S
M
T
W
T
F
S
26
77°
60°
27
81°
60°
28
83°
57°
29
82°
56°
30
78°
53°
31
81°
55°
1
80°
54°
2
76°
53°
3
77°
55°
4
77°
53°
5
80°
54°
6
80°
55°
7
81°
55°
8
82°
60°
9
83°
55°
10
77°
57°
11
83°
61°
12
84°
61°
13
83°
58°
14
81°
53°
15
78°
52°
16
75°
58°
17
76°
57°
18
74°
53°
19
74°
51°
20
73°
60°
21
75°
61°
22
81°
59°
23
83°
60°
24
81°
52°
25
80°
51°
26
74°
51°
27
72°
55°
28
72°
56°
29
76°
58°
30
79°
58°
31
79°
57°
1
80°
51°
2
77°
50°
3
78°
49°
4
74°
54°
5
78°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Foster
Foster's August 2026 forecast shows daily high temperatures ranging from 72° to 84°, with overnight lows between 49° and 61°. The average high for August is 78° with an average low of 56°. 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 Foster. See also: September | October | November.
