The National Weather Service warned that dangerously high temperatures and humidity in the United States over the weekend could quickly cause heat stress or heat stroke, if precautions are not taken. The NWS advises people to check in on relatives and friends, especially the elderly.

Temperatures have been rising in cities from the Midwest to the East Coast because of a high pressure system that has trapped the warm air. City officials are allowing public pools to stay open longer and municipalities are issuing advisories to inform the public about how best to deal with the heat.

Forecasters say temperatures in New York City will reach 33 degrees Celsius Saturday, but with the humidity, it will feel like 43 degrees Celsius.

Saturday in the nation's capital will reach 38 degrees Celsius and Philadelphia will go up to 36 degrees Celsius.

The World Meteorological Organization says June 2019 was the planet's warmest month ever. In addition, both land and sea temperatures set record highs in June.

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June was also Europe's hottest June on record, according to the WMO. Greenland, Alaska and parts of South America, Africa and Asia had temperatures substantially above normal in June, according to the WMO. The organization said India and Pakistan experienced a severe heatwave in the early part of June, before the onset of the monsoon season. (VOA)