WASHINGTON -- In what is now one of the hottest U.S. summers on record, 43 of the 50 states have had temperatures soaring to 90 degrees or higher. And forecasters warn it's only going to get worse.
Over the weekend, the National Weather Service issued excessive heat warnings for parts of Missouri, Oklahoma and Kansas with heat indexes hovering near 110 degrees. Also, heat advisories were also issued from Utah to Tennessee and up the East Coast to New York.
But not even the scorching heat was able force outdoor enthusiasts to retreat.
"I wore a white shirt on purpose so I could sweat through it and it won't be too embarrassing," one D.C. resident said. "But it is extremely hot."
In California, some residents tried to beat the heat by getting outdoors early in the morning.
"You got to get out awfully early to beat that heat," said one California resident, who braved the heat to play football with his friends. "It's hot out here. It's about 90 degrees already - 8 o'clock. We're sweating."
Others preferred to wait well after the sun went down.
"On Thursday I came after almost 8 o'clock at night, because I tried running after 5 after work on Wednesday and I nearly collapsed," one California woman said. "I couldn't do my normal two laps around. It was hard for me to breathe. It was that humid."
One litter of puppies kept cool by getting pampered by cheerleaders from the New England Patriots at the team's annual Paw Wash.
And at the National Zoo in Washington, D.C. the animals seemed as if they didn't want to come out and play.
"Since it is so hot they're all just hiding," one zoo visitor observed. "They're in the shade. So we came out to the zoo not to see very many animals."
Meanwhile, across the pond, Europeans have been sweltering in the hot sun as well. In some places, temperatures soared past 100 degrees.
Not everyone was complaining though.
"It's nice, it's the summer," said one woman from Milan, Italy who was visiting London. "I was here last when it was snowing. It's nice to have it in the sun."
Near the Kremlin in Moscow, some people jumped into a city fountain still wearing their street clothes to cool off.
Meanwhile, scientists from the National Climatic Data Center said last month's combined global land and ocean surface temperature made this past June the warmest on record. And forecasters warned July could end up being even worse.
"Our AccuWeather.com summer forecast is calling that from the mid to late part of the season, we're going to be seeing the worst of the heat yet," AccuWeather's Katie Fehlinger said. "So, yeah, it's been hot already, it's going to get worse."