San Diego Weather in September
Average highs run from 29°C on September 1 to 28°C on September 30, and lows from 19°C to 19°C. Normal precipitation for the month is 97 mm over about 17 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
- 29°C
- Average low
- 19°C
- Precipitation
- 97 mm
- Record high
- 40°CSep 11, 2019
- Record low
- 19°CSep 29, 1976
- Daylight
- 12 h 19 min to 12 h 03 min
- Cloud cover
- 77%
- Humidity
- 79%
- Dew point
- 19°C
- Wind
- 4.7 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 | 29°C | 19°C | 38°C 2019 | 22°C 1975 | 48% |
| Sep 2 | 29°C | 19°C | 37°C 2015 | 22°C 1975 | 47% |
| Sep 3 | 29°C | 19°C | 37°C 1977 | 22°C 1978 | 47% |
| Sep 4 | 29°C | 19°C | 37°C 1976 | 20°C 1975 | 48% |
| Sep 5 | 29°C | 19°C | 38°C 2015 | 23°C 1978 | 48% |
| Sep 6 | 29°C | 19°C | 37°C 1991 | 22°C 1975 | 50% |
| Sep 7 | 29°C | 19°C | 38°C 2015 | 20°C 1978 | 51% |
| Sep 8 | 29°C | 19°C | 38°C 1977 | 22°C 1975 | 52% |
| Sep 9 | 29°C | 19°C | 39°C 2015 | 21°C 1978 | 53% |
| Sep 10 | 29°C | 19°C | 40°C 2015 | 22°C 2004 | 54% |
| Sep 11 | 29°C | 19°C | 40°C 2019 | 22°C 2013 | 53% |
| Sep 12 | 29°C | 19°C | 39°C 2019 | 22°C 1975 | 55% |
| Sep 13 | 29°C | 19°C | 38°C 1976 | 21°C 2022 | 56% |
| Sep 14 | 29°C | 19°C | 36°C 1977 | 22°C 2022 | 57% |
| Sep 15 | 29°C | 19°C | 38°C 2019 | 22°C 1990 | 58% |
| Sep 16 | 29°C | 19°C | 37°C 2015 | 22°C 2006 | 60% |
| Sep 17 | 29°C | 19°C | 38°C 2012 | 22°C 1999 | 61% |
| Sep 18 | 29°C | 19°C | 37°C 1977 | 21°C 1977 | 62% |
| Sep 19 | 29°C | 19°C | 36°C 2024 | 22°C 1991 | 62% |
| Sep 20 | 29°C | 19°C | 37°C 1978 | 21°C 2004 | 62% |
| Sep 21 | 29°C | 19°C | 37°C 1977 | 21°C 1999 | 62% |
| Sep 22 | 29°C | 19°C | 35°C 2013 | 22°C 1975 | 61% |
| Sep 23 | 29°C | 19°C | 37°C 2015 | 21°C 1978 | 59% |
| Sep 24 | 29°C | 19°C | 37°C 2013 | 22°C 1980 | 58% |
| Sep 25 | 28°C | 19°C | 36°C 2012 | 21°C 1978 | 58% |
| Sep 26 | 28°C | 19°C | 36°C 2013 | 22°C 2022 | 58% |
| Sep 27 | 28°C | 19°C | 37°C 2015 | 22°C 1999 | 57% |
| Sep 28 | 28°C | 19°C | 35°C 2011 | 21°C 1980 | 56% |
| Sep 29 | 28°C | 19°C | 39°C 2015 | 19°C 1976 | 56% |
| Sep 30 | 28°C | 19°C | 38°C 2019 | 22°C 1976 | 55% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT-5).
- September 1
- sunrise 5:43 AM, sunset 6:02 PM
- September 30
- sunrise 5:41 AM, sunset 5:44 PM
Other months
Sources
Records: NOAA GHCN-Daily, station COM00080036, 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 2026-09-26. Sun and moon: computed with the NOAA solar equations and Meeus.