As of 09:39 PDT

Fountain Valley, CA weather in September

78°

Fountain Valley, Sunday, 9 August, 09:39

Mostly clear. Feels like 79°. High 95°, low 72°.

Pressure29.88 inHg

Wind4 mph W

Humidity77%

Visibility6.2 mi

Dew point70°

See detailed hourly forecast

In September, Fountain Valley, CA averages a high of 78.2° and a low of 63.6°. About 0.3 inches of precipitation fall over the month (1 wet days). The record high is 104.5° (2022) and the record low 53.1° (1978). Normals are computed over the last 60 years.

Day	High	Low	Chance of precip.	Record high	Record low
1	80.1°	64.9°	2%	93.7° (1998)	57.6° (1973)
2	80.2°	65.5°	2%	91.6° (1982)	59.7° (1966)
3	80.6°	65.3°	7%	94.1° (1988)	59.5° (1961)
4	81.3°	65.1°	2%	104.5° (2022)	58.1° (1999)
5	81°	65.1°	3%	99.1° (2024)	57.9° (1973)
6	80.8°	65.3°	2%	98.1° (2024)	58.1° (1964)
7	80.2°	64.9°	0%	90.9° (2022)	57.4° (1980)
8	79.9°	64.8°	0%	98.1° (2022)	58.1° (1980)
9	79.2°	64.9°	3%	97.9° (2022)	58.5° (1962)
10	78.3°	64.2°	5%	91.6° (1983)	57.6° (1975)
11	77.7°	63.5°	5%	92.7° (1983)	57.2° (1975)
12	77.4°	63.3°	2%	94.6° (1971)	57.4° (1962)
13	76.6°	63.3°	2%	95.5° (1971)	55.9° (2021)
14	77.2°	63°	2%	91.6° (2014)	56.5° (1970)
15	77.2°	63°	5%	92.8° (1979)	56.8° (1964)
16	77°	63.1°	5%	92.7° (2014)	57° (2006)
17	76.8°	63°	2%	89.2° (1984)	55.6° (2021)
18	76.6°	62.8°	5%	91.8° (1984)	55.8° (1993)
19	76.3°	62.8°	2%	92.1° (1984)	53.1° (1978)
20	75.9°	62.4°	10%	89.2° (2015)	56.7° (1978)
21	76.8°	62.4°	2%	86.2° (1972)	55.8° (1968)
22	78.3°	62.4°	3%	88° (1992)	55° (1964)
23	78.4°	62.4°	3%	96.4° (1975)	56.3° (1986)
24	78.4°	63°	5%	96.3° (1978)	57.6° (2007)
25	78.1°	62.8°	7%	93.9° (1963)	57.2° (1970)
26	77.4°	63°	5%	102.4° (1963)	54.7° (2024)
27	77.4°	62.6°	0%	97° (1970)	55° (2013)
28	77.4°	62.6°	3%	95.7° (1963)	54.9° (2013)
29	77.4°	62.6°	8%	93.7° (1999)	53.6° (2024)
30	77.7°	62.6°	3%	101.3° (2020)	56.1° (1965)