S
M
T
W
T
F
S
30
77°
55°
31
64°
56°
1
73°
59°
2
70°
55°
3
77°
57°
4
74°
56°
5
73°
52°
6
76°
56°
7
90°
51°
8
96°
54°
9
89°
61°
10
95°
69°
11
81°
59°
12
69°
53°
13
75°
52°
14
85°
50°
15
77°
51°
16
66°
56°
17
73°
60°
18
78°
55°
19
68°
57°
20
64°
56°
21
71°
56°
22
73°
57°
23
71°
52°
24
91°
56°
25
79°
56°
26
69°
50°
27
68°
55°
28
77°
55°
29
87°
55°
30
84°
54°
1
82°
55°
2
85°
54°
3
91°
56°
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 82° to 91°, with overnight lows between 54° and 56°. The average high for September is 86° with an average low of 55°. 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.
