Fullerton Weather in August
Average highs run from 85°F on August 1 to 81°F on August 31, and lows from 64°F to 58°F. Normal precipitation for the month is 3.03 in over about 8 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
- 83°F
- Average low
- 61°F
- Precipitation
- 3.03 in
- Record high
- 112°FAug 5, 1934
- Record low
- 32°FAug 30, 1915
- Chance of a freeze
- 0%
- Days of 90°F or more
- 6.5
- Daylight
- 14 h 22 min to 13 h 09 min
- Cloud cover
- 50%
- Humidity
- 64%
- Dew point
- 60°F
- Wind
- 9.2 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Aug 1 | 85°F | 64°F | 105°F 1918 | 47°F 1898 | 27% | 0% |
| Aug 2 | 85°F | 64°F | 105°F 1930 | 47°F 1898 | 27% | 0% |
| Aug 3 | 84°F | 63°F | 108°F 1930 | 42°F 1915 | 27% | 0% |
| Aug 4 | 84°F | 63°F | 107°F 1934 | 39°F 1915 | 27% | 0% |
| Aug 5 | 84°F | 63°F | 112°F 1934 | 44°F 1915 | 27% | 0% |
| Aug 6 | 84°F | 63°F | 104°F 1914 | 48°F 1915 | 27% | 0% |
| Aug 7 | 84°F | 63°F | 104°F 1935 | 41°F 1989 | 27% | 0% |
| Aug 8 | 84°F | 63°F | 111°F 1934 | 41°F 1989 | 27% | 0% |
| Aug 9 | 84°F | 63°F | 106°F 1947 | 41°F 1922 | 27% | 0% |
| Aug 10 | 84°F | 63°F | 105°F 1937 | 42°F 1917 | 27% | 0% |
| Aug 11 | 84°F | 63°F | 102°F 1936 | 42°F 1902 | 27% | 0% |
| Aug 12 | 83°F | 62°F | 105°F 1936 | 38°F 1964 | 27% | 0% |
| Aug 13 | 83°F | 62°F | 104°F 1944 | 42°F 1920 | 27% | 0% |
| Aug 14 | 83°F | 62°F | 103°F 1911 | 41°F 1929 | 27% | 0% |
| Aug 15 | 83°F | 62°F | 107°F 1936 | 45°F 1929 | 27% | 0% |
| Aug 16 | 83°F | 62°F | 106°F 1937 | 44°F 1897 | 27% | 0% |
| Aug 17 | 83°F | 62°F | 107°F 1936 | 42°F 1943 | 26% | 0% |
| Aug 18 | 83°F | 61°F | 107°F 1934 | 48°F 1919 | 26% | 0% |
| Aug 19 | 83°F | 61°F | 102°F 1983 | 44°F 1940 | 26% | 0% |
| Aug 20 | 83°F | 61°F | 101°F 1942 | 36°F 1950 | 26% | 0% |
| Aug 21 | 83°F | 61°F | 104°F 1918 | 43°F 1939 | 26% | 0% |
| Aug 22 | 82°F | 61°F | 105°F 1938 | 37°F 1923 | 26% | 0% |
| Aug 23 | 82°F | 60°F | 108°F 1943 | 42°F 1911 | 25% | 0% |
| Aug 24 | 82°F | 60°F | 106°F 1936 | 37°F 1928 | 25% | 0% |
| Aug 25 | 82°F | 60°F | 103°F 1912 | 40°F 1917 | 25% | 0% |
| Aug 26 | 82°F | 60°F | 103°F 1937 | 39°F 1910 | 25% | 0% |
| Aug 27 | 82°F | 59°F | 109°F 1936 | 37°F 1906 | 25% | 0% |
| Aug 28 | 82°F | 59°F | 104°F 1913 | 35°F 1917 | 25% | 0% |
| Aug 29 | 82°F | 59°F | 102°F 1945 | 40°F 1913 | 25% | 0% |
| Aug 30 | 82°F | 58°F | 101°F 1948 | 32°F 1915 | 25% | 0% |
| Aug 31 | 81°F | 58°F | 105°F 1922 | 38°F 1918 | 24% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- August 1
- sunrise 6:27 AM, sunset 8:49 PM
- August 31
- sunrise 6:57 AM, sunset 8:06 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00253185 (Genoa 2 W), public domain. Records: NOAA GHCN-Daily, station USC00250070, 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.