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San Juan Weather in August
In San Juan, August brings pleasant daytime temperatures around 21°C (70°F), with nights cooling to 4°C (39°F). Minimal rainfall is to be expected.
Rainfall in San Juan in August
On average, there are about a single day with rain during this month, averaging 14 mm (0.6 in). On the rare occasion it does rain, the shower can be quite heavy given the low total spread across a single day.
Temperature in San Juan in August
August is one of the better months to visit San Juan. Expect 21°C (70°F) during the day and 4°C (39°F) at night. August is a notable month of the winter season. Conditions are often most pleasant around the middle of the day. With overnight lows of 4°C (39°F), nights are cold. The cold air does make for deep, comfortable sleep if you have enough blankets.
Sunshine in San Juan in August
The city usually sees around 255 hours of sunlight, indicating many sunny days , a great month for sightseeing.If you're inclined towards comfortable temperatures and drier conditions, August is a good time to visit San Juan.
San Juan Temperature in August
Min Temperature
4°C (39°F)
Max Temperature
21°C (70°F)
Chance of Rain
4%
Precipitation
14 mm (0.6 in)
Rainy days
a single day
Humidity
47%
Sunshine
255 hours
Percentage Sunshine
74%
San Juan Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Juan - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in San Juan typically rise from around 18°C (64°F) at the start of August to approximately 21°C (70°F) by the end. Nights are cold, with lows typically ranging from 1°C (34°F) to 6°C (43°F).
Average temperatures in August
Historical weather records for San Juan in August
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 August
Based on 50 years of weather observations (1976-2026), these are the most extreme conditions recorded in San Juan.
- San Juan recorded its highest August temperature of 38°C (100°F) on August 28, 2015.
- The lowest overnight temperature recorded in August was -6°C (21°F) (August 3, 1991).
Best Places in Argentina in August
Find out more about the weather in Argentina and which places have the best travel conditions in this month. See all of Argentina in August →
perfect weather
pleasant
tolerable
unpleasant
poor
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).
What to Wear in San Juan in August
Comfortable temperatures call for an easy wardrobe in August. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Dry conditions mean you won't need to worry about rain protection. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.
What To Do in San Juan in August
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling10/10 -
Walking10/10 -
Barbeque9/10 -
Camping5/10 -
Outdoor sports10/10
San Juan 3-Day Forecast
More climate data for San Juan
Temperature Rainfall Sunshine Humidity
See the full San Juan climate overview or explore weather in Argentina.
Popular in August
Where to go in August - average daytime high across popular destinations.
Córdoba
21°C (70°F) Salta20°C (68°F) Villa Carlos Paz19°C (66°F) Mendoza17°C (63°F) Buenos Aires
18°C (64°F) Mar del Plata15°C (59°F) San Carlos de Bariloche
6°C (43°F) San Martín de los Andes6°C (43°F) Bucket list
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