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May in Riachuelo averages 19°C (66°F) during the day and 12°C (54°F) at night. With just 74 mm (2.9 in) of rainfall on average, it doesn't get much drier than this.
If your ideal day consists of dry skies and pleasant temperatures, January and December typically offer the best circumstances for Riachuelo.
Pick a month to see the average temperature, rainfall and sunshine in Riachuelo - and find the best time to visit.
50-year average (1976-2025)
Based on our historical records, temperatures in Riachuelo 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).
50-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 Riachuelo spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
The extremes listed below come from historical weather data collected in Riachuelo from 1976 through 2026.
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).
Pleasant temperatures in May mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days.
We rated the following activities from 1 (least suitable) to 10 (best) to do.
See the full Riachuelo climate overview or explore weather in Uruguay.
Where to go in May - average daytime high across popular destinations.
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