Arizona residents are moving into the season when weather questions rise along with temperatures, and federal forecasters have released a three-month outlook that offers a clearer sense of what June, July and August may hold. The seasonal forecast, covering the meteorological summer period, assigns probabilities for departures from long-term averages in both temperature and precipitation, allowing residents and officials to weigh the chances of hotter-than-normal days and an active rainy season.
Summer for the calendar year begins on Sunday, June 21, 2026, and forecasters use categorical language — "below normal," "normal" and "above normal" — to express the likelihood of temperature and precipitation outcomes over the three-month window. Those categories reflect probabilistic forecasts rather than precise daily forecasts, intended to indicate where climatological conditions are more or less likely to tip one way or another compared with historical averages.
On temperature, the outlook shows most of Arizona carrying a 40% to 50% probability of recording above-normal readings for the June-through-August period. That means a modest tilt toward warmer-than-average conditions across a broad swath of the state. The agency’s maps tighten that probability in the northwest corner of Arizona, where the forecast signals a 50% to 60% chance of above-normal temperatures. That area includes communities close to the Nevada state line and extends into more northern towns such as Beaver Dam.
Precipitation probabilities in the seasonal outlook also lean toward more rainfall for much of the state. The majority of Arizona is shown with a 33% to 40% chance of receiving above-normal precipitation over the three months, a projection that suggests a greater likelihood of a wetter-than-average monsoon and summer period for many residents and water managers. The types of storms monitored for such seasons often include intense, localized convective events.
Lightning flashes behind saguaro cacti in the Sonoran Desert during a summer storm — the type of monsoon thunderstorm the National Weather Service monitors when forecasting Arizona’s rainy season.
There are, however, pockets that differ from the statewide signal. A slender band along the western edge of Arizona is shown with only an equal chance of being wetter than normal. That area runs north-south from around Beaver Dam down toward Yuma and reaches eastward as far as Peach Springs in Mohave County. In contrast, the northeastern corner of the state displays a stronger tilt toward increased rainfall, with a 40% to 50% probability of above-normal precipitation. That wetter signal encompasses central points near Page and stretches into the state’s northeastern reaches.
The seasonal outlook is produced through a combination of remote sensing and computer-based analysis. Forecasters rely on a suite of airborne and ground-based satellites to observe current atmospheric and surface conditions, then feed those observations into numerical, conceptual and statistical models that simulate how the atmosphere is likely to evolve. Those models — together with forecaster expertise and interpretive analysis — are used to produce the probability categories mapping temperature and precipitation tendencies relative to long-term climate averages.
Other organizations have also released their own summer predictions in recent weeks, providing additional perspectives people can compare with the federal outlook. Services such as the Old Farmer’s Almanac and private forecasting firms have issued seasonal predictions for the region, offering residents multiple assessments to consider as they prepare for the months ahead.
The three-month forecast is a planning tool rather than a day-by-day weather guide. It highlights regions where the odds favor departures from climatological norms, offering municipalities, water managers, emergency planners and the public information about the relative chances for a warmer summer and where rainfall may be more likely. The outlook’s probability bands provide the best available, model-informed assessment for June through August, based on current observations and the performance of forecasting systems.
Officials and residents looking for short-term or more detailed guidance should continue to monitor daily forecasts and local advisories as the season progresses, while using the seasonal probabilities to inform preparations for hotter conditions and for areas that the outlook shows are more likely to see above-average precipitation during the upcoming summer months.