S
M
T
W
T
F
S
26
82°
69°
27
81°
68°
28
81°
70°
29
82°
70°
30
82°
69°
31
81°
70°
1
82°
69°
2
81°
68°
3
78°
69°
4
78°
70°
5
80°
70°
6
81°
69°
7
81°
69°
8
80°
70°
9
81°
68°
10
83°
70°
11
82°
69°
12
84°
69°
13
82°
68°
14
83°
70°
15
77°
68°
16
80°
71°
17
79°
66°
18
79°
68°
19
Hist. Avg.
73°
66°
20
Hist. Avg.
74°
66°
21
Hist. Avg.
74°
66°
22
Hist. Avg.
74°
66°
23
Hist. Avg.
74°
66°
24
Hist. Avg.
74°
66°
25
Hist. Avg.
74°
65°
26
Hist. Avg.
74°
65°
27
Hist. Avg.
74°
65°
28
Hist. Avg.
74°
65°
29
Hist. Avg.
74°
65°
30
Hist. Avg.
74°
65°
31
Hist. Avg.
74°
65°
1
Hist. Avg.
74°
65°
2
Hist. Avg.
74°
65°
3
Hist. Avg.
74°
65°
4
Hist. Avg.
74°
65°
5
Hist. Avg.
74°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Fountain Valley
Fountain Valley's August 2026 forecast shows daily high temperatures ranging from 77° to 84°, with overnight lows between 66° and 71°. The average high for August is 81° with an average low of 69°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Fountain Valley. See also: September | October | November.
