What is the highest temperature ever recorded in Fullerton, CA?

The record high temperature in Fullerton, CA is 116°F, recorded on July 6, 2018.

What is the lowest temperature ever recorded in Fullerton, CA?

The record low temperature in Fullerton, CA is 16°F, recorded on January 12, 1989.

Historical Weather in Fullerton, CA

Name: Fullerton, CA Temperature Records
Creator: NOAA

See 55+ years of weather history for any date in Fullerton going back to 1970.

Part of California weather history · California temperature records

Look Up a Specific Date

Today in Fullerton Weather HistorySee records, averages, and 55+ years of data for today's date

→

Trending Now

🌊

El Niño 2026 ForecastSuper El Niño 50% likely

🌀

Hurricane Season 202613 storms predicted

🔥

Hottest Temps Ever RecordedAll 50 states ranked

🎆

4th of July Weather History40 cities compared

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°

💧 5.9"

May

76°/ 57°

💧 6.3"

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, CA Temperature Range by Month

Average monthly highs and lows. The shaded band shows the typical daily temperature range.

Avg high Avg low

Fullerton, CA Monthly Precipitation

Average rainfall per month, in inches.

Rain (in)

Fullerton, CA Daily Temperature Calendar

Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.

Cooler

Hotter

20°40°60°80°100°

Best Time to Visit Fullerton, CA

Fullerton, CA has no months that meet our "pleasant" threshold — every season has tradeoffs.

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Pleasant (65-82°F, ≤2.5" rain) Mild Less ideal

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)