issue them whenever heat is dangerous. Many areas of the southwestern United States are currently under an Extreme Heat Warning. This warning means meteorologists expect dangerous heat or that it is already occurring. Officials issue these warnings to alert the public. They want people to take immediate action to avoid injury.
During an Extreme Heat Warning, do not go outside during the hottest part of the day. If you cannot avoid being outside, stay well-hydrated with water. Take frequent breaks in the shade. Find air-conditioning as often as possible to lower your body temperature. The sun is most intense between 10 a.m. and 4 p.m. This is the most dangerous time to be exposed.
When hot weather is on the way, you may receive an Extreme Heat Watch. This means dangerous heat is possible but has not arrived yet. The National Weather Service issues these watches so people can prepare. Steps to take include having a backup plan for outdoor activities. Find the closest cooling center. Check in on family and friends to ensure they are safe.
Staying safe in extreme heat depends on your situation. The main idea is to avoid the heat as much as possible. If you can stay inside in air-conditioning, this is your best option. But if you cannot avoid the hot weather, there are specific things to do. Take frequent breaks in the shade. Make sure you are staying hydrated. Wear light-colored, loose-fitting clothing. Pay close attention to how you are feeling. Your body sends signals when it is struggling to regulate its temperature.
If you or someone you are with is sweating heavily, you might have heat exhaustion. Other signs include feeling weak, tired, dizzy, or nauseated. You must immediately move yourself or the person into air-conditioning. Loosen their clothing. Give them sips of cool water. Put cold compresses on their body to help lower the temperature. Acting quickly can prevent this from worsening into something life-threatening.
If someone is acting confused or slurring their speech, this is likely heat stroke. They need medical attention immediately. Call 911. While you wait for help, move the person to air-conditioning. Add cool compresses to lower their temperature. Do not give them anything to drink until medical professionals arrive. Heat stroke is a medical emergency. It can cause permanent damage or death if not treated instantly.
The heat can be more dangerous to young children and older adults. People with chronic medical conditions and pregnant women are also at risk. Unhoused people and lower-income communities face significant risks too. They may not be able to afford running their air-conditioning. Check on your friends, family, and neighbors before, during, and after these events. Communities working together can save lives during intense weather.
An early season heatwave has spread across a wide swath of the country. Many all-time high temperature records for March have fallen. As the season progresses, it remains to be seen exactly how hot temperatures will get. The potential for continued record-breaking weather is high. This event serves as a reminder of how weather patterns can shift dramatically. They can quickly impact daily life across the nation.