September weather in Larkspur, CO
The average temperature in Larkspur in September is °F (°F–°F). Average precipitation: 1.85 inches.
September is a fall month in Larkspur, and is cooler than the annual average of 0°F. Daylight averages about 12h 14m.
Avg High
°F
Avg Low
°F
Precipitation
1.85 in
Daylight
12h 14m
September records in Larkspur
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| September 1 | 88.0°F (1985) | 37.9°F (1967) | 0.12 in (1966) |
| September 2 | 87.1°F (2023) | 37.9°F (1974) | 1.10 in (1983) |
| September 3 | 86.0°F (1976) | 33.1°F (1974) | 0.53 in (2021) |
| September 4 | 89.1°F (1976) | 32.0°F (1968) | 0.51 in (1968) |
| September 5 | 87.1°F (1976) | 32.0°F (1968) | 0.47 in (2024) |
| September 6 | 88.0°F (2022) | 37.0°F (1968) | 0.66 in (1981) |
| September 7 | 90.0°F (2022) | 36.0°F (1968) | 0.64 in (1976) |
| September 8 | 88.0°F (1977) | 33.1°F (1977) | 0.90 in (1969) |
| September 9 | 90.0°F (2022) | 37.0°F (1976) | 0.66 in (2020) |
| September 10 | 88.0°F (1977) | 39.9°F (1977) | 0.14 in (2022) |
| September 11 | 89.1°F (1974) | 36.0°F (1975) | 0.78 in (1973) |
| September 12 | 82.0°F (1971) | 26.1°F (1974) | 0.60 in (1985) |
| September 13 | 87.1°F (1983) | 26.1°F (1974) | 0.11 in (1969) |
| September 14 | 86.0°F (1971) | 30.9°F (1974) | 1.30 in (2009) |
| September 15 | 81.0°F (1983) | 30.9°F (1967) | 1.75 in (2011) |
| September 16 | 82.0°F (1970) | 34.0°F (1966) | 1.34 in (2009) |
| September 17 | 82.0°F (1975) | 21.0°F (1965) | 1.10 in (1971) |
| September 18 | 84.0°F (1976) | 21.9°F (1965) | 0.27 in (2025) |
| September 19 | 86.0°F (1983) | 26.1°F (1978) | 0.47 in (1965) |
| September 20 | 84.9°F (2022) | 21.0°F (1983) | 0.39 in (1965) |
| September 21 | 86.0°F (2022) | 19.9°F (1983) | 0.35 in (1979) |
| September 22 | 90.0°F (1983) | 27.0°F (1965) | 0.88 in (1970) |
| September 23 | 82.9°F (1983) | 21.9°F (1985) | 0.50 in (2025) |
| September 24 | 81.0°F (1983) | 28.0°F (1965) | 0.51 in (1981) |
| September 25 | 84.0°F (1966) | 26.1°F (1984) | 0.88 in (1970) |
| September 26 | 80.1°F (1974) | 23.0°F (1985) | 1.98 in (1973) |
| September 27 | 84.0°F (1983) | 28.9°F (1976) | 0.32 in (1967) |
| September 28 | 82.9°F (1983) | 26.1°F (1984) | 0.43 in (1966) |
| September 29 | 81.0°F (2023) | 12.0°F (1985) | 1.71 in (1973) |
| September 30 | 82.9°F (2024) | 15.1°F (1985) | 0.90 in (1973) |