Imperial Weather in September
Average highs run from 104°F on September 1 to 95°F on September 30, and lows from 77°F to 68°F. Normal precipitation for the month is 0.26 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
- 100°F
- Average low
- 73°F
- Precipitation
- 0.26 in
- Record high
- 121°FSep 5, 2020
- Record low
- 54°FSep 20, 1965
- Chance of a freeze
- 0%
- Days of 90°F or more
- 28.8
- Daylight
- 12 h 50 min to 11 h 52 min
- Cloud cover
- 21%
- Humidity
- 31%
- Dew point
- 50°F
- Wind
- 7.6 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 | 104°F | 77°F | 116°F 1969 | 64°F 1966 | 4% |
| Sep 2 | 104°F | 77°F | 112°F 2010 | 60°F 2000 | 4% |
| Sep 3 | 103°F | 77°F | 115°F 2010 | 62°F 1964 | 4% |
| Sep 4 | 103°F | 77°F | 114°F 2020 | 62°F 2004 | 4% |
| Sep 5 | 103°F | 76°F | 121°F 2020 | 62°F 2004 | 4% |
| Sep 6 | 103°F | 76°F | 118°F 2020 | 64°F 1970 | 4% |
| Sep 7 | 103°F | 76°F | 113°F 2020 | 66°F 1965 | 4% |
| Sep 8 | 102°F | 76°F | 114°F 2011 | 61°F 1965 | 4% |
| Sep 9 | 102°F | 76°F | 115°F 1968 | 61°F 1965 | 4% |
| Sep 10 | 102°F | 75°F | 113°F 1968 | 60°F 2010 | 4% |
| Sep 11 | 102°F | 75°F | 115°F 1971 | 64°F 2020 | 4% |
| Sep 12 | 101°F | 75°F | 118°F 1971 | 61°F 1965 | 4% |
| Sep 13 | 101°F | 74°F | 113°F 1971 | 65°F 1972 | 4% |
| Sep 14 | 101°F | 74°F | 113°F 1971 | 63°F 1970 | 4% |
| Sep 15 | 100°F | 74°F | 113°F 2000 | 58°F 1970 | 4% |
| Sep 16 | 100°F | 73°F | 110°F 1962 | 61°F 1970 | 4% |
| Sep 17 | 100°F | 73°F | 112°F 1962 | 57°F 2006 | 4% |
| Sep 18 | 99°F | 73°F | 111°F 1962 | 59°F 2006 | 4% |
| Sep 19 | 99°F | 72°F | 112°F 1962 | 58°F 1965 | 4% |
| Sep 20 | 99°F | 72°F | 109°F 2010 | 54°F 1965 | 4% |
| Sep 21 | 98°F | 72°F | 108°F 2003 | 54°F 1978 | 4% |
| Sep 22 | 98°F | 71°F | 112°F 1966 | 55°F 1978 | 3% |
| Sep 23 | 98°F | 71°F | 111°F 1966 | 55°F 1968 | 3% |
| Sep 24 | 97°F | 71°F | 111°F 2002 | 57°F 1968 | 3% |
| Sep 25 | 97°F | 70°F | 110°F 1963 | 55°F 2017 | 3% |
| Sep 26 | 97°F | 70°F | 110°F 2010 | 54°F 1970 | 3% |
| Sep 27 | 96°F | 69°F | 111°F 2009 | 55°F 2013 | 3% |
| Sep 28 | 96°F | 69°F | 109°F 1963 | 55°F 1971 | 3% |
| Sep 29 | 95°F | 68°F | 110°F 1969 | 55°F 1965 | 3% |
| Sep 30 | 95°F | 68°F | 108°F 1969 | 54°F 1965 | 3% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:17 AM, sunset 7:07 PM
- September 30
- sunrise 6:36 AM, sunset 6:28 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00044223 (Imperial), public domain. Records: NOAA GHCN-Daily, station USW00003144, 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.