San Francisco De Borja Weather in September
Average highs run from 22°C on September 1 to 22°C on September 30, and lows from 13°C to 14°C. Normal precipitation for the month is 0 mm over about 0 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
- 22°C
- Average low
- 14°C
- Precipitation
- 0 mm
- Record high
- 28°CSep 17, 1978
- Record low
- 13°CSep 20, 1999
- Daylight
- 11 h 52 min to 12 h 12 min
- Cloud cover
- 58%
- Humidity
- 62%
- Dew point
- 9°C
- Wind
- 12.6 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 | 22°C | 13°C | 25°C 1997 | 13°C 1973 | 0% |
| Sep 2 | 22°C | 13°C | 26°C 1997 | 13°C 1975 | 0% |
| Sep 3 | 22°C | 13°C | 25°C 1997 | 13°C 1975 | 0% |
| Sep 4 | 22°C | 13°C | 24°C 2023 | 13°C 1966 | 0% |
| Sep 5 | 22°C | 13°C | 24°C 2015 | 14°C 2007 | 0% |
| Sep 6 | 22°C | 14°C | 23°C 2015 | 14°C 2007 | 0% |
| Sep 7 | 22°C | 14°C | 25°C 1997 | 13°C 1973 | 0% |
| Sep 8 | 22°C | 14°C | 25°C 1997 | 14°C 1966 | 0% |
| Sep 9 | 22°C | 14°C | 23°C 1993 | 13°C 1975 | 0% |
| Sep 10 | 22°C | 14°C | 22°C 2015 | 13°C 1967 | 0% |
| Sep 11 | 22°C | 14°C | 23°C 1983 | 14°C 1965 | 0% |
| Sep 12 | 22°C | 14°C | 22°C 1984 | 13°C 1990 | 0% |
| Sep 13 | 22°C | 14°C | 22°C 1983 | 13°C 1973 | 0% |
| Sep 14 | 22°C | 14°C | 22°C 1986 | 13°C 1981 | 0% |
| Sep 15 | 22°C | 14°C | 22°C 1983 | 14°C 2003 | 0% |
| Sep 16 | 22°C | 14°C | 22°C 1983 | 13°C 1973 | 0% |
| Sep 17 | 22°C | 14°C | 28°C 1978 | 13°C 2001 | 0% |
| Sep 18 | 22°C | 14°C | 22°C 2016 | 14°C 2007 | 0% |
| Sep 19 | 22°C | 14°C | 23°C 1997 | 14°C 2001 | 0% |
| Sep 20 | 22°C | 14°C | 23°C 2004 | 13°C 1999 | 1% |
| Sep 21 | 22°C | 14°C | 23°C 1987 | 13°C 1973 | 1% |
| Sep 22 | 22°C | 14°C | 25°C 1997 | 14°C 1965 | 1% |
| Sep 23 | 22°C | 14°C | 24°C 1994 | 14°C 2007 | 1% |
| Sep 24 | 22°C | 14°C | 26°C 1997 | 14°C 2007 | 1% |
| Sep 25 | 22°C | 14°C | 23°C 1983 | 14°C 1966 | 1% |
| Sep 26 | 22°C | 14°C | 25°C 1997 | 13°C 1966 | 1% |
| Sep 27 | 22°C | 14°C | 25°C 1997 | 13°C 2001 | 1% |
| Sep 28 | 22°C | 14°C | 24°C 1997 | 14°C 2001 | 1% |
| Sep 29 | 22°C | 14°C | 23°C 1997 | 14°C 1988 | 1% |
| Sep 30 | 22°C | 14°C | 24°C 2015 | 14°C 2001 | 1% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-5).
- September 1
- sunrise 6:12 AM, sunset 6:04 PM
- September 30
- sunrise 5:52 AM, sunset 6:04 PM
Other months
Sources
Records: NOAA GHCN-Daily, station PEM00084628, 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.