January weather in San Juan, TX
The average temperature in San Juan in January is 62.8°F (52.7°F–72.8°F). Average precipitation: 0.77 inches.
January is a winter month in San Juan, and is cooler than the annual average of 77.4°F. Daily temperatures swing about 20.1°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 10h 32m. For travel, January is one of the best months of the year to visit.
Avg High
72.8°F
Avg Low
52.7°F
Precipitation
0.77 in
Daylight
10h 32m
January records in San Juan
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 91.9°F (2022) | 33.1°F (1964) | 0.68 in (1973) |
| January 2 | 93.0°F (2017) | 28.0°F (1979) | 1.16 in (1973) |
| January 3 | 93.9°F (1971) | 21.9°F (1979) | 0.28 in (2007) |
| January 4 | 93.9°F (1997) | 30.0°F (1967) | 0.98 in (1970) |
| January 5 | 93.0°F (2025) | 28.9°F (1969) | 0.38 in (1970) |
| January 6 | 89.1°F (1982) | 33.1°F (1972) | 0.39 in (1973) |
| January 7 | 93.0°F (1989) | 28.9°F (1970) | 0.46 in (1986) |
| January 8 | 91.0°F (2024) | 28.9°F (1976) | 0.39 in (1986) |
| January 9 | 89.1°F (2026) | 28.0°F (1976) | 0.78 in (1973) |
| January 10 | 91.0°F (1963) | 24.1°F (1962) | 0.77 in (2015) |
| January 11 | 91.0°F (1963) | 23.0°F (1962) | 0.47 in (2003) |
| January 12 | 89.1°F (1989) | 12.9°F (1962) | 0.55 in (1977) |
| January 13 | 88.0°F (1976) | 23.0°F (1975) | 1.17 in (1987) |
| January 14 | 89.1°F (2020) | 28.0°F (1975) | 0.47 in (1966) |
| January 15 | 86.0°F (2016) | 32.0°F (1979) | 1.00 in (2008) |
| January 16 | 88.0°F (2006) | 28.2°F (2024) | 0.93 in (1988) |
| January 17 | 89.1°F (1999) | 27.1°F (2024) | 0.78 in (1978) |
| January 18 | 89.1°F (2011) | 34.0°F (1977) | 2.53 in (1978) |
| January 19 | 89.1°F (1990) | 28.9°F (1977) | 0.67 in (1981) |
| January 20 | 88.0°F (1999) | 30.9°F (1985) | 0.80 in (1994) |
| January 21 | 96.1°F (2017) | 26.1°F (1985) | 1.52 in (1994) |
| January 22 | 91.0°F (1972) | 26.2°F (2025) | 0.87 in (1975) |
| January 23 | 91.9°F (1972) | 28.9°F (1966) | 0.24 in (2007) |
| January 24 | 91.0°F (2017) | 23.0°F (1963) | 1.51 in (1984) |
| January 25 | 89.1°F (1965) | 35.1°F (2026) | 0.83 in (1984) |
| January 26 | 91.0°F (1999) | 30.0°F (2026) | 0.87 in (1992) |
| January 27 | 88.0°F (2009) | 30.0°F (1966) | 0.15 in (2017) |
| January 28 | 88.0°F (2020) | 33.1°F (1961) | 0.29 in (2022) |
| January 29 | 90.0°F (1999) | 28.0°F (1973) | 0.46 in (2014) |
| January 30 | 93.0°F (1971) | 28.9°F (1966) | 0.16 in (1976) |
| January 31 | 95.0°F (2016) | 36.0°F (1979) | 0.76 in (1984) |