July weather in San Marcos, TX
The average temperature in San Marcos in July is 84.5°F (73.4°F–95.7°F). Average precipitation: 2.21 inches.
July is a summer month in San Marcos, and is warmer than the annual average of 68.6°F. Daily temperatures swing about 22.3°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 13h 45m. For travel, July is hot.
Avg High
95.7°F
Avg Low
73.4°F
Precipitation
2.21 in
Daylight
13h 45m
July records in San Marcos
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| July 1 | 102.9°F (1942) | 63.0°F (1923) | 3.10 in (1936) |
| July 2 | 104.0°F (1928) | 64.9°F (1924) | 3.49 in (2002) |
| July 3 | 105.1°F (1928) | 60.1°F (1924) | 1.10 in (1915) |
| July 4 | 102.9°F (1928) | 59.0°F (1924) | 2.85 in (1998) |
| July 5 | 102.9°F (1928) | 61.0°F (1924) | 2.62 in (1942) |
| July 6 | 102.9°F (1922) | 63.0°F (1924) | 2.61 in (1942) |
| July 7 | 104.0°F (1925) | 61.0°F (1924) | 2.35 in (1958) |
| July 8 | 108.0°F (1939) | 63.0°F (1972) | 1.89 in (2018) |
| July 9 | 106.0°F (1925) | 66.0°F (1929) | 3.26 in (1973) |
| July 10 | 106.0°F (2022) | 63.0°F (1905) | 2.27 in (2018) |
| July 11 | 107.1°F (2022) | 59.0°F (1905) | 0.96 in (1988) |
| July 12 | 107.1°F (2022) | 64.0°F (1905) | 3.74 in (1941) |
| July 13 | 107.1°F (2020) | 64.9°F (1975) | 3.35 in (1939) |
| July 14 | 109.0°F (1925) | 64.0°F (1953) | 1.07 in (1983) |
| July 15 | 109.0°F (1925) | 64.9°F (1967) | 4.53 in (1990) |
| July 16 | 106.0°F (1923) | 55.9°F (1967) | 1.60 in (1965) |
| July 17 | 106.0°F (1932) | 57.0°F (1967) | 1.58 in (1976) |
| July 18 | 108.0°F (1918) | 62.1°F (1967) | 1.30 in (1926) |
| July 19 | 106.0°F (1927) | 64.9°F (1934) | 2.15 in (1932) |
| July 20 | 106.0°F (1928) | 64.9°F (1946) | 3.04 in (2007) |
| July 21 | 105.1°F (1922) | 66.0°F (1904) | 3.00 in (1909) |
| July 22 | 106.0°F (1922) | 62.1°F (2007) | 1.00 in (1926) |
| July 23 | 106.0°F (1922) | 60.1°F (1970) | 1.60 in (1933) |
| July 24 | 106.0°F (1924) | 61.0°F (1915) | 2.00 in (1927) |
| July 25 | 106.0°F (1924) | 62.1°F (1915) | 1.50 in (1927) |
| July 26 | 105.1°F (1922) | 64.0°F (1942) | 3.10 in (1934) |
| July 27 | 109.9°F (1954) | 64.0°F (2010) | 1.02 in (1943) |
| July 28 | 107.1°F (1924) | 60.1°F (2010) | 4.49 in (1979) |
| July 29 | 107.1°F (1925) | 61.0°F (2010) | 7.32 in (1902) |
| July 30 | 108.0°F (2017) | 63.0°F (2010) | 2.60 in (1933) |
| July 31 | 106.0°F (1923) | 60.1°F (1965) | 1.70 in (1903) |