Tropical Storm Marie to Boost Rain Chances in Arizona and Southern California

Key points

• Tropical Storm Marie formed off Mexico’s coast on September 2, 2026, and is projected to stay offshore while moving northwest.
• Arizona expects a 30-40% chance of rain between Thursday night and Saturday morning due to tropical moisture, with temperatures slightly below normal at 100-103 degrees.
• Southern California may experience scattered showers and up to 0.5 inches of rain in the mountains by Labor Day, with life-threatening surf and rip current conditions expected over the weekend.
• The National Hurricane Center forecasts Marie to strengthen into a hurricane by Wednesday before weakening as it encounters cooler waters later in the week.

Background

This event follows a series of tropical systems in 2026, including Tropical Storm Dolly in late August, which brought rainfall to Puerto Rico and the Caribbean, and Tropical Storm Bertha in July, which threatened the Gulf Coast with heavy rain and storm surge. These prior events highlight the ongoing impact of tropical systems on various U.S. regions.

How outlets are covering it

AZFamily emphasizes the direct impact on Arizona, noting a 30-40% chance of rain and slightly below-normal temperatures, while KCRA focuses on indirect effects in Southern California, highlighting potential scattered showers and up to 0.5 inches of rain in mountainous areas. Both sources agree that Marie will not make landfall but will influence weather patterns through moisture transport. KCRA also notes that forecast models may change as the storm’s path becomes clearer, whereas AZFamily focuses on the immediate rain chances for the Phoenix area.

Why it matters

The indirect impacts of Tropical Storm Marie could provide much-needed rainfall to drought-prone areas in Arizona and Southern California, while also posing risks such as heavy rain, life-threatening surf, and rip currents. Accurate forecasting is critical for residents planning activities during the Labor Day weekend.

What to watch

Forecasters will continue to monitor Marie’s path and update rain chances for Arizona and Southern California over the weekend. Residents in affected areas should stay alert for potential heavy rain, surf conditions, and any changes in the storm’s trajectory.