S
M
T
W
T
F
S
30
77°
54°
31
65°
57°
1
71°
57°
2
75°
60°
3
73°
58°
4
74°
57°
5
74°
55°
6
73°
56°
7
79°
58°
8
79°
61°
9
86°
63°
10
85°
61°
11
79°
59°
12
75°
58°
13
74°
59°
14
75°
56°
15
75°
58°
16
71°
57°
17
77°
58°
18
76°
56°
19
70°
53°
20
73°
58°
21
74°
55°
22
76°
55°
23
70°
56°
24
69°
52°
25
68°
53°
26
67°
52°
27
68°
51°
28
68°
51°
29
69°
52°
30
69°
55°
1
68°
51°
2
69°
53°
3
76°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in San Leandro
San Leandro's September 2026 forecast shows daily high temperatures ranging from 67° to 86°, with overnight lows between 51° and 63°. The average high for September is 73° with an average low of 56°. 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 San Leandro. See also: October | November | December.
