S
M
T
W
T
F
S
30
85°
68°
31
N/A
1
86°
65°
2
84°
68°
3
85°
69°
4
87°
68°
5
86°
68°
6
86°
63°
7
79°
65°
8
81°
63°
9
79°
58°
10
75°
56°
11
75°
53°
12
78°
59°
13
78°
59°
14
78°
58°
15
78°
57°
16
77°
55°
17
77°
57°
18
78°
57°
19
76°
55°
20
76°
56°
21
77°
57°
22
78°
57°
23
78°
56°
24
77°
56°
25
77°
55°
26
76°
55°
27
77°
54°
28
76°
54°
29
75°
53°
30
75°
54°
1
74°
54°
2
75°
53°
3
74°
52°
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 74° to 87°, with overnight lows between 52° and 69°. The average high for September is 78° with an average low of 58°. 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.
