Valparaiso, Chile · population 85,651 · 69 weather stations within 200 km · records 1849 to 2025
San Antonio has an average annual daytime high of 18.7°C, based on the 1951 to 1980 baseline. Its warmest month is January, when highs typically reach 22.8°C, and its coldest is July, with overnight lows near 5.7°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 +1.0°C. Compared to the earliest station records that begin in 1849, warming totals +1.6°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 18.7°C, based on the 1951 to 1980 baseline period. The warmest month is January, with highs averaging 22.8°C, and the coldest is July, with lows averaging 5.7°C.
January is the warmest month in San Antonio, with typical daytime highs of 22.8°C.
2016 is the hottest year on record for San Antonio, running +1.4°C above the 1951 to 1980 baseline.
Yes. Since 1900, San Antonio has warmed by roughly +1.0°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.