September weather in Mission Viejo, CA
The average temperature in Mission Viejo in September is 69.7°F (58.5°F–81.0°F). Average precipitation: 0.16 inches.
September is a fall month in Mission Viejo, and is warmer than the annual average of 63.1°F. Daily temperatures swing about 22.5°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 12m. For travel, September is a comfortable month to visit.
Avg High
81.0°F
Avg Low
58.5°F
Precipitation
0.16 in
Daylight
12h 12m
September records in Mission Viejo
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 100.9°F (1955) | 43.0°F (1928) | 0.14 in (1967) |
| September 2 | 102.9°F (1955) | 46.9°F (1928) | 0.13 in (1967) |
| September 3 | 97.0°F (2007) | 48.0°F (1989) | 0.10 in (1998) |
| September 4 | 97.0°F (1961) | 48.9°F (1985) | 0.50 in (1963) |
| September 5 | 93.9°F (1984) | 48.0°F (1949) | 0.45 in (1978) |
| September 6 | 102.0°F (2004) | 46.9°F (1949) | 1.69 in (1978) |
| September 7 | 93.9°F (1984) | 44.1°F (1978) | 0.00 in (1928) |
| September 8 | 88.0°F (1949) | 39.9°F (1978) | 0.04 in (1945) |
| September 9 | 91.0°F (1983) | 39.9°F (1950) | 0.01 in (1972) |
| September 10 | 95.0°F (2004) | 43.0°F (1950) | 1.14 in (1976) |
| September 11 | 95.0°F (1959) | 45.0°F (1950) | 0.55 in (1976) |
| September 12 | 97.0°F (1959) | 46.9°F (1928) | 0.12 in (1939) |
| September 13 | 90.0°F (1937) | 43.0°F (1950) | 0.00 in (1928) |
| September 14 | 87.1°F (1960) | 46.0°F (1985) | 0.10 in (1978) |
| September 15 | 95.0°F (1983) | 46.0°F (1985) | 0.05 in (1982) |
| September 16 | 104.0°F (1983) | 45.0°F (1985) | 0.13 in (1982) |
| September 17 | 93.9°F (1939) | 45.0°F (1985) | 1.17 in (1963) |
| September 18 | 97.0°F (1939) | 44.1°F (1928) | 0.53 in (1929) |
| September 19 | 93.9°F (1939) | 42.1°F (1950) | 0.47 in (1989) |
| September 20 | 100.0°F (1939) | 39.9°F (1950) | 0.20 in (2005) |
| September 21 | 106.0°F (1939) | 43.0°F (1950) | 0.04 in (1947) |
| September 22 | 100.0°F (1939) | 44.1°F (1950) | 0.90 in (2007) |
| September 23 | 104.0°F (1939) | 43.0°F (1950) | 0.50 in (1934) |
| September 24 | 102.0°F (1978) | 45.0°F (1950) | 0.52 in (1986) |
| September 25 | 100.9°F (1978) | 46.0°F (1977) | 2.00 in (1939) |
| September 26 | 108.0°F (1963) | 43.0°F (1948) | 0.25 in (1977) |
| September 27 | 106.0°F (1963) | 44.1°F (1948) | 0.08 in (1983) |
| September 28 | 104.0°F (1963) | 44.1°F (1928) | 0.23 in (1951) |
| September 29 | 95.0°F (1970) | 45.0°F (1948) | 0.03 in (1966) |
| September 30 | 91.0°F (1999) | 46.0°F (1948) | 1.00 in (1983) |