Climate & Weather in Scottsdale
Scottsdale shares Phoenix's Sonoran Desert climate almost exactly -- genuinely mild, sunny winters, but real, documented, and worsening extreme summer heat: Phoenix has averaged 21 days a year at 110°F or hotter over the last three decades per National Weather Service data, but that average has jumped to 42 days a year since 2021, and Maricopa County recorded 430 heat-related deaths in 2025 (down from 608 in 2024 and 645 in 2023, but still a serious, real public-health toll).
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Learn moreA Real, Escalating Extreme-Heat Statistic, Not Just "It Gets Hot"
Over the last three decades, Phoenix (whose climate closely tracks Scottsdale's, given their shared Sonoran Desert valley-floor location) has averaged 21 days a year reaching at least 110°F, per National Weather Service data. Since 2021, that average has essentially doubled to 42 days a year at 110°F or hotter -- a genuine, documented shift, not a one-off hot year. July, Scottsdale's hottest month, runs a cited average high around 106°F, with daily highs routinely reaching 110°F or above during peak summer, per aggregated 2026 climate-guide sourcing.
Heat-Related Deaths: A Real, Serious, and Genuinely Improving-but-Still-High Toll
Maricopa County (which includes Scottsdale) recorded a preliminary 430 heat-related deaths in 2025 -- down from 608 in 2024 and 645 in 2023, a real two-year improvement per Maricopa County Public Health's 2026 heat-plan reporting. Phoenix accounted for the largest share (233 deaths in 2025), with Mesa (39) and Tempe (18) next; Scottsdale-specific death counts were not broken out in the sourcing reviewed this pass. Among confirmed 2025 deaths, 77% of victims were found outdoors, 65% involved substance use, nearly half involved individuals experiencing homelessness, and about 60% were age 50 or older -- context that matters for understanding who bears this risk most, even though the toll is a real, county-wide public-health concern, not confined to any one demographic.
Monsoon Season: June Through September, With Real Flash-Flood and Dust-Storm Risk
Arizona's monsoon season -- roughly mid-June through September -- brings Scottsdale's primary severe-weather risk: intense, often brief thunderstorms capable of producing flash flooding (see the flood-hurricane-risk topic page for the Indian Bend Wash Greenbelt and current flood-rescue detail), damaging winds, and haboob dust storms. This is a fundamentally different seasonal-hazard pattern than hurricane season in coastal states or tornado season in the Southeast/Plains, both covered elsewhere in this project -- Scottsdale's summer hazard is heat and monsoon storms, not tropical systems or tornado outbreaks.
Winters Are Genuinely Mild -- and No Daylight Saving Time
Scottsdale's winters are mild and sunny by national standards, a core part of both its snowbird draw (see the moving and retiring topic pages) and its resort/golf-tourism identity (see the base Scottsdale record's WM Phoenix Open detail). Arizona's year-round Mountain Standard Time (no daylight saving time, in effect since 1968, alongside only Hawaii among US states) is a real, practical quirk that shows up seasonally too -- Scottsdale aligns with Pacific time for part of the year and Mountain time for the rest, worth knowing when scheduling anything across time zones.
Key takeaways
- Phoenix/Scottsdale's extreme-heat statistics show a real, documented escalation: 21 days/year at 110°F+ over the last three decades, versus 42 days/year since 2021 -- essentially double, per National Weather Service data.
- Maricopa County recorded 430 heat-related deaths in 2025 -- a real improvement from 608 (2024) and 645 (2023), but still a serious public-health toll; Phoenix accounted for the largest share (233), with Scottsdale-specific figures not broken out in sourcing reviewed this pass.
- Monsoon season (roughly mid-June through September) is Scottsdale's primary severe-weather risk -- flash flooding, damaging winds, and dust storms (haboobs) -- a fundamentally different hazard pattern than hurricane or tornado season covered elsewhere in this project.
- Winters are genuinely mild and sunny, a real driver of Scottsdale's snowbird and resort-tourism identity; Arizona's year-round Mountain Standard Time (no DST, since 1968) is a real, practical scheduling quirk worth knowing about.
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