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May in Colonia Rosario typically sees daytime highs of 19°C (66°F) and nighttime lows of 11°C (52°F). With the least rainfall of the year, it's a reliably dry month.
Should you favor a climate that's both dry and comfortably warm, December typically offers the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Pick a month to see the average temperature, rainfall and sunshine in Colonia Rosario - and find the best time to visit.
49-year average (1976-2025)
Based on our historical records, temperatures in Colonia Rosario typically drop from around 20°C (68°F) at the start of May to approximately 16°C (61°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 13°C (55°F).
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Browse day-by-day weather records for Colonia Rosario spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Our historical data for Colonia Rosario spans 1981 to 2026, revealing these weather extremes.
Find out more about the weather in Uruguay and which places have the best travel conditions in this month. See all of Uruguay in May →
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
Comfortable temperatures call for an easy wardrobe in May. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
See the full Colonia Rosario climate overview or explore weather in Uruguay.
Where to go in May - average daytime high across popular destinations.
Need travel inspiration? Check out our bucket list articles and be inspired.
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