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Weather and Climate

Saguaro cactus amid mid-afternoon sun.

Tucson is reaching record-setting temperatures this season

Oct 2, 2024 September 2024 is the hottest on record, and October is also breaking records
The Pinyon Plain Mine shaft in Coconino County, on Wednesday, Aug. 30. In 2016, the mine shaft punctured a perched aquifer that contained natural levels of uranium, requiring the mining company Energy Fuels to pump water to the surface to an impoundment for treatment.

Uranium Mining in the Grand Canyon Region: Tribal Sovereignty vs. Nuclear Energy in the Climate Crisis

Oct 2, 2024 Uranium mining and nuclear energy may be affecting Arizona's tribal nations, posing threats to the region's water resources and the environmental and cultural heritage connected to them.
Michael Bogan, UA aquatic ecology professor holds up a Mexican amberwing dragonfly at the Santa Cruz River Heritage Project Reach in Tucson, Ariz., on Friday, Sept. 20.

Dragonfly Festival honors Tucson’s Santa Cruz River restoration

Sep 27, 2024 From wastewater to wildlife, how Tucson’s Heritage Project Reach became a thriving river ecosystem.
Highly treated wastewater and stormwater flows through the Santa Cruz River off of the Guy Tobin Trailhead in Rio Rico, Ariz., on Thursday, Aug. 1, 2024.

Efforts to protect Santa Cruz River gain ground with federal conservation plan

Sep 18, 2024 Community leaders and federal officials join forces to safeguard one of America’s most endangered plans
Phoenix officials are seeking public input on updates to the city’s Climate Action Plan, as the region grapples with human-caused climate change, including poor air quality, drought, and extreme heat.

Phoenix ends its streak of 100-degree days at 113 consecutive days

Sep 17, 2024 The National Weather Service said Tuesday’s high temperature was 93 degrees Fahrenheit (33.8 Celsius) at 4 p.m. MST.
Laura Daniel-Davis, Acting Deputy Secretary for the Department of the Interior announces federal investments to support wildland fire management at Saguaro National Park in Tucson, Ariz., on Tuesday, Sept. 10, 2024. Alongside Daniel-Davis is Tom Torres, Arizona State Forester and Director of the Department of Forestry and Fire Management.

Arizona gets $10 million from the Interior Department for wildland fire support

Sep 11, 2024 DOI Acting Deputy Secretary Laura Daniel-Davis visits Saguaro National Park.
Phoenix officials are seeking public input on updates to the city’s Climate Action Plan, as the region grapples with human-caused climate change, including poor air quality, drought, and extreme heat.

Phoenix weathers 100 days of 100-plus degree temps as heat scorches western US

Sep 3, 2024 That's long since shattered the record of 76 days in a row set back in 1993, according to data from the National Weather Service.
Havasu Falls

Havasu Falls closed indefinitely after deadly flash flood

Aug 28, 2024 Havasupai Tribe and emergency teams assessing damage.
Horseshoe Bend, five miles downstream from the Glen Canyon Dam and Lake Powell, is a popular viewing spot for the Colorado River.

Arizona, Nevada and Mexico will lose same amount of Colorado River water next year as in 2024

Aug 15, 2024 Long-term challenges remain for the 40 million people reliant on the imperiled river.
A monsoon approaches the intersection of Broadway and Treat Ave. in Tucson, Ariz., on Thursday, July 18, 2024.

2024 monsoon bringing much of Southern Arizona out of drought conditions

Aug 15, 2024 The Tucson metro area is about 2 inches above normal rainfall totals.
Saguaros leading the way up Agua Caliente Hill

Giant old saguaros can be resilient. It's baby saguaros researchers are worried about

Aug 14, 2024 Human-caused climate change is robbing the Sonoran Desert of the conditions needed to help baby saguaro take root and thrive.
A storm northwest of Tucson drops heavy rain on Oro Valley.

Arizona tribe wants feds to replace electrical transmission line after a 21-hour power outage

Aug 13, 2024 Tribal officials say the transmission line fails routinely and leaves residents and businesses without power — sometimes for days.
Antarctica landscape.

Satellites help researchers measure climate effects in Antarctica

Aug 11, 2024 Scientists are using data from orbit to keep track of snowfall and ice melt in the region.
Tucson Water's Advanced Oxidation Process Treatment Facility located at 1110 W. Irvington Road Tucson, Ariz. This facility that is operated and maintained by Tucson Water was brought online in 2014, and works in conjunction with the adjacent Tucson Airport Remediation Project (TARP) to treat for trichloroethylene known as TCE, 1,4 dioxane and other volatile organic compounds.

Toxic Waters: EPA and military clash over Tucson’s groundwater cleanup

Jul 31, 2024 Families affected by cancer and premature deaths blame a history of polluted water in southern Tucson. The water utility is trying to clean up the problem.
Pinyon Plain Mine in Coconino County, on Wednesday, Aug. 30. In 1984, Energy Fuels Nuclear Inc, proposed to recover a uranium ore deposit nine miles south of the Grand Canyon. Formerly known as Canyon Mine, Pinyon Plain mine has not mined uranium ore to this day, due to low commercial uranium prices.

Navajo Nation President stops truck carrying uranium across tribal lands

Jul 30, 2024 The uranium ore was being transported to Utah, where the only fully-licensed and operating conventional uranium mill in the United States is.
A graphic showing rainfall totals for Southern Arizona as of Friday, July 26, 2024.

A wet week brings above average rainfall totals for Southern Arizona

Jul 29, 2024 Tucson has accumulated almost four inches of rain since the season began.

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