| Month | Average (°F) | Record (°F) | Average (inches) | |||
|---|---|---|---|---|---|---|
| High ☀️ | Low 🌙 | High ☀️ | Low 🌙 | Precipitation 💧 | Snow ❄️ | |
| January | 62.7 | 39.5 | 89 | -2 | 2.4 | 0.0 |
| February | 67.9 | 42.3 | 99 | 5 | 1.7 | 0.1 |
| March | 73.6 | 50.8 | 100 | 17 | 2.7 | 0.0 |
| April | 80.2 | 57.0 | 102 | 30 | 3.1 | 0.0 |
| May | 86.3 | 65.2 | 106 | 40 | 4.7 | 0.0 |
| June | 92.7 | 71.9 | 109 | 51 | 3.6 | 0.0 |
| July | 95.7 | 73.8 | 110 | 56 | 2.3 | 0.0 |
| August | 97.1 | 73.5 | 111 | 50 | 2.4 | 0.0 |
| September | 90.7 | 68.3 | 111 | 39 | 4.1 | 0.0 |
| October | 82.5 | 58.4 | 101 | 27 | 4.3 | 0.0 |
| November | 71.6 | 48.2 | 98 | 17 | 2.5 | 0.0 |
| December | 64.1 | 41.3 | 91 | 4 | 2.4 | 0.0 |
| Entire year | 80.7 | 58.1 | 111 | -2 | 36.2 | 0.1 |
|
More San Marcos Weather Records
1893–2024
|
||
|---|---|---|
| Highest daily low | 81 °F | August 31, 2020 |
| Lowest daily high | 21 °F | January 26, 1897 |
| Greatest daily range (Difference of high and low) |
65 °F | March 21, 1923 |
| Greatest difference in daily high over two conscutive days |
49 °F | Mar 26–27, 1955 |
| Most daily precipitation | 15.8 inches | October 17, 1998 |
| Most monthly precipitation | 25.3 inches | October 1998 |
| Most yearly precipitation | 58.5 inches | 1998 |
| Most yearly days with precipitation | 119 | 2007 |
| Earliest snow in season | December 8 | 2017 |
| Latest snow in season | March 9 | 1915 |
| Most daily snow | 6.0 inches | January 24, 1926 |
| Most monthly snow | 10.0 inches | December 1929 |
| Most yearly snow | 10.0 inches | 1929 |
| Most snow in a winter | 10.0 inches | 1929–1930 |
| Greatest snow accumulation | 4.0 inches | February 23, 1966 |
| Earliest freeze | October 30 | 1980 |
| Earliest day ≥ 100 °F | March 30 | 1925 |
| Latest freeze | April 10 | 1938 |
| Latest day ≥ 100 °F | October 10 | 1926 |
| Most days in a year < 0 °F | 1 | 1949 |
| Most days in a year < 32 °F | 47 | 1978 |
| Most days in a year ≥ 80 °F | 248 | 1933 |
| Most days in a year ≥ 90 °F | 161 | 1948 |
| Most days in a year ≥ 100 °F | 95 | 1925 |
| Most days in a year ≥ 110 °F | 2 | 2000 |
|
San Marcos Weather Streaks
Most consecutive days...
|
||
|---|---|---|
| With precipitation | 14 days | Apr 16–29, 1957 |
| Without precipitation | 106 days | Oct 2, 1921 – Jan 15, 1922 |
| With snow | 3 days | Dec 21–23, 1929 |
| High temperature at or below freezing |
4 days | Jan 30 – Feb 2, 1951 |
| High temperature ≥ 80 °F | 174 days | Apr 23 – Oct 13, 1923 |
| High temperature ≥ 90 °F | 100 days | Jun 1 – Sep 8, 2009 |
| High temperature ≥ 100 °F | 45 days | Jul 8 – Aug 21, 2023 |
| Years | Station | Coordinates |
|---|---|---|
| 1893–2024 | San Marcos | location |