S
M
T
W
T
F
S
30
82°
60°
31
82°
57°
1
81°
57°
2
80°
56°
3
79°
54°
4
78°
54°
5
78°
54°
6
79°
58°
7
79°
58°
8
80°
55°
9
79°
54°
10
79°
55°
11
78°
57°
12
78°
59°
13
79°
61°
14
84°
60°
15
84°
60°
16
83°
59°
17
82°
60°
18
83°
60°
19
84°
59°
20
83°
60°
21
83°
57°
22
82°
56°
23
81°
57°
24
80°
58°
25
81°
59°
26
Hist. Avg.
80°
57°
27
Hist. Avg.
80°
57°
28
Hist. Avg.
80°
57°
29
Hist. Avg.
79°
57°
30
Hist. Avg.
79°
57°
1
Hist. Avg.
79°
56°
2
Hist. Avg.
79°
56°
3
Hist. Avg.
78°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in San Jose
San Jose's September 2026 forecast shows daily high temperatures ranging from 78° to 84°, with overnight lows between 54° and 61°. The average high for September is 81° with an average low of 58°. 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 Jose. See also: October | November | December.
