Las Vegas is starting Sunday with clear skies and temperatures already near 90 degrees before sunrise, but the brief calm will give way to one of the valley’s most punishing afternoons of the summer. The high is expected to reach about 112 degrees, with little relief overnight and a serious risk of heat-related illness.
Afternoon Heat Meets Sudden Storm Threat
Sunday will stay sunny through late morning before a 30% chance of showers and thunderstorms develops after 2 p.m. The National Weather Service Las Vegas says brief downpours and gusty winds will be the main concerns, with southeast winds reaching 12 mph and gusts up to 20 mph.
Storm chances are not high enough to count on meaningful rain across the entire valley, and any showers could be short-lived. But thunderstorms can produce abrupt wind shifts, blowing dust and isolated heavy rain, so outdoor plans may need a backup plan once the afternoon heating peaks.
Little Relief After Dark
Sunday night will remain partly cloudy with a low around 90 degrees, and temperatures could rise slightly overnight instead of offering a real cooldown. That warm nighttime pattern is especially tough on people without reliable air conditioning, outdoor workers and anyone spending extended time outside.
Monday will bring another sunny and dangerously hot day, with a high near 111 degrees and heat index values reaching roughly 106. The Extreme Heat Warning remains in effect through 8 p.m. Monday, covering the Las Vegas Valley and other parts of Southern Nevada.
Storm Chances Increase As Temperatures Ease
The forecast takes a more humid and stormier turn beginning Tuesday. Highs are expected to ease from about 106 degrees Tuesday to 102 Wednesday and around 99 Thursday and Friday, while daily chances for showers and thunderstorms increase.
That shift will bring somewhat less intense daytime heat than the weekend, but it comes with its own hazard. Forecasters say deeper monsoonal moisture could increase the risk of isolated flash flooding, particularly when storms linger over vulnerable areas; the pattern is a more active version of the earlier June heat wave covered by Hoodline.
Heat Safety Is The Main Assignment
Residents should drink water regularly, stay in air conditioning or shaded spaces, and move strenuous outdoor work to early morning or evening. Never leave children or pets in a parked vehicle, and check on older neighbors or anyone who may be vulnerable to extreme heat.
Anyone who develops confusion, faintness, severe weakness or other signs of heat stroke should be moved to a cool place and treated as an emergency. With temperatures above 110 degrees and storms capable of sending sudden gusts through the valley, Sunday is a day to keep plans flexible and avoid treating the forecast like a suggestion.
