This week’s intense heat will continue to pose health risks, as temperatures are not expected to cool down at night. The National Weather Service predicts more than 90 temperature records across the U.S. will be matched or surpassed by Wednesday, with many of these being nighttime heat records. Health experts warn that high nighttime temperatures can be more harmful than sweltering daytime temperatures.

The U.S. has experienced a scorching start to summer due to a persistent heat dome anticipated to cover much of the country. Recent blistering temperatures have resulted in heat-related fatalities in New Jersey and contributed to wildfires in the West.

No Nighttime Relief from Heat

In several areas, nighttime temperatures are forecasted to remain high. Fort Lauderdale, Florida; Miami; Tampa, Florida; Galveston, Texas; and Charleston, South Carolina may not see temperatures drop below 80°F (27°C), according to the National Weather Service. Similarly, in regions like the Midwest and Northeast known for cold winters, nighttime temperatures are expected to stay above 70°F (21°C), affecting places like Fargo, North Dakota; International Falls, Minnesota; and Portland, Maine.

High Nighttime Temperatures Pose Greater Danger

Health experts emphasize that elevated nighttime temperatures present significant risks because the body lacks the opportunity to cool and recover from daytime heat. University of Georgia meteorology professor Marshall Shepherd highlights that these conditions can amplify health outcomes, particularly for the elderly and vulnerable communities.

“Just a few degrees of increased body temperature can lead to heatstroke or excessive heart strain.”

The Subtle Dangers of Continued Heat Exposure

If your body cannot cool at night, health risks may arise the next day, says Kristie Ebi, a public health and climate scientist at the University of Washington. She notes that mortality rates tend to increase by the second or third day due to the body’s inability to cool.

Proactive Measures During a Heat Wave

Early signs of heat-related issues include heavy sweating, muscle cramps, and headaches. Ebi stresses the need for proactive cooling strategies. Simple measures like entering an air-conditioned space or using a cold towel on the neck can help. Additionally, it’s crucial to check on friends and family members, especially those who are older, pregnant, or have health issues that make it challenging to cope with heat.

Ways to Cool Off Without Air Conditioning

Without access to air conditioning, you can find relief by visiting air-conditioned public spaces like libraries or malls. Sitting near a fan and misting water on your skin, submerging your feet in cold water, soaking your clothing, and staying hydrated are effective ways to beat the heat.

Reporting by Associated Press reporter Seth Borenstein in Washington contributed to this article.