September weather in Morro Bay, CA
The average temperature in Morro Bay in September is 63.7°F (56.0°F–71.5°F). Average precipitation: 0.09 inches.
September is a fall month in Morro Bay, and is warmer than the annual average of 59.5°F. Daily temperatures swing about 15.5°F between overnight low and afternoon high. Expect about 1 days with precipitation. Daylight averages about 12h 13m. For travel, September is one of the best months of the year to visit.
Avg High
71.5°F
Avg Low
56.0°F
Precipitation
0.09 in
Daylight
12h 13m
September records in Morro Bay
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 86.0°F (2013) | 45.0°F (1991) | 0.10 in (1965) |
| September 2 | 82.9°F (2009) | 46.0°F (1991) | 0.01 in (1991) |
| September 3 | 87.1°F (1964) | 45.0°F (1992) | 0.06 in (1968) |
| September 4 | 88.0°F (1961) | 46.9°F (1989) | 0.12 in (1998) |
| September 5 | 91.0°F (1995) | 46.0°F (1992) | 1.05 in (1978) |
| September 6 | 84.9°F (1984) | 42.1°F (1992) | 0.04 in (1969) |
| September 7 | 97.0°F (1984) | 41.0°F (1992) | 0.32 in (1969) |
| September 8 | 102.0°F (1984) | 46.0°F (1992) | 0.04 in (1985) |
| September 9 | 100.9°F (1984) | 39.9°F (2012) | 0.01 in (2024) |
| September 10 | 96.1°F (1983) | 43.0°F (1985) | 0.08 in (1975) |
| September 11 | 97.0°F (1983) | 46.0°F (1985) | 1.02 in (1976) |
| September 12 | 84.9°F (1985) | 45.0°F (1966) | 0.03 in (2023) |
| September 13 | 84.9°F (1971) | 44.1°F (1966) | 0.16 in (2009) |
| September 14 | 81.0°F (2009) | 44.1°F (1970) | 0.01 in (1978) |
| September 15 | 89.1°F (1994) | 43.0°F (1992) | 0.14 in (2015) |
| September 16 | 93.0°F (1984) | 46.0°F (1975) | 0.38 in (1989) |
| September 17 | 91.9°F (1984) | 44.1°F (1988) | 0.01 in (1964) |
| September 18 | 87.1°F (2015) | 44.1°F (1978) | 0.30 in (2022) |
| September 19 | 82.9°F (2015) | 43.0°F (1986) | 0.98 in (1959) |
| September 20 | 93.0°F (1984) | 44.1°F (1968) | 0.07 in (2000) |
| September 21 | 84.9°F (1972) | 44.1°F (1986) | 0.38 in (1990) |
| September 22 | 91.9°F (1978) | 43.0°F (1960) | 0.57 in (1967) |
| September 23 | 96.1°F (1978) | 45.0°F (1981) | 0.32 in (1986) |
| September 24 | 96.1°F (2015) | 46.0°F (1988) | 0.70 in (2025) |
| September 25 | 98.1°F (1968) | 45.0°F (1986) | 0.68 in (1982) |
| September 26 | 95.0°F (1968) | 45.0°F (1986) | 0.00 in (1959) |
| September 27 | 100.0°F (1970) | 46.9°F (1971) | 0.05 in (1986) |
| September 28 | 96.1°F (1970) | 44.1°F (1964) | 1.05 in (1989) |
| September 29 | 100.9°F (1966) | 42.1°F (1992) | 1.20 in (1976) |
| September 30 | 86.0°F (1981) | 43.0°F (1992) | 1.03 in (1983) |