S
M
T
W
T
F
S
30
83°
59°
31
84°
58°
1
83°
57°
2
83°
57°
3
82°
59°
4
84°
61°
5
85°
62°
6
85°
59°
7
83°
58°
8
80°
59°
9
82°
58°
10
81°
54°
11
79°
55°
12
79°
53°
13
80°
53°
14
78°
54°
15
77°
58°
16
77°
55°
17
82°
54°
18
80°
52°
19
78°
56°
20
80°
56°
21
82°
57°
22
82°
57°
23
80°
59°
24
77°
59°
25
Hist. Avg.
80°
57°
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 77° to 85°, with overnight lows between 52° and 62°. The average high for September is 81° with an average low of 57°. 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.
