Rising Nighttime Temperatures Heighten Health Risks Amid Heatwave

The ongoing heatwave in the U.S. poses significant health risks, especially as nighttime temperatures offer little relief. The National Weather Service forecasts that more than 90 temperature records could be equaled or surpassed through Wednesday, with a majority being overnight heat records. Health experts caution that high overnight temperatures can prove more hazardous than daytime heat.

The early summer has been unusually hot across much of the U.S., exacerbated by a persistent heat dome expected to envelop the nation this week. Recent scorching temperatures have contributed to heat-related fatalities in New Jersey and intensified wildfires in the Western states.

Nighttime Heat Persists

The National Weather Service predicts that locations like Fort Lauderdale, Florida; Miami; Tampa, Florida; Galveston, Texas; and Charleston, South Carolina will not see nighttime temperatures drop below 80°F (27°C). In regions of the Midwest and Northeast known for cold winters, such as Fargo, North Dakota; International Falls, Minnesota; and Portland, Maine, overnight temperatures will remain above 70°F (21°C).

Health Risks Increase Without Nighttime Cooling

Experts stress the danger posed by high nighttime temperatures because they don’t allow the body to cool and recover from daytime heat. University of Georgia meteorology professor Marshall Shepherd explains that this lack of cooling can exacerbate health risks, particularly among the elderly and vulnerable populations. A few degrees increase in body temperature can result in heatstroke or excessive strain on the heart.

Proactive Measures Are Essential

Kristie Ebi, a public health and climate scientist at the University of Washington, indicates that health issues often emerge on the second or third day due to insufficient cooling at night. Early warning signs include heavy sweating, muscle cramps, and headaches.

To cool down during a heatwave, seek air-conditioned environments or use a cold towel. It is crucial to check on relatives and friends, particularly older adults or individuals with conditions that hinder heat tolerance.

Cooling Strategies Without Air Conditioning

For those without air conditioning, relief can be found in local libraries or malls, using fans while spraying water on the skin, soaking feet or clothes in cold water, and staying hydrated by drinking plenty of water.

Reporter Seth Borenstein from Washington contributed to this report.