S
M
T
W
T
F
S
30
78°
63°
31
85°
56°
1
83°
50°
2
83°
57°
3
86°
59°
4
79°
64°
5
76°
63°
6
84°
56°
7
80°
58°
8
73°
63°
9
75°
48°
10
76°
40°
11
83°
58°
12
70°
47°
13
66°
34°
14
62°
55°
15
70°
36°
16
69°
49°
17
72°
49°
18
67°
56°
19
72°
55°
20
70°
52°
21
69°
50°
22
72°
51°
23
73°
50°
24
72°
51°
25
74°
51°
26
75°
52°
27
72°
51°
28
63°
49°
29
67°
50°
30
68°
48°
1
70°
47°
2
67°
47°
3
67°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Hayward
Hayward's September 2026 forecast shows daily high temperatures ranging from 62° to 75°, with overnight lows between 36° and 56°. The average high for September is 70° 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 September weather will actually feel in Hayward. See also: October | November | December.
