LAS VEGAS — Temperatures in the 90s this morning will hit 100° by 11:00 a.m. under a partly cloudy sky. Highs reach 109° today as south winds blow at 15-25 mph. A few isolated showers are possible in the valley due to the heat and building clouds, but the chance is only 10%. There's a 30% chance over the mountains. We'll linger in the triple digits until 10:00 p.m., with lows only dropping to the upper 80s for a couple hours near sunrise tomorrow morning. Monsoon mugginess is more noticeable on Thursday, Friday, and Saturday, increasing the chance of rain and storms to 20%-30% from late morning through the afternoon. Highs hover at 108°-109° those days, with partly to mostly cloudy conditions and continued south gusts of 20-25 mph. The rain chance drops to 10% Sunday through early next week, and with more sunshine and some lingering humidity, highs of 107°-109° will remain unpleasant. Nighttime lows remain in the mid and upper 80s during this stretch, which means quick warm-ups through the 90s from 7:00 a.m. to 10:00 a.m. most days.
To beat the heat, shift outdoor activities to between 5:00 a.m. and 9:00 a.m. or wait until after 7pm to avoid direct sunshine; sun set is near 8:00 p.m. but it doesn't get dark until after 8:30 p.m. When working or exercising outside remember to drink extra water, seek shade, and wear lightweight, light-colored clothing with a hat and sunscreen. Avoid excess caffeine and alcohol. Keep a close eye on pets to make sure they are drinking plenty of water. It's important to watch those vulnerable to the intense heat, including young kids, the elderly, and people with health issues that make them prone to heat illness.