Answer
Summers in Uruguay are warm or hot, often humid; winter temperatures usually remain above severe frost levels, but wind, dampness, and cool nights noticeably affect comfort. Snow is rare, and the weather can change quickly after the arrival of an atmospheric front.
On the coast, the wind is more noticeable, while inland areas can experience greater daily temperature swings. A summer day is not always suitable for the beach: waves, thunderstorms, or a high UV index can change plans. In winter, the main problem is often not being outdoors, but poorly insulated housing without effective heating.
Before renting, check the windows, dampness, and winter utility bills. For a trip, bring layers, a windbreaker, and sun protection regardless of the season, and check the exact forecast for your destination city.