🇺🇾Uruguay

Uruguay (176,215 km²) spans 30°–35°S, 53°–58°W across the southeastern South American plains between the Río de la Plata estuary and Brazil, forming a compact territory of gently rolling hills (cuchillas) rarely exceeding 500 m elevation, with a temperate humid subtropical climate (Köppen Cfa) strongly modulated by Atlantic maritime influence and the absence of major topographic barriers.

The climate features warm, humid summers (January averages 22–26°C) and mild winters (July 10–14°C) with modest diurnal and seasonal temperature swings, no true dry season, and 900–1,400 mm annual precipitation distributed relatively evenly but peaking in autumn-winter frontal passages.

The fertile Pampean grasslands (campos) dominate the interior rolling hills and support extensive cattle ranching and agriculture (wheat, soybeans, rice), while the Atlantic coastal plain from Punta del Este northward to the Brazilian border receives slightly higher rainfall and features coastal lagoons, dunes, and palm groves (Butia capitata).

The Río Uruguay and Río de la Plata western borders create humid riparian microclimates, while the northern interior near Salto and Artigas experiences slightly warmer summers and more pronounced winter cold fronts pushing up from Patagonia. Uruguay's small size, agricultural export dependence, and reliance on hydroelectric power from the Río Negro and Río Uruguay dams render it acutely vulnerable to accelerating climate extremes: intensifying droughts devastate pasture and crops while threatening urban water supplies, severe flooding disrupts infrastructure and agriculture, and shifting precipitation variability destabilizes the energy-water nexus critical to the economy.

Montevideo (capital, 34.9°S, elevation 43 m on the Río de la Plata) exemplifies the Atlantic-moderated subtropical climate, averaging 24°C in January and 12°C in July with approximately 1,100 mm annual precipitation fairly evenly distributed but with autumn-winter maxima during frontal storms.

The severe 2020–2023 prolonged La Niña drought, the worst in 78 years of instrumental records, damaged Uruguay with exceptional multi-year rainfall deficits that dried rivers, decimated agriculture (cattle slaughter rates surged, crop yields collapsed), and triggered a national water-supply emergency when the critical Paso Severino reservoir feeding Montevideo nearly emptied in May 2023, forcing authorities to blend brackish Río de la Plata estuary water with potable supplies—affecting 60% of the national population with undrinkable, salty tap water and sparking public outcry and mass bottled-water distribution.

The severe January 2022 heatwave broke records across Uruguay when temperatures exceeded 42°C in Paysandú and soared above 38°C in Montevideo for consecutive days, overwhelming health services, triggering wildfire outbreaks, and killing dozens. The severe December 2009 tornado outbreak struck southwestern Uruguay near Dolores in Soriano Department when an exceptionally violent EF3-equivalent tornado—rare for South America—carved a long damage path, killing two people, injuring over 60, and destroying hundreds of homes and farms.

The severe May 2007 flooding inundated the Río Uruguay basin when persistent torrential rains (over 400 mm in 10 days) across the upper watershed triggered severe floods in Salto, Paysandú, and Fray Bentos, displacing thousands, submerging farmland, and causing tens of millions in agricultural and infrastructure losses.

The severe April 2017 Salto floods brought even worse devastation when the Río Uruguay crested at historic levels, inundating the city center, forcing mass evacuations of over 10,000 residents, and overwhelming flood defenses built after 2007. The horrific 2023 Río Negro fish-kill shocked the nation when drought-depleted flows, record-high water temperatures exceeding 30°C, and suspected agricultural runoff triggered a massive hypoxic event downstream of the Rincón del Bonete hydroelectric reservoir, killing hundreds of thousands of fish (dorado, sábalo, bagre), fouling beaches, and exposing the fragility of Uruguay's premier river ecosystem under climate stress.

Salto (northern Río Uruguay, 31.4°S, 48 m elevation) averages 26°C in January and 13°C in July with 1,150 mm rainfall, while Punta del Este on the Atlantic coast averages 23°C in January and 11°C in July with cooler ocean-moderated summers and 1,050 mm precipitation. Increasing Pampean drought variability linked to shifting ENSO and Atlantic SST patterns threatens Uruguay's water security, agricultural viability, and energy generation as climate change intensifies hydrological extremes.

Our archive covers 0 Uruguayan cities with daily ERA5 reanalysis data going back to 1940.