S
M
T
W
T
F
S
30
79°
58°
31
79°
57°
1
80°
51°
2
77°
50°
3
78°
49°
4
74°
54°
5
78°
54°
6
78°
55°
7
77°
48°
8
70°
46°
9
68°
50°
10
70°
54°
11
75°
46°
12
74°
55°
13
75°
54°
14
74°
53°
15
74°
53°
16
66°
48°
17
Hist. Avg.
72°
49°
18
Hist. Avg.
72°
48°
19
Hist. Avg.
71°
48°
20
Hist. Avg.
71°
48°
21
Hist. Avg.
70°
47°
22
Hist. Avg.
70°
47°
23
Hist. Avg.
69°
46°
24
Hist. Avg.
69°
46°
25
Hist. Avg.
68°
45°
26
Hist. Avg.
68°
45°
27
Hist. Avg.
68°
44°
28
Hist. Avg.
67°
44°
29
Hist. Avg.
67°
44°
30
Hist. Avg.
66°
43°
1
Hist. Avg.
66°
43°
2
Hist. Avg.
65°
42°
3
Hist. Avg.
65°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Foster
Foster's September 2026 forecast shows daily high temperatures ranging from 66° to 80°, with overnight lows between 46° and 58°. The average high for September is 75° with an average low of 52°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Foster. See also: October | November | December.
