As of 15:18 PDT

South San Francisco, CA weather in September

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 September, South San Francisco, CA averages a high of 71.5° and a low of 57.1°. About 0.2 inches of precipitation fall over the month (1 wet days). The record high is 100.8° (2017) and the record low 49.6° (1970). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	72.3°	57.4°	3%	100.4° (2017)	52.9° (1970)
2	72.5°	57.7°	0%	100.8° (2017)	53.4° (1964)
3	72°	57.6°	0%	88.3° (1961)	52.5° (1973)
4	72°	57.4°	0%	85.5° (1961)	53.2° (1960)
5	72.7°	57.4°	0%	86.7° (2004)	53.2° (1969)
6	72.7°	57.2°	0%	98.2° (2022)	53.4° (1980)
7	73.2°	57.7°	0%	85.3° (2004)	53.4° (2011)
8	72.1°	57.6°	2%	90.3° (1984)	53.1° (2002)
9	70.7°	57.4°	7%	86.2° (1976)	53.4° (1965)
10	71.2°	57°	3%	84.4° (1979)	52.7° (1985)
11	71.8°	57.4°	2%	90.9° (1979)	54.3° (1961)
12	71.1°	57.2°	0%	89.2° (1979)	52.9° (1988)
13	70.7°	57.2°	2%	91.6° (1971)	52.5° (2005)
14	69.3°	56.8°	2%	95.5° (1971)	51.4° (1970)
15	69.3°	56.5°	0%	90° (1971)	49.6° (1970)
16	69.8°	56.8°	7%	87.8° (1968)	51.3° (2006)
17	70.3°	57°	3%	88° (1984)	51.8° (2012)
18	70.9°	57.6°	5%	89.6° (2000)	52.3° (2008)
19	71.1°	56.8°	5%	84.4° (2002)	51.8° (1988)
20	72.1°	57°	3%	88.7° (1983)	50° (2018)
21	72°	56.7°	5%	86.4° (2003)	51.4° (1968)
22	70.9°	56.7°	2%	85.3° (1964)	51.1° (2012)
23	71.8°	56.1°	2%	88.3° (2024)	51.4° (1981)
24	72.5°	56.7°	3%	89.4° (1978)	49.8° (2018)
25	72.3°	57°	7%	91.6° (2019)	51.8° (2018)
26	71.8°	56.8°	0%	88.7° (1970)	51.3° (1988)
27	71.8°	57.2°	5%	87.6° (1973)	50.9° (1986)
28	71.4°	57°	5%	92.7° (2020)	52.5° (1986)
29	71.2°	56.7°	2%	86.5° (1999)	51.6° (2019)
30	71.1°	56.7°	5%	87.8° (1980)	50.5° (2007)