Historical Weather in Fullerton, CA
See 55+ years of weather history for any date in Fullerton going back to 1970.
Part of California weather history
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Today in Fullerton Weather HistorySee records, averages, and 55+ years of data for today's date
→Monthly Climate Averages
Historical temperature and precipitation averages for Fullerton, CA, based on 55+ years of weather data.
Warmest MonthAugustAvg High: 88°F / Low: 65°F
Coldest MonthDecemberAvg High: 69°F / Low: 46°F
Jan
70°/ 47°
💧 12.4"
Feb
70°/ 48°
💧 12.5"
Mar
72°/ 50°
💧 9.2"
Apr
74°/ 52°
💧 6.0"
May
76°/ 57°
💧 6.4"
Jun
81°/ 60°
💧 2.6"
Jul
86°/ 64°
💧 4.3"
Aug
88°/ 65°
💧 9.3"
Sep
86°/ 63°
💧 4.7"
Oct
81°/ 58°
💧 6.0"
Nov
75°/ 51°
💧 8.1"
Dec
69°/ 46°
💧 9.2"
Temperatures in Fahrenheit. Precipitation and snowfall in inches.
Fullerton Temperature Records
- Record High: The hottest temperature ever recorded in Fullerton, CA is 116°F, set on July 6, 2018.
- Record Low: The coldest temperature ever recorded in Fullerton, CA is 16°F, set on January 12, 1989.
- Data Coverage: Based on 37 years of data from NOAA weather station: ANAHEIM.
All-Time Record High
116°F
July 6, 2018
All-Time Record Low
16°F
January 12, 1989
Monthly Temperature Records in Fullerton
| Month | Record High | Record Low |
|---|---|---|
| January | 96°F(2003) | 16°F(1989) |
| February | 97°F(2016) | 22°F(1989) |
| March | 98°F(2015) | 36°F(1971) |
| April | 106°F(2004) | 34°F(1975) |
| May | 106°F(2004) | 39°F(1971) |
| June | 109°F(1981) | 45°F(1999) |
| July | 116°F(2018) | 50°F(2005) |
| August | 109°F(2020) | 51°F(2010) |
| September | 114°F(2010) | 49°F(2005) |
| October | 108°F(2017) | 37°F(1971) |
| November | 102°F(2010) | 33°F(1994) |
| December | 92°F(1979) | 24°F(1988) |
Fullerton Snow RecordsSee the top 10 snowiest days ever recorded
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