Climate Insights for San Antonio

The climate in San Antonio is temperate. The average annual temperature is 13°C and approximately 326mm of precipitation falls per year. June is the wettest month, receiving around 104mm of rainfall. San Antonio is in the Southern Hemisphere. The seasons are reversed: summer runs from December to February, while winter falls between June and August. The summer months are: February, January, March. The coldest months are July, August, June, when temperatures can drop to 7°C.

San Antonio sees moderate temperature variation throughout the year, ranging from 7°C to 21°C. February is the warmest month, though highs remain moderate at 21°C with a mean of 17°C. July is the coolest month, with minimum temperatures around 7°C and an average of 10°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between March and April, with a 2°C shift in average temperatures.

San Antonio is a quite dry location, receiving approximately 326mm of precipitation annually, which averages out to around 27mm per month. The wettest month is June, averaging 104mm of rainfall. July and August also tend to see above-average precipitation. The driest month is February, with just 0mm. That's 104mm less than June, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

San Antonio is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 12km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 8km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 4km/h gap between the calmest and windiest months.

It is currently winter in San Antonio, which began on June 21, 2026. San Antonio is in the Southern Hemisphere, where the seasons are reversed: spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in February at around 21°C, while the coldest stretch bottoms out in July near 7°C. Spring is next, beginning on September 23, 2026 (9 days from now).

The best time to visit San Antonio is during January, February, March and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 3mm per month. By contrast, July can be quite cold with temperatures dropping to 7°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for San Antonio based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.