September weather in San Juan Bautista, CA
The average temperature in San Juan Bautista in September is 66.8°F (52.6°F–80.9°F). Average precipitation: 0.05 inches.
September is a fall month in San Juan Bautista, and is warmer than the annual average of 58.6°F. Daily temperatures swing about 28.3°F between overnight low and afternoon high. Expect about 0 days with precipitation. Daylight averages about 12h 13m. For travel, September is a comfortable month to visit.
Avg High
80.9°F
Avg Low
52.6°F
Precipitation
0.05 in
Daylight
12h 13m
September records in San Juan Bautista
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 108.0°F (2017) | 46.0°F (1999) | 0.02 in (1983) |
| September 2 | 109.9°F (2017) | 46.0°F (1990) | 0.00 in (1948) |
| September 3 | 98.1°F (2009) | 46.9°F (1989) | 0.00 in (1948) |
| September 4 | 102.9°F (1988) | 48.0°F (1982) | 0.00 in (1948) |
| September 5 | 104.0°F (2020) | 46.9°F (1981) | 0.00 in (1948) |
| September 6 | 111.0°F (2020) | 45.0°F (2001) | 0.00 in (1948) |
| September 7 | 109.0°F (2020) | 48.0°F (1988) | 0.00 in (1948) |
| September 8 | 102.0°F (2004) | 46.0°F (1992) | 0.01 in (1999) |
| September 9 | 102.9°F (1984) | 45.0°F (1983) | 0.08 in (1985) |
| September 10 | 100.9°F (2015) | 37.9°F (2021) | 0.00 in (1948) |
| September 11 | 105.1°F (1983) | 46.0°F (1985) | 0.28 in (1976) |
| September 12 | 105.1°F (1983) | 44.1°F (1985) | 0.00 in (1948) |
| September 13 | 99.0°F (2019) | 46.0°F (1990) | 0.00 in (1948) |
| September 14 | 96.1°F (1983) | 44.1°F (1980) | 0.17 in (2009) |
| September 15 | 99.0°F (1994) | 45.0°F (1992) | 0.00 in (1948) |
| September 16 | 102.0°F (1984) | 45.0°F (1980) | 0.25 in (1989) |
| September 17 | 102.9°F (2000) | 39.9°F (1988) | 0.41 in (1989) |
| September 18 | 98.1°F (2016) | 44.1°F (1988) | 0.12 in (1989) |
| September 19 | 99.0°F (2000) | 45.0°F (1988) | 0.09 in (1984) |
| September 20 | 98.1°F (2003) | 45.0°F (2004) | 0.01 in (2004) |
| September 21 | 102.0°F (2003) | 45.0°F (1980) | 0.00 in (1948) |
| September 22 | 100.0°F (2015) | 45.0°F (1981) | 0.00 in (1948) |
| September 23 | 104.0°F (1997) | 43.0°F (1993) | 0.63 in (1990) |
| September 24 | 100.0°F (1985) | 42.1°F (1981) | 0.71 in (1982) |
| September 25 | 100.0°F (2010) | 44.1°F (2005) | 0.22 in (2014) |
| September 26 | 100.9°F (1993) | 46.0°F (2013) | 0.30 in (1982) |
| September 27 | 104.0°F (2010) | 15.1°F (2016) | 1.23 in (1976) |
| September 28 | 105.1°F (2010) | 45.0°F (1982) | 0.65 in (1976) |
| September 29 | 98.1°F (1988) | 45.0°F (1981) | 1.41 in (1976) |
| September 30 | 102.0°F (1980) | 42.1°F (1982) | 1.30 in (1983) |