Daily highs around 110 and morning lows near 85 are forecast by the Las Vegas office of the National Weather Service from Saturday through Thursday.
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The World Weather Attribution study included Las Vegas and Phoenix, both having their warmest Junes in recorded weather history.
For those enjoying Juneteenth, the high should be close to seasonable near 101 with wind gusts to 21 mph.
Las Vegas was seeing hazy conditions on Sunday thanks to the Post Fire north of Los Angeles which started Saturday afternoon.
Atomic Golf customers had called its bays “stifling.” The off-Strip facility said it has fixed its system and is offering guests other ways to stay cool.
After two days of official 108 highs, Thursday and Friday are projected to reach around 106. Winds could gust to 22 mph Thursday, giving a blow dryer feel to the day.
Harry Reid International Airport set more records during a weeklong heat wave in early June.
In and around Las Vegas City Hall, people were going about their days as usual during the record-breaking heat wave in early June.
The Friday high should be around 109 with slightly lower temperatures on Saturday and Sunday, according to the National Weather Service.
The official airport measuring station reached 108 by 4 p.m. Wednesday. Thursday may top out at 112.
The heat wave may set a record for the earliest 110-degree reading at the Las Vegas airport. Area cooling centers will be open Wednesday through Friday.
The weekend highs will be a bit above normal before a few days of excessive heat in the middle of the coming week.
Morning lows will be in the mid-70s, with highs at or near 100 into next week.
A weak trough passing north of Las Vegas will bring some gusty winds as the only blemish on a Memorial Day weekend forecast, says the National Weather Service.
Reaching the mark is an unofficial start to the summer heat in the Las Vegas Valley, and officials publicly warned residents about heat dangers.