S
M
T
W
T
F
S
30
80°
61°
31
80°
61°
1
81°
60°
2
81°
61°
3
74°
61°
4
75°
60°
5
78°
60°
6
77°
61°
7
74°
61°
8
75°
60°
9
74°
60°
10
75°
61°
11
75°
59°
12
76°
58°
13
79°
58°
14
78°
59°
15
77°
59°
16
77°
58°
17
74°
61°
18
74°
59°
19
80°
61°
20
81°
60°
21
74°
56°
22
73°
57°
23
77°
57°
24
80°
58°
25
79°
59°
26
80°
58°
27
79°
53°
28
73°
53°
29
71°
55°
30
72°
56°
1
76°
55°
2
79°
58°
3
78°
60°
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 71° to 81°, with overnight lows between 53° and 61°. The average high for September is 77° with an average low of 59°. 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.
