Pasadena Weather in September
Average highs run from 92°F on September 1 to 87°F on September 30, and lows from 63°F to 59°F. Normal precipitation for the month is 0.22 in over about 1 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 90°F
- Average low
- 62°F
- Precipitation
- 0.22 in
- Record high
- 98°FSep 2, 1950
- Record low
- 34°FSep 11, 1952
- Chance of a freeze
- 0%
- Days of 90°F or more
- 15.9
- Daylight
- 12 h 52 min to 11 h 51 min
- Cloud cover
- 16%
- Humidity
- 50%
- Dew point
- 50°F
- Wind
- 5.4 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Sep 1 | 92°F | 63°F | 97°F 2007 | 39°F 1964 | 2% |
| Sep 2 | 92°F | 63°F | 98°F 1950 | 40°F 2000 | 2% |
| Sep 3 | 92°F | 63°F | 97°F 2007 | 45°F 1985 | 2% |
| Sep 4 | 92°F | 63°F | 94°F 2010 | 40°F 1985 | 2% |
| Sep 5 | 92°F | 63°F | 97°F 2024 | 45°F 1970 | 2% |
| Sep 6 | 92°F | 63°F | 97°F 2024 | 44°F 1965 | 2% |
| Sep 7 | 92°F | 63°F | 94°F 2004 | 37°F 1965 | 2% |
| Sep 8 | 92°F | 63°F | 94°F 2012 | 44°F 1965 | 2% |
| Sep 9 | 91°F | 63°F | 94°F 1993 | 39°F 2010 | 2% |
| Sep 10 | 91°F | 63°F | 93°F 1993 | 39°F 1952 | 2% |
| Sep 11 | 91°F | 62°F | 92°F 1979 | 34°F 1952 | 3% |
| Sep 12 | 91°F | 62°F | 94°F 1971 | 43°F 1952 | 3% |
| Sep 13 | 91°F | 62°F | 94°F 1971 | 41°F 1966 | 3% |
| Sep 14 | 91°F | 62°F | 94°F 2014 | 43°F 2016 | 3% |
| Sep 15 | 90°F | 62°F | 94°F 2008 | 42°F 1959 | 3% |
| Sep 16 | 90°F | 62°F | 93°F 2000 | 39°F 1959 | 3% |
| Sep 17 | 90°F | 62°F | 91°F 2000 | 37°F 1977 | 4% |
| Sep 18 | 90°F | 61°F | 93°F 2016 | 38°F 1955 | 4% |
| Sep 19 | 89°F | 61°F | 92°F 2000 | 35°F 1989 | 4% |
| Sep 20 | 89°F | 61°F | 90°F 2012 | 35°F 2007 | 4% |
| Sep 21 | 89°F | 61°F | 94°F 2003 | 36°F 1988 | 4% |
| Sep 22 | 89°F | 61°F | 93°F 2003 | 37°F 2007 | 4% |
| Sep 23 | 89°F | 61°F | 96°F 2003 | 37°F 2007 | 5% |
| Sep 24 | 88°F | 60°F | 91°F 2015 | 39°F 1948 | 5% |
| Sep 25 | 88°F | 60°F | 92°F 2009 | 34°F 1948 | 5% |
| Sep 26 | 88°F | 60°F | 95°F 2003 | 35°F 1971 | 5% |
| Sep 27 | 87°F | 60°F | 97°F 2010 | 38°F 1982 | 5% |
| Sep 28 | 87°F | 60°F | 94°F 2003 | 35°F 1965 | 6% |
| Sep 29 | 87°F | 59°F | 88°F 1980 | 40°F 1998 | 6% |
| Sep 30 | 87°F | 59°F | 92°F 1980 | 37°F 1982 | 6% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:26 AM, sunset 7:18 PM
- September 30
- sunrise 6:47 AM, sunset 6:38 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00046719 (Pasadena), public domain. Records: NOAA GHCN-Daily, station USC00046006, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: 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.