Phoenix spring climate outlook points to warmer-than-average temperatures and below-normal rainfall from March through May

Warm and dry signal for meteorological spring

A new seasonal outlook for Phoenix indicates that meteorological spring (March through May) is likely to run warmer than the long-term average, while precipitation is projected to come in below typical levels. The outlook reflects a probabilistic shift in seasonal conditions rather than a day-to-day forecast, meaning short-lived cool downs and individual storm systems can still occur even in an overall warm, dry pattern.

For Phoenix, spring is a transitional period when winter storm tracks usually weaken and heat builds quickly ahead of summer. If rainfall underperforms, the region can enter the hottest months with drier soils and vegetation, conditions that can intensify heat impacts and complicate water and wildfire planning across central Arizona.

What the outlook suggests—and what it does not

Seasonal outlooks describe the likelihood that temperatures and precipitation totals will land above, near, or below average over a multi-month window. They do not specify exact high temperatures on specific dates, nor do they rule out rain events. Even in a spring flagged as drier than normal, a single organized storm can still bring meaningful rainfall, while a warm spring can still include brief cooler periods.

• Temperature: Increased odds of above-average temperatures for March–May, which can accelerate the seasonal shift toward early heat.
• Precipitation: Increased odds of below-average precipitation over the same period, consistent with a reduced frequency of widespread rain events.
• Variability: Short-term swings remain possible, including isolated storms and occasional cool spells.

Context: heat risk remains a major public-health concern

The spring outlook arrives after consecutive years in which extreme heat has been a defining regional hazard. Maricopa County’s final report for the 2024 heat season recorded 608 confirmed heat-related deaths, marking a year-over-year decline from 2023, when 645 heat-associated deaths were confirmed. County public health officials have also highlighted that the impacts of heat can be delayed, with deaths sometimes occurring after an initial exposure during the prior season.

Seasonal outlooks can help agencies and residents prepare for broad conditions, but heat risk in Phoenix is driven by both weather and exposure—especially for people without reliable cooling, hydration, or shelter.

What residents and planners watch next

Forecasters and emergency managers typically monitor how quickly the first prolonged heat episodes arrive, whether spring rainfall meaningfully offsets dry conditions, and how early-season warmth influences energy demand and outdoor safety. If the warm-and-dry pattern persists, attention often turns to heat-mitigation measures ahead of summer, including cooling access, hydration outreach, and clear public messaging for high-risk groups.