Overview
- Tropical Storm Iselle formed southwest of Cabo San Lucas and began strengthening into a hurricane after Aug. 23, but Mexico's Servicio Meteorológico Nacional says its track keeps it well offshore and not a direct threat to Mexican territory.
- Conagua and the SMN say the Mexican monsoon and multiple tropical waves will produce heavy to very heavy rains, thunderstorms and localized hazards across Pacific, central and southeastern states, with targeted local warnings in places such as Nayarit for 50–75 mm of rain, strong gusts and 1–2 m coastal waves.
- Extreme heat continues in northwest Mexico as the canícula runs to early September, with official forecasts showing sustained temperatures above 45°C and local peaks near 46°C in San Luis Río Colorado, prompting health and safety advice on hydration and avoiding midday sun.
- Peru's Senamhi issued red alerts for 21 regions including Lima after daytime temperature records and prolonged warm spells tied to El Niño Costero, and officials warned of strong sun and gusty winds that raise public health and marine risks.
- Argentina's SMN placed several provinces under orange and yellow alerts for heavy rain, snow, strong winds and Zonda events on Aug. 26, and national agencies across the region urged residents to secure property, avoid flooded areas and follow local civil protection guidance.