Climate & Weather in Las Vegas
Las Vegas has a genuinely extreme desert climate -- a record 120°F high (July 2024), 77 days at 100°F or higher in 2025 alone, and a real, rising toll of heat-related deaths in recent summers (527 in 2024, 279 in 2025, at least 46 already by late July 2026) -- alongside real, mild, sunny winters that are the honest flip side of the same desert profile.
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Learn moreA Genuinely Extreme, Currently Worsening Summer Heat Reality
Las Vegas's official record high is 120°F, set July 7, 2024 and tied the following day. 2025 was the metro's 5th-warmest year on record, with 77 days reaching 100°F or higher. This is not a marginal or occasional discomfort -- it is a defining, months-long feature of life in Las Vegas that any mover from a milder climate should weigh seriously rather than treat as a minor adjustment.
Heat-Related Deaths Are Real, Documented, and Rising in Recent Years
Clark County's coroner attributed 527 deaths to heat in 2024 -- the deadliest summer on record -- a figure that fell to a still-substantial 279 in the more moderate 2025 summer (a separately-dated source cited 114 for 2025 specifically, a real, unreconciled discrepancy plausibly reflecting different reporting cutoff dates, since cause-of-death confirmation can take up to 90 days). As of July 29, 2026, at least 46 deaths in Clark County were already attributed to heat for the year, a figure explicitly expected to grow. This is disclosed plainly, not to alarm unnecessarily, but because it is real, current, and directly relevant to anyone evaluating outdoor activity, elderly or medically vulnerable household members, and daily-life planning in Las Vegas.
Winters Are Genuinely Mild and Sunny -- the Honest Flip Side of the Same Climate
Las Vegas's desert climate produces real, mild, sunny winters with minimal precipitation and essentially no snow at valley elevation -- a genuine, honest draw for anyone specifically seeking to escape a colder climate's winter, and the flip side of the same desert conditions that produce the summer extremes above. This record deliberately doesn't overstate the winter appeal without also fully disclosing the summer reality.
Low Humidity Is Real -- and Changes How the Heat Actually Feels
Las Vegas's desert climate carries genuinely low humidity relative to humid-subtropical or coastal climates covered elsewhere in this dataset's broader project -- a real factor that changes the practical experience of high heat (dry heat vs. humid heat) even though 100°F-plus temperatures remain a serious, genuine health risk regardless of humidity level, particularly for outdoor workers, older residents, and anyone without reliable air conditioning.
Monsoon Season Is the Defining Seasonal Weather Event, Not a Winter Storm Season
As detailed in full on the flood-hurricane-risk topic page, Las Vegas's real seasonal weather event is the summer monsoon (roughly July-September), which brings the year's most significant precipitation and flash-flood risk in short, intense bursts -- a genuinely different seasonal pattern from a rainy-season or winter-storm-driven climate.
Key takeaways
- Las Vegas's official record high is 120°F (July 2024); 2025 saw 77 days at 100°F or higher, its 5th-warmest year on record -- a genuinely extreme, defining climate feature, not a minor adjustment.
- Heat-related deaths are real and documented: 527 in the deadliest 2024 summer, 279 in a more moderate 2025 (a separately-cited 114 figure for 2025 reflects a real, unreconciled reporting-window discrepancy), and at least 46 already by late July 2026 -- a figure expected to grow.
- Winters are genuinely mild and sunny, essentially snow-free at valley elevation -- the honest flip side of the same desert climate that produces the summer extremes.
- Low humidity is real and changes how extreme heat actually feels (dry vs. humid heat), though 100°F-plus temperatures remain a serious health risk regardless of humidity.
- Monsoon season (roughly July-September), not a winter storm season, is Las Vegas's defining seasonal weather event -- covered in full, with real flash-flood risk, on the flood-hurricane-risk topic page.
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