Climate & Weather Guide
Climate zones, seasonal temperatures, rainfall patterns, and best travel times in Uruguay
Uruguay features a humid subtropical climate (Cfa) across nearly the entire country, with mild oceanic influences (Cfb) along the southeastern Atlantic coast. Summers from December to March are warm to hot, averaging 22-26°C, occasionally reaching 38-41°C during heat waves, especially in the northwest. Winters from June to August are cool and damp, with averages of 9-12°C and rare frosts. Rainfall is abundant and well-distributed year-round, ranging from 950 mm in Montevideo to over 1,600 mm in the north, with higher humidity and frequent fog near the coast. Sunshine is plentiful in summer, but rapid weather changes from passing fronts bring winds and thunderstorms, making the climate comfortable for residents year-round.
Summer Average
22-26°C
Winter Average
9-12°C
Climate Types
Humid subtropical and Oceanic
950-1600 mm
2,500-2,800 hours annually
70-85%
Regional Climate Variations
Northwest Interior
The northwest, including Artigas, Salto, and Paysandú, experiences the hottest summers with January averages around 26°C and peaks up to 41°C during heat waves. Winters are milder at about 12°C in July, with less rainfall influence from the coast. Thunderstorms are common in summer afternoons, and annual precipitation reaches 1,200-1,400 mm, decreasing slightly in winter. High humidity persists, but drier winters make it more comfortable than coastal areas. Ideal for those seeking warmer conditions away from ocean fog.
Hot, sunny summers with intense thunderstorms; mild, drier winters perfect for outdoor activities, though winds from the pampas can bring sudden changes.
Central Plains
Central Uruguay around Mercedes maintains a classic humid subtropical feel, with summer highs averaging 25°C and winter lows around 10°C. Rainfall is steady at 1,100-1,300 mm annually, evenly spread but peaking in autumn. Frequent fog and high humidity amplify the dampness, while flat terrain exposes areas to strong pampero winds and rapid front passages. Heat waves are less extreme than the northwest, and frosts occur yearly in winter, making it reliably temperate for expats.
Balanced warmth with consistent moisture; breezy and changeable weather suits active lifestyles, but prepare for foggy mornings and occasional chills.
Montevideo and South
Southern areas like Montevideo have cooler summers influenced by Atlantic breezes, averaging 22°C in January with highs to 28°C. Winters dip to 9°C in July, feeling damper due to 950-1,100 mm of even rainfall and frequent drizzle from cold fronts. Oceanic traits moderate extremes, but high humidity, fog, and winds prevail. Urban heat adds slight warmth, appealing to coastal dwellers seeking milder heat.
Mild, breezy coastal climate with cool ocean swims in summer; damp winters invite indoor comforts amid reliable sunshine.
Southeast Coast
The Punta del Este coast borders oceanic climate, with cooler summers at 22°C and sea temperatures of 22-23°C for swimming from January to March. Winters average 9-10°C, with abundant 1,100 mm rainfall and overcast spells. Southeast exposure brings steady moisture, fog, and winds, but extremes are rare. Popular for expats enjoying beach life tempered by ocean moderation.
Refreshing ocean breezes cool humid summers; cozy, drizzly winters with scenic storms, ideal for relaxed seaside living.
Uruguay's uniform humid subtropical climate offers mild temperatures, abundant rainfall, and ocean-tempered coasts, with subtle north-south gradients in heat and precipitation. Expats appreciate the lack of extremes, ample sunshine, and beach-friendly summers, though high humidity and winds require adaptation. Overall, it's highly livable for year-round outdoor pursuits.
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