Texas, United States of America · population 1,469,845 · 200 weather stations within 200 km · records 1799 to 2025
San Antonio has an average annual daytime high of 26.8°C, based on the 1951 to 1980 baseline. Its warmest month is August, when highs typically reach 35.3°C, and its coldest is January, with overnight lows near 4.2°C.
These figures reflect annual averages, not single-day records. Daily observations are outside this dataset's precision.
Since 1900, San Antonio's average temperature has risen by +2.0°C. Compared to the earliest station records that begin in 1799, warming totals +1.9°C.
20-year smoothed annual temperature reconstructed from station anomalies. Dashed line: 1951–1980 baseline.
Daytime highs sit within a comfortable 15°C to 26°C range.
San Antonio's average annual daytime high is 26.8°C, based on the 1951 to 1980 baseline period. The warmest month is August, with highs averaging 35.3°C, and the coldest is January, with lows averaging 4.2°C.
August is the warmest month in San Antonio, with typical daytime highs of 35.3°C.
2016 is the hottest year on record for San Antonio, running +2.0°C above the 1951 to 1980 baseline.
Yes. Since 1900, San Antonio has warmed by roughly +2.0°C.
January to December typically offers the most comfortable daytime highs, in the 15°C to 26°C range.
Baseline period 1951 to 1980. Monthly averages are the mean of station observations weighted by proximity. Warming trend is the 20-year smoothed anomaly against that baseline.