- Hot, dry weather worsened drought conditions across parts of Arizona.
- Late-season snow and rain in Colorado provided limited relief in some mountain areas.
- Northern California moisture improved short-term conditions but did little to rebuild snowpack.
- Forecasters warn that faster snowmelt could tighten water supplies later this summer.
Saturday, May 9, 2026 — The latest U.S. Drought Monitor report
released May 7 paints a mixed picture for the United States, with heavy rains helping parts of the South while much of the West continues to struggle with dry conditions and shrinking snowpack. Across the Colorado River Basin, concerns remain familiar: warm temperatures, limited moisture, and growing pressure on water supplies heading into summer.
While storms brought soaking rains to Texas and portions of the Deep South, conditions across the Colorado River Basin changed little overall. The basin, which supplies water to millions of people across Arizona, California, Colorado, Nevada, New Mexico, Utah, and Wyoming, continues to feel the effects of long-term drought and below-average snow conditions.
Arizona Sees More Dryness.
Arizona experienced some of the most notable drought deterioration in the latest report. According to the U.S. Drought Monitor, hot and dry weather intensified impacts across parts of the state, leading to “substantial degradation” in some areas. Dry conditions and higher temperatures increased stress on soils and vegetation as the region moves closer to the hottest part of the year.
The report noted that much of the West saw seasonably dry weather during the week. In Arizona, however, the combination of heat and lack of moisture caused conditions to worsen faster than in many neighboring regions. The concerns come as many reservoirs and rivers in the Colorado River system already remain under pressure from years of drought.
Colorado Moisture Offers Limited Relief.
Parts of Colorado received light to moderate precipitation during the week, including late-season mountain snow. Central Colorado saw enough moisture to produce some drought reduction in localized areas.
Still, the report suggested that the improvements were modest. Across much of the broader High Plains and interior West, precipitation totals were not large enough to produce major recovery. Cooler temperatures helped reduce evaporation rates for now, but forecasters continue to watch how quickly mountain snowpack melts in coming weeks.
Northern California Snowpack Still Weak.
Northern California received late-season moisture that temporarily boosted soil moisture and streamflows. However, the report emphasized that the precipitation did little to improve the unusually low snowpack in the northern Sierra Nevada.
Snowpack acts as a natural water storage system across the West. When snow levels remain low, rivers and reservoirs often receive less runoff during the summer months. The latest report warned that warmer-than-average temperatures expected across the West could accelerate snowmelt further. That may provide short-term increases in reservoir inflows but could leave less water available later in the season.
Colorado River Basin Watches Summer Closely.
The outlook for the coming weeks remains uncertain. Forecasts call for another stretch of mostly dry weather across much of the West, while temperatures are expected to trend above normal during the longer-range outlook period.
For the Colorado River Basin, that combination raises concerns about water demand and reservoir management heading into summer. Faster snowmelt, persistent drought, and warmer weather can place additional pressure on rivers, farms, cities, and ecosystems already dealing with limited supplies.
