As of 05:47 PDT

Foster City, CA weather in September

60°

Foster City, Sunday, 9 August, 05:47

Clear. Feels like 60°. High 87°, low 60°.

Pressure29.83 inHg

Wind2 mph W

Humidity90%

Visibility6.2 mi

Dew point57°

See detailed hourly forecast

In September, Foster City, CA averages a high of 74.7° and a low of 57.8°. About 0.2 inches of precipitation fall over the month (1 wet days). The record high is 105.4° (2022) and the record low 50.4° (2009). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	75.9°	58.1°	2%	101.3° (2017)	52.7° (1970)
2	75.9°	58.5°	0%	102° (2017)	53.6° (1964)
3	75.4°	58.3°	0%	91.6° (2017)	53.2° (1995)
4	75.6°	58.1°	0%	91° (2008)	52.2° (2000)
5	76.5°	58.1°	0%	92.8° (2004)	52.5° (1970)
6	76.6°	58.3°	0%	105.4° (2022)	53.4° (1980)
7	77.2°	58.6°	0%	94.6° (2020)	53.6° (2002)
8	75.7°	58.3°	2%	96.8° (1984)	53.1° (1978)
9	74.1°	58.1°	7%	91.9° (1976)	54° (1964)
10	74.5°	57.7°	3%	89.8° (1979)	52.3° (2005)
11	75.2°	58.1°	2%	96.3° (1979)	53.8° (1985)
12	74.3°	57.7°	0%	96.3° (1979)	53.4° (1966)
13	73.8°	57.7°	0%	99.1° (1971)	51.6° (1970)
14	72.3°	57.4°	2%	103.3° (1971)	52.2° (2010)
15	71.8°	57°	0%	96.8° (1971)	52° (1970)
16	72.5°	57°	7%	91.6° (1968)	52.3° (2006)
17	73.2°	57.6°	3%	94.6° (1984)	52.5° (2012)
18	73.6°	58.1°	5%	94.5° (2000)	51.8° (1978)
19	74.1°	57.6°	8%	89.6° (1995)	52.3° (1986)
20	75.4°	57.6°	3%	92.1° (2015)	51.3° (2007)
21	75°	57.7°	7%	92.8° (2003)	52.9° (1970)
22	74.1°	57.4°	2%	90.5° (2003)	53.2° (2012)
23	74.8°	57°	5%	91.2° (1978)	52° (1972)
24	75.6°	57.9°	5%	95.2° (1978)	51.3° (2018)
25	75.4°	57.9°	7%	92.8° (2019)	52.7° (1972)
26	74.8°	57.9°	2%	92.8° (1963)	50.5° (2013)
27	74.7°	57.9°	5%	92.3° (2010)	51.4° (1971)
28	74.5°	57.9°	3%	97.3° (2020)	50.7° (1971)
29	74.3°	57.4°	3%	90.9° (1999)	50.9° (2007)
30	73.9°	57.6°	8%	92.5° (1980)	50.4° (2009)