Irwindale Weather in August
Average highs run from 86°F on August 1 to 89°F on August 31, and lows from 66°F to 65°F. Normal precipitation for the month is 0.00 in over about 0 wet days.
August day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
August at a glance
- Average high
- 88°F
- Average low
- 66°F
- Precipitation
- 0.00 in
- Record high
- 112°FAug 7, 1983
- Record low
- 47°FAug 10, 1999
- Chance of a freeze
- 0%
- Days of 90°F or more
- 17.2
- Daylight
- 13 h 50 min to 12 h 54 min
- Cloud cover
- 16%
- Humidity
- 49%
- Dew point
- 52°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 |
|---|---|---|---|---|---|
| Aug 1 | 86°F | 66°F | 104°F 1959 | 55°F 1962 | 1% |
| Aug 2 | 86°F | 66°F | 102°F 1997 | 53°F 1944 | 1% |
| Aug 3 | 86°F | 66°F | 101°F 1998 | 51°F 1944 | 1% |
| Aug 4 | 86°F | 66°F | 100°F 1997 | 52°F 1944 | 0% |
| Aug 5 | 87°F | 66°F | 108°F 1997 | 51°F 1950 | 0% |
| Aug 6 | 87°F | 66°F | 105°F 1983 | 50°F 1950 | 0% |
| Aug 7 | 87°F | 66°F | 112°F 1983 | 50°F 1950 | 0% |
| Aug 8 | 87°F | 66°F | 101°F 1965 | 53°F 1951 | 0% |
| Aug 9 | 87°F | 66°F | 102°F 2003 | 51°F 1948 | 0% |
| Aug 10 | 87°F | 66°F | 101°F 1998 | 47°F 1999 | 0% |
| Aug 11 | 87°F | 66°F | 104°F 1946 | 50°F 1950 | 0% |
| Aug 12 | 87°F | 66°F | 109°F 1994 | 51°F 1949 | 0% |
| Aug 13 | 87°F | 66°F | 106°F 1994 | 54°F 1952 | 0% |
| Aug 14 | 87°F | 66°F | 105°F 2003 | 51°F 1945 | 0% |
| Aug 15 | 88°F | 66°F | 102°F 2003 | 52°F 1945 | 0% |
| Aug 16 | 88°F | 66°F | 105°F 2003 | 51°F 1949 | 0% |
| Aug 17 | 88°F | 66°F | 104°F 1992 | 52°F 1949 | 0% |
| Aug 18 | 88°F | 66°F | 102°F 1986 | 52°F 1948 | 0% |
| Aug 19 | 88°F | 66°F | 103°F 1986 | 52°F 1948 | 0% |
| Aug 20 | 88°F | 66°F | 100°F 1969 | 53°F 1947 | 0% |
| Aug 21 | 88°F | 66°F | 103°F 1982 | 52°F 1959 | 0% |
| Aug 22 | 88°F | 66°F | 102°F 1969 | 50°F 1956 | 0% |
| Aug 23 | 88°F | 66°F | 104°F 1956 | 53°F 1948 | 0% |
| Aug 24 | 89°F | 66°F | 102°F 1985 | 52°F 1949 | 0% |
| Aug 25 | 89°F | 66°F | 106°F 1985 | 51°F 1943 | 0% |
| Aug 26 | 89°F | 66°F | 105°F 1944 | 50°F 1943 | 0% |
| Aug 27 | 89°F | 65°F | 107°F 1981 | 51°F 1953 | 1% |
| Aug 28 | 89°F | 65°F | 104°F 1981 | 52°F 1948 | 1% |
| Aug 29 | 89°F | 65°F | 105°F 1944 | 52°F 1947 | 1% |
| Aug 30 | 89°F | 65°F | 105°F 1998 | 51°F 1945 | 1% |
| Aug 31 | 89°F | 65°F | 104°F 1985 | 51°F 1941 | 1% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (PDT).
- August 1
- sunrise 6:03 AM, sunset 7:53 PM
- August 31
- sunrise 6:25 AM, sunset 7:19 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00047785 (San Gabriel Fire Dept), public domain. Records: NOAA GHCN-Daily, station USC00047785, 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.