S
M
T
W
T
F
S
30
73°
46°
31
72°
48°
1
71°
46°
2
71°
47°
3
73°
47°
4
72°
45°
5
70°
46°
6
71°
49°
7
70°
50°
8
71°
52°
9
73°
46°
10
74°
46°
11
70°
45°
12
69°
46°
13
71°
49°
14
76°
52°
15
76°
51°
16
77°
52°
17
78°
53°
18
76°
51°
19
66°
42°
20
71°
46°
21
64°
40°
22
64°
42°
23
Hist. Avg.
65°
40°
24
Hist. Avg.
65°
40°
25
Hist. Avg.
64°
39°
26
Hist. Avg.
64°
39°
27
Hist. Avg.
63°
38°
28
Hist. Avg.
63°
38°
29
Hist. Avg.
62°
37°
30
Hist. Avg.
62°
37°
1
Hist. Avg.
62°
37°
2
Hist. Avg.
61°
36°
3
Hist. Avg.
61°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Hayward
Hayward's September 2026 forecast shows daily high temperatures ranging from 64° to 78°, with overnight lows between 40° and 53°. The average high for September is 72° with an average low of 47°. 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.
