Basile Morin / CC BY-SA 4.0
Downey, CA Weather on September 4
September 4th in Downey, CA typically brings hot fall weather, with average highs around 91°F and lows near 65°F — a 26°F daily swing. Over 55 years of records, the warmest September 4th was in 2007 (91°F average), while the coldest was 1985 (67°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 2% of September 4th dates historically. The last decade has been 1.0°F warmer on this date compared to 20-30 years ago.
What to Expect on September 4
Planning for September 4th in Downey, CA? Stay hydrated and seek shade during peak afternoon hours.
September 4 Weather Records for Downey
- •The all-time record high for September 4th in Downey, CA is 110°F, set in 2007.
- •The coldest September 4th on record dropped to 57°F in 2010.
- •Temperatures have reached 90°F or higher on September 4th in 32 of the last 55 years.
- •Last year (1971), September 4th was 5°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest September 4 ever in Downey?
The warmest September 4 in Downey, CA reached 110°F in 2007. That is 19°F above the long-term average high of 91°F.
What was the coldest September 4 ever in Downey?
The coldest September 4 in Downey, CA dropped to 57°F in 2010. That is 8°F below the long-term average low of 65°F.
What is the average temperature on September 4 in Downey?
On September 4, Downey averages a high of 91°F and a low of 65°F based on 55 years of NOAA weather observations from MONTEBELLO.
How many years of weather data are available for September 4 in Downey?
We have 55 years of weather records for September 4 in Downey, CA, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
September 4 Weather History in Downey
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 93°F | 64°F | -- | -- |
| 2024 | 98°F | 69°F | -- | -- |
| 2023 | 80°F | 59°F | -- | -- |
| 2022 | 103°F | 75°F | -- | -- |
| 2021 | 97°F | 61°F | -- | -- |
| 2020 | 96°F | 64°F | -- | -- |
| 2019 | 101°F | 74°F | -- | -- |
| 2018 | 79°F | 64°F | -- | -- |
| 2017 | 84°F | 66°F | -- | -- |
| 2016 | 75°F | 65°F | 0" | -- |
| 2015 | 83°F | 60°F | -- | -- |
| 2014 | 86°F | 61°F | -- | -- |
| 2013 | 98°F | 75°F | -- | -- |
| 2012 | 94°F | 68°F | 0" | -- |
| 2011 | 91°F | 59°F | -- | -- |
| 2010 | 97°F | 57°F | 0" | -- |
| 2009 | 100°F | 66°F | -- | -- |
| 2008 | 93°F | 65°F | -- | -- |
| 2007 | 110°F | 73°F | 0" | -- |
| 2006 | 98°F | 74°F | -- | -- |
| 2005 | 90°F | -- | 0" | -- |
| 2004 | 94°F | -- | 0" | -- |
| 2003 | 94°F | 64°F | 0" | -- |
| 2002 | 94°F | 62°F | -- | -- |
| 2001 | 90°F | 64°F | 0" | -- |
| 2000 | 87°F | 59°F | 0" | -- |
| 1999 | 82°F | 62°F | 0" | -- |
| 1998 | 79°F | 77°F | 0" | -- |
| 1997 | 101°F | 74°F | 0" | -- |
| 1996 | 86°F | 65°F | 0" | -- |
| 1995 | 95°F | 67°F | 0" | -- |
| 1994 | 89°F | 66°F | 0" | -- |
| 1993 | 94°F | 66°F | 0" | -- |
| 1992 | 82°F | 61°F | 0" | -- |
| 1991 | 88°F | 62°F | 0" | -- |
| 1990 | 96°F | 62°F | 0" | -- |
| 1989 | 90°F | 64°F | 0" | -- |
| 1988 | 110°F | 70°F | 0" | -- |
| 1987 | 94°F | 64°F | 0" | -- |
| 1986 | 87°F | 60°F | 0" | -- |
| 1985 | 75°F | 59°F | 0.27" | -- |
| 1984 | 104°F | 69°F | 0" | -- |
| 1983 | 90°F | 64°F | 0" | -- |
| 1982 | 99°F | 72°F | 0" | -- |
| 1981 | 87°F | 60°F | 0" | -- |
| 1980 | 86°F | 58°F | 0" | -- |
| 1979 | 88°F | 61°F | 0" | -- |
| 1978 | 91°F | 70°F | 0" | -- |
| 1977 | 87°F | 64°F | 0" | -- |
| 1976 | 94°F | 70°F | 0" | -- |
| 1975 | 89°F | 64°F | 0" | -- |
| 1974 | 87°F | 66°F | 0" | -- |
| 1973 | 71°F | 64°F | 0" | -- |
| 1972 | 91°F | 69°F | 0" | -- |
| 1971 | 86°F | 65°F | 0" | -- |
Based on 55 years of data from NOAA station: MONTEBELLO
Monthly Climate Averages
Historical temperature and precipitation averages for Downey, CA, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.