S
M
T
W
T
F
S
26
84°
52°
27
85°
53°
28
84°
52°
29
78°
50°
30
77°
48°
31
79°
50°
1
79°
51°
2
84°
55°
3
86°
56°
4
84°
54°
5
84°
55°
6
87°
55°
7
87°
54°
8
86°
55°
9
86°
53°
10
85°
50°
11
78°
52°
12
79°
50°
13
78°
49°
14
81°
51°
15
80°
54°
16
77°
51°
17
76°
51°
18
80°
52°
19
82°
51°
20
84°
53°
21
79°
49°
22
79°
49°
23
77°
48°
24
80°
52°
25
78°
53°
26
76°
53°
27
75°
49°
28
82°
47°
29
85°
50°
30
82°
45°
31
77°
43°
1
75°
44°
2
76°
48°
3
78°
45°
4
83°
43°
5
80°
52°
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 75° to 87°, with overnight lows between 43° and 56°. The average high for August is 81° with an average low of 51°. 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.
