As of 19:35 PDT

Fullerton, CA weather in January

85°

Fullerton, Saturday, 8 August, 19:35

Clear. Feels like 85°. High 98°, low 70°.

Pressure29.83 inHg

Wind4 mph SW

Humidity47%

Visibility6.2 mi

Dew point62°

See detailed hourly forecast

In January, Fullerton, CA averages a high of 64.5° and a low of 43.8°. About 3.4 inches of precipitation fall over the month (6 wet days). The record high is 87.8° (2021) and the record low 28° (1963). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	63.3°	41.9°	10%	79.3° (2012)	32.2° (1983)
2	63.5°	41.7°	15%	78.8° (2012)	28.8° (1960)
3	63°	42.4°	20%	78.1° (1994)	29.1° (1971)
4	63°	42.1°	20%	83.5° (2012)	28.6° (1971)
5	63.5°	43°	32%	81° (2012)	28.4° (1971)
6	63.5°	43.2°	20%	79.9° (2015)	30° (1973)
7	63.5°	43.5°	23%	81.1° (1962)	28.4° (1971)
8	63.5°	43.2°	15%	80.8° (2007)	29.7° (1989)
9	63.7°	44.1°	23%	79° (2007)	32.4° (1989)
10	64.4°	44.2°	20%	78.8° (1961)	34.3° (1972)
11	64.9°	44.1°	15%	80.1° (1996)	31.5° (1962)
12	64.9°	43.9°	15%	79.9° (1983)	30.2° (1989)
13	66.4°	43.9°	12%	79.7° (2018)	28° (1963)
14	66.6°	44.2°	17%	85.1° (2021)	28.2° (2007)
15	65.8°	45°	20%	87.8° (2021)	29.1° (2007)
16	64.9°	45.5°	25%	86.2° (1976)	29.3° (2007)
17	65.7°	45°	22%	86.4° (2021)	31.5° (1987)
18	66.4°	44.1°	13%	83.3° (1971)	31.8° (2007)
19	64.9°	45°	18%	81.5° (1975)	34.3° (1979)
20	64.4°	44.6°	17%	80.6° (2014)	30.2° (1963)
21	63.9°	44.6°	17%	78.6° (2013)	30.6° (1966)
22	64°	43.5°	20%	79.9° (2013)	31.5° (1966)
23	64.4°	43.9°	25%	78.1° (2013)	32.5° (1973)
24	65.1°	44.1°	18%	77.7° (2015)	32.4° (2002)
25	64.9°	44.2°	20%	81° (2003)	31.8° (1962)
26	64.2°	44.2°	17%	81.3° (2003)	33.3° (1989)
27	64.2°	44.2°	18%	80.2° (1976)	31.3° (1979)
28	64.8°	43.7°	18%	86° (2018)	33.6° (1999)
29	64.9°	43.3°	12%	87.3° (2018)	28.6° (1979)
30	63.9°	43.9°	18%	83.8° (2018)	31.5° (1969)
31	64°	43.7°	18%	87.6° (2003)	30.2° (2002)