Santa Cruz Weather in September
Average highs run from 18°C on September 1 to 20°C on September 30, and lows from 7°C to 8°C. Normal precipitation for the month is 37 mm over about 4 wet days.
September day by day
The normal high and low for each date, and the record, in °C.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 19°C
- Average low
- 7°C
- Precipitation
- 37 mm
- Record high
- 28°CSep 25, 2013
- Record low
- -4°CSep 19, 1957
- Daylight
- 11 h 23 min to 12 h 25 min
- Cloud cover
- 52%
- Humidity
- 68%
- Dew point
- 6°C
- Wind
- 7.6 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 18°C | 7°C | 23°C 1976 | -2°C 1974 | 21% |
| Sep 2 | 18°C | 7°C | 24°C 2024 | -3°C 1966 | 20% |
| Sep 3 | 18°C | 7°C | 23°C 1982 | -2°C 1964 | 20% |
| Sep 4 | 18°C | 7°C | 26°C 1988 | -1°C 1976 | 19% |
| Sep 5 | 18°C | 7°C | 25°C 1994 | 0°C 1958 | 18% |
| Sep 6 | 18°C | 7°C | 23°C 2015 | -3°C 1973 | 18% |
| Sep 7 | 18°C | 7°C | 25°C 2022 | -2°C 1975 | 17% |
| Sep 8 | 18°C | 7°C | 24°C 1968 | -2°C 1973 | 18% |
| Sep 9 | 18°C | 7°C | 27°C 1994 | -1°C 1968 | 18% |
| Sep 10 | 18°C | 7°C | 24°C 2013 | -2°C 1968 | 17% |
| Sep 11 | 18°C | 7°C | 22°C 1964 | 0°C 1957 | 16% |
| Sep 12 | 18°C | 7°C | 25°C 1983 | -1°C 1965 | 15% |
| Sep 13 | 19°C | 7°C | 25°C 1983 | -2°C 1957 | 15% |
| Sep 14 | 19°C | 7°C | 22°C 1976 | -1°C 1968 | 13% |
| Sep 15 | 19°C | 7°C | 24°C 1993 | 0°C 1968 | 13% |
| Sep 16 | 19°C | 7°C | 24°C 1998 | 1°C 2013 | 12% |
| Sep 17 | 19°C | 7°C | 26°C 1996 | -2°C 2013 | 12% |
| Sep 18 | 20°C | 7°C | 25°C 1976 | -1°C 1973 | 12% |
| Sep 19 | 20°C | 8°C | 22°C 2020 | -4°C 1957 | 12% |
| Sep 20 | 20°C | 8°C | 22°C 1996 | 0°C 1966 | 12% |
| Sep 21 | 20°C | 8°C | 24°C 1999 | 1°C 2019 | 11% |
| Sep 22 | 20°C | 8°C | 25°C 2020 | 1°C 1981 | 11% |
| Sep 23 | 20°C | 8°C | 24°C 1973 | -1°C 1967 | 12% |
| Sep 24 | 20°C | 8°C | 25°C 1996 | -1°C 1957 | 11% |
| Sep 25 | 20°C | 8°C | 28°C 2013 | -1°C 1993 | 10% |
| Sep 26 | 20°C | 8°C | 24°C 2019 | 1°C 1993 | 10% |
| Sep 27 | 20°C | 8°C | 26°C 2019 | 1°C 1980 | 10% |
| Sep 28 | 20°C | 8°C | 23°C 2000 | -1°C 2013 | 10% |
| Sep 29 | 20°C | 8°C | 23°C 1994 | -1°C 2013 | 11% |
| Sep 30 | 20°C | 8°C | 26°C 1996 | 0°C 1979 | 11% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-3).
- September 1
- sunrise 7:04 AM, sunset 6:27 PM
- September 30
- sunrise 7:23 AM, sunset 7:48 PM
Other months
Sources
Records: NOAA GHCN-Daily, station CI000085629, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-27. Sun and moon: computed with the NOAA solar equations and Meeus.