🕒 Last updated on September 8, 2025
Southern Nevada is holding onto unsettled skies as pop-up showers and isolated thunderstorms stay in the forecast through Saturday. The weather is unpredictable, with sunshine giving way to storm clouds in a short span of time.
Pop-up showers keep weekend weather unpredictable
In Las Vegas, residents should stay alert to sudden changes. While much of the day may stay dry, scattered thunderstorms can form quickly, especially in the afternoon and early evening. These storms do not last long but may bring gusty winds, lightning, and heavy bursts of rain.
Humidity remains higher than usual across the valley. This extra moisture in the air adds fuel for thunderstorm development, even when rain chances appear small. Saturday’s forecast shows a drop in storm potential compared to earlier in the week, but forecasters say isolated activity cannot be ruled out.
Saturday’s high temperature in Las Vegas is expected to reach 96 degrees. The combination of warm air and higher humidity may make outdoor conditions feel sticky. Cloud cover during a storm can cool the air briefly, but drivers and outdoor visitors could face sudden visibility changes when a storm passes over.
Weekend heat builds before cooler changes arrive
Temperatures will climb higher as the weekend continues. Sunday and Monday are shaping up to be the hottest days in the near term. Highs around 100 degrees are forecast for Las Vegas, with mostly sunny skies overhead.
Even with the clearer conditions, isolated thunderstorms are still possible in parts of Southern Nevada. Mountain areas and the edges of the Las Vegas Valley tend to see the most activity, with storm cells forming in the heat of the afternoon. These short-lived storms can still bring dangerous lightning, brief heavy rain, and sudden gusts of wind.
Residents planning weekend activities should take extra care. Staying hydrated, limiting time outdoors during peak heat, and watching the sky for changing conditions are all important steps. For those driving, wet roads from quick downpours may cause slick conditions.
Overnight temperatures will remain warm, staying mostly in the mid-70s across the city. Mornings start warm and heat up quickly toward triple digits. The mix of lingering humidity and desert heat means the air can feel muggy, which is unusual compared to the typical dry climate Las Vegas is known for.
Midweek weather brings a fresh change
As the weekend heat builds, a shift in the weather is already on the horizon. A low-pressure system tracking in from the Pacific Ocean is expected to bring cooler air into Southern Nevada by the middle of next week.
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High temperatures will fall into the lower 90s, offering a noticeable change from the near 100-degree readings early in the week. Morning lows are forecast to dip into the upper 60s in some neighborhoods, giving the region a much cooler start to the day.
Along with the cooler air, humidity will drop as well. This will help the Las Vegas Valley return to its familiar dry desert pattern, with sunnier skies and lighter air. The arrival of this system will gradually reduce thunderstorm chances, leaving the weekend as the main window for pop-up storms.
Until then, residents across Southern Nevada can expect a mix of heat and unpredictability. Clear skies may dominate for much of the day, but the possibility of a quick thunderstorm remains, especially during the afternoon hours. While the storms may be isolated, they can change outdoor conditions suddenly, keeping locals and visitors on alert.