As of 15:18 PDT

South San Francisco, CA weather in December

70°

South San Francisco, Sunday, 9 August, 15:18

Partly cloudy. Feels like 70°. High 78°, low 60°.

Pressure29.83 inHg

Wind6 mph W

Humidity70%

Visibility6.2 mi

Dew point63°

See detailed hourly forecast

In December, South San Francisco, CA averages a high of 56.2° and a low of 45.8°. About 3.5 inches of precipitation fall over the month (9 wet days). The record high is 68.4° (1979) and the record low 28.4° (1990). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	58.3°	47.8°	27%	66.7° (2021)	41.9° (1971)
2	58.1°	47.3°	25%	67.1° (1986)	38.1° (2022)
3	58.5°	47.8°	35%	68.4° (1979)	38.8° (2004)
4	57.7°	47.3°	30%	65.7° (1979)	39.2° (1968)
5	57.7°	47.7°	25%	64.8° (1962)	36.7° (1972)
6	57.7°	47.5°	28%	65.7° (1962)	38.1° (2013)
7	57.7°	47.1°	28%	68° (1975)	38.3° (1978)
8	57°	46.6°	22%	66.7° (1962)	33.8° (2013)
9	57.2°	46.4°	28%	66° (1990)	29.3° (1972)
10	56.7°	46.6°	23%	64.4° (1962)	32.4° (1972)
11	56.1°	45.7°	30%	64.2° (1988)	31.1° (1972)
12	55.9°	46.4°	27%	64° (1988)	35.2° (1972)
13	55.8°	45.9°	23%	62.6° (1962)	30.4° (1972)
14	55.8°	45.7°	25%	64.4° (1962)	33.1° (1972)
15	55.9°	45.1°	30%	64.9° (1976)	35.8° (1972)
16	56.8°	44.8°	20%	65.7° (1976)	35.8° (1971)
17	56.5°	45.3°	37%	65.5° (1998)	36.3° (1965)
18	55.6°	45.3°	27%	62.1° (1969)	35.2° (1965)
19	55.8°	45.1°	25%	67.5° (1999)	37.2° (2016)
20	55°	45.1°	28%	65.7° (1999)	35.6° (1965)
21	55.2°	45.1°	38%	65.3° (1999)	30.6° (1990)
22	55°	45.3°	37%	64.8° (1999)	28.4° (1990)
23	55.8°	44.8°	23%	65.3° (2024)	28.8° (1990)
24	55.8°	45°	23%	65.1° (2013)	32.2° (1998)
25	55.8°	44.4°	27%	64.8° (1967)	35.1° (1998)
26	55°	44.6°	35%	66.2° (1980)	33.4° (1990)
27	55.2°	45°	32%	65.3° (1967)	37.4° (1990)
28	54.9°	44.8°	33%	64.6° (1975)	38.1° (1988)
29	55.4°	45.1°	33%	64.8° (2013)	36.7° (1990)
30	54.7°	45°	27%	63.5° (1963)	35.2° (1990)
31	54.9°	44.6°	25%	62.4° (1980)	32.7° (1990)