San Antonio Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit San Antonio.
Climate overview of San Antonio
San Antonio, Argentina, experiences significant temperature variation throughout the year. Summers bring daytime highs of 29°C (84°F) in January, while winters cool to 14°C (57°F) in July.
The city tends toward dry conditions, with around 311 mm (12 in) of rainfall per year. It does, however, have very little rainfall year-round, with warm summers and mild winters.
San Antonio Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in San Antonio - and find the best time to visit.
Monthly Temperature in San Antonio
Depending on the time of the year, temperatures range from comfortable to moderate in San Antonio. Typically, average maximum daytime temperatures range from a comfortable 29°C (84°F) in January to a moderate 14°C (57°F) in the coolest month, July.
Nights vary from 18°C (64°F) in January to around 4°C (39°F) during the colder months.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in San Antonio
With annual rainfall averaging 311 mm (12 in), San Antonio maintains relatively low precipitation levels throughout the seasons. San Antonio offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between the wettest month March (33 mm (1.3 in)) and the driest month December (17 mm (0.7 in)) is not too significant. For more details, please visit our San Antonio Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Water Temperature in San Antonio
The mean water temperature over the year ranges from 10°C (50°F) in August to 18°C (64°F) in January.
Water temperature over the year
Humidity in San Antonio by Month
The relative humidity is moderate throughout the year in San Antonio.
The city experiences its highest humidity in June, reaching 69%. In January, the humidity drops to its lowest level at 47%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Wind Speed in San Antonio
The average wind speed over the year ranges from 3 m/s (6 knots) to 5 m/s (10 knots). It is lower in April and higher in January, November and December. What does this mean?
The mean monthly wind speed over the year (meters per second)
Best Time to Visit San Antonio
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: January, February, March, April, September, October, November and December
- Warmest weather: January and February
- Warmest water temperature: January, February and March, although the water may still feel cool.
- Seasonal pattern: Very little rainfall year-round, with warm summers and mild winters
Frequently asked questions about the climate in San Antonio
What is the best time to visit San Antonio?
January, February, March, April, September, October, November and December typically offer the most optimal weather in San Antonio. In contrast, May, June, July and August tend to have less optimal conditions. San Antonio has very little rainfall year-round, with warm summers and mild winters.
What temperatures can I expect in San Antonio?
Daytime highs range from 14°C (57°F) in July to 29°C (84°F) in January. Nighttime lows range from 4°C (39°F) to 18°C (64°F). Temperatures vary considerably through the year.
How much rain does San Antonio get?
Annual rainfall is around 311 mm (12 in). March is the wettest month with 33 mm (1.3 in), while December is the driest with 17 mm (0.7 in).
San Antonio 3-Day Forecast
San Antonio 3-Day Forecast
San Antonio on the map
San Antonio is highlighted - select any city to see its climate.
Popular this month
Where to go in July - average daytime high across popular destinations.
Córdoba
18°C (64°F) Salta
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4°C (39°F) San Martín de los Andes4°C (39°F) 
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