San Juan Weather in May
May in San Juan brings pleasant temperatures, with daytime highs of 21°C (70°F) and nights around 7°C (45°F). The perfect weather makes it a solid choice for a visit.
Rainfall in San Juan in May
Analyzing past climate data, one can expect approximately a single day of rain, averaging 16 mm (0.6 in). Any rain that does arrive tends to come in a single sharp spell rather than prolonged drizzle.
Temperature in San Juan in May
May in San Juan is generally perfect, with days reaching 21°C (70°F) and nights settling around 7°C (45°F). Temperatures can feel cooler in the morning and evening, so layering is often the best approach. At 7°C (45°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in San Juan in May
There are approximately 230 hours of sunshine this month, resulting in mostly clear days.So this is a great month to visit if you prefer dry days with pleasant temperatures.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Argentina, check out our San Juan's climate page.
San Juan Temperature in May
Min Temperature
7°C (45°F)
Max Temperature
21°C (70°F)
Chance of Rain
4%
Precipitation
16 mm (0.6 in)
Rainy days
a single day
Humidity
62%
Sunshine
230 hours
Percentage Sunshine
71%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Juan typically drop from around 22°C (72°F) at the start of May to approximately 18°C (64°F) by the end. Nights are cold, with lows typically ranging from 3°C (37°F) to 9°C (48°F).
Average temperatures in May
Historical weather for San Juan in May
Browse day-by-day weather records for San Juan spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
San Juan historical weather extremes in May
The extremes listed below come from historical weather data collected in San Juan from 1976 through 2026.
- The warmest day in May was on May 20, 2008, with a maximum of 35°C (95°F).
- The coldest night in May in San Juan was on May 31, 1988, with a minimum of -4°C (25°F).
Best Places in Argentina in May
Find out more about the weather in Argentina and which places have the best travel conditions in this month. See all of Argentina in May →
perfect weather
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tolerable
unpleasant
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What to Wear in San Juan in May
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. With minimal rainfall expected, you can leave the rain gear at home. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in San Juan in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Argentina, check out our San Juan's climate page.
Temperature Rainfall Sunshine Humidity
See the full San Juan climate overview or explore weather in Argentina.
