Climate & Weather in Phoenix
Phoenix's climate is dominated by one real, serious, and worsening fact that this page treats with the seriousness it deserves rather than a euphemism: sustained, record-breaking, and genuinely lethal summer heat, documented in Maricopa County Public Health's own death statistics (427 heat-related deaths in 2025, per the base Phoenix record). Layered onto that is a real, currently unfolding, long-term water-supply strain tied to the Colorado River -- both are covered here in full, alongside real but secondary monsoon-season hazards.
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Learn moreRecord-Setting Extreme Heat: A Real, Escalating Pattern
Phoenix set a record of 54 consecutive days at or above 110°F in 2023 -- including a documented 31-day unbroken streak of 110-plus-degree weather in July 2023 -- before breaking its own record again in 2024 with 56 total 110-plus-degree days by early September and 70 such days by year's end, per KJZZ, ABC News, and AZFamily 2024 reporting. Separately, Phoenix set an all-time record with 100 consecutive days above 100°F in 2024, far surpassing the prior record of 76 straight days set in 1993. These aren't isolated anomalies -- they represent a real, escalating pattern of extreme-heat severity documented across multiple consecutive record-breaking years.
This Is a Genuine, Documented Public-Health Crisis -- Not Just an Inconvenience
As detailed in the base Phoenix record, Maricopa County Public Health documented 427 heat-related deaths in 2025 -- a real second consecutive year of decline from 608 in 2024 and 645 in 2023, credited in county reporting to expanded heat-relief funding starting in 2024, but still a large, serious toll. Within the 2025 total, 48% of decedents were experiencing homelessness and 64% of deaths involved drugs or alcohol -- context that clarifies who bears the highest risk without minimizing the underlying heat exposure itself, which affects a far broader population than just the most vulnerable. July and August are consistently the deadliest months, with temperatures peaking near 120°F. Anyone relocating to Phoenix, especially with heat-sensitive health conditions, outdoor-work exposure, or housing instability in their household, should weigh this seriously rather than discounting it as 'dry heat.'
Winters Are Genuinely Mild -- the Real Snowbird Draw
In sharp contrast to its summers, Phoenix winters are mild and dry, consistent with the base record's WARM_WINTERS tag -- a real, genuine draw for seasonal 'snowbird' residents and retirees (see the retiring topic page) escaping colder climates. This mildness is real, but it shouldn't distract from the severity of the summer extreme documented above; Phoenix's climate is genuinely bimodal rather than uniformly pleasant year-round.
A Real, Currently Unfolding Water-Supply Strain Tied to the Colorado River
As of 2026, the Colorado River basin is on track for its driest year on record, with Lake Powell at 24% full and Lake Mead at 32% full as of mid-April 2026, per KJZZ reporting. Arizona faces the largest mandatory Colorado River cuts in the river's history, with the Lower Basin states (Arizona, California, Nevada) collectively required to reduce usage by 1.25 million acre-feet annually in 2027 and 2028, and Central Arizona Project deliveries already reduced by 512,000 acre-feet as of 2026, primarily affecting agricultural users. Roughly 40% of Phoenix's current drinking-water supply comes from the Colorado River via the Central Arizona Project, with about 58% from the Salt and Verde rivers and only about 2% from groundwater, per City of Phoenix water-services reporting -- meaning Phoenix's own household tap water is comparatively less Colorado-River-dependent than some other Arizona communities, even as the broader regional water picture genuinely tightens. Valley cities describe having spent years preparing for these shortages and say taps are not expected to run dry, but this is a real, ongoing, and genuinely long-term consideration rather than a settled non-issue -- worth taking seriously for anyone planning a multi-decade relocation, especially to a newer, more groundwater- or CAP-dependent outer suburb (see the moving and buying-a-home topic pages for the related new-subdivision water-certification issue).
Monsoon Season: Real, Secondary Hazards
As detailed on the flood-hurricane-risk topic page, Phoenix's monsoon season (roughly June-September) brings real flash flooding, haboob dust storms, and damaging microbursts -- genuine, documented hazards, but secondary to the severity of the extreme-heat and long-term water-supply concerns covered above. Phoenix carries essentially no hurricane risk and does not have the severe-tornado-corridor profile of Tornado Alley or the Southeast.
Key takeaways
- Phoenix set and then broke its own extreme-heat records within one year: 54 consecutive days at or above 110°F in 2023 (including a 31-day unbroken July streak), followed by 56-then-70 total 110-plus-degree days in 2024, plus an all-time record 100 consecutive days above 100°F in 2024 (versus a prior 76-day record from 1993).
- Maricopa County documented 427 heat-related deaths in 2025 -- a real second consecutive year of decline from 645 in 2023, but still a large, serious public-health toll, with July-August consistently deadliest and highs near 120°F.
- Winters are genuinely mild and dry, a real draw for snowbirds and retirees -- but this shouldn't distract from the severity of Phoenix's documented summer heat crisis.
- The Colorado River basin is on track for its driest year on record in 2026 (Lake Powell 24% full, Lake Mead 32% full as of mid-April), with Arizona facing the largest mandatory Colorado River cuts in history -- a real, currently unfolding, long-term water-supply consideration, even though Phoenix's own tap water is only about 40% Colorado-River-sourced (58% Salt/Verde rivers, 2% groundwater) and Valley cities say taps aren't expected to run dry.
- Monsoon-season flash flooding, haboobs, and microbursts are real, documented, secondary hazards (see flood-hurricane-risk); Phoenix carries essentially no hurricane risk and lacks the severe-tornado-corridor profile of Tornado Alley or the Southeast.
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