S
M
T
W
T
F
S
30
77°
54°
31
65°
57°
1
75°
60°
2
73°
58°
3
75°
57°
4
76°
56°
5
77°
55°
6
76°
55°
7
81°
54°
8
94°
61°
9
92°
67°
10
93°
72°
11
78°
59°
12
73°
56°
13
77°
53°
14
85°
54°
15
76°
54°
16
65°
57°
17
72°
60°
18
78°
57°
19
72°
57°
20
66°
56°
21
70°
56°
22
72°
57°
23
76°
55°
24
90°
61°
25
78°
57°
26
73°
55°
27
70°
56°
28
77°
56°
29
88°
54°
30
83°
57°
1
86°
50°
2
81°
57°
3
94°
61°
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 81° to 94°, with overnight lows between 57° and 61°. The average high for September is 88° 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 San Leandro. See also: October | November | December.
