S
M
T
W
T
F
S
26
81°
54°
27
85°
51°
28
82°
54°
29
83°
57°
30
83°
52°
31
90°
53°
1
77°
58°
2
76°
53°
3
85°
50°
4
92°
53°
5
90°
56°
6
95°
56°
7
92°
56°
8
91°
56°
9
87°
55°
10
84°
54°
11
86°
56°
12
82°
59°
13
84°
55°
14
82°
56°
15
77°
58°
16
83°
56°
17
84°
56°
18
87°
55°
19
88°
54°
20
93°
57°
21
80°
58°
22
78°
53°
23
80°
62°
24
92°
58°
25
85°
57°
26
83°
52°
27
78°
56°
28
79°
55°
29
75°
44°
30
78°
48°
31
83°
53°
1
73°
55°
2
64°
52°
3
69°
48°
4
68°
49°
5
74°
49°
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 64° to 83°, with overnight lows between 44° and 55°. The average high for August is 73° with an average low of 50°. 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.
