S
M
T
W
T
F
S
30
85°
53°
31
84°
55°
1
87°
54°
2
90°
54°
3
85°
52°
4
84°
52°
5
90°
54°
6
91°
56°
7
90°
57°
8
Hist. Avg.
86°
57°
9
Hist. Avg.
86°
57°
10
Hist. Avg.
86°
57°
11
Hist. Avg.
85°
57°
12
Hist. Avg.
85°
56°
13
Hist. Avg.
85°
56°
14
Hist. Avg.
85°
56°
15
Hist. Avg.
85°
56°
16
Hist. Avg.
84°
56°
17
Hist. Avg.
84°
56°
18
Hist. Avg.
84°
56°
19
Hist. Avg.
84°
56°
20
Hist. Avg.
84°
56°
21
Hist. Avg.
84°
55°
22
Hist. Avg.
83°
55°
23
Hist. Avg.
83°
55°
24
Hist. Avg.
83°
55°
25
Hist. Avg.
82°
55°
26
Hist. Avg.
82°
55°
27
Hist. Avg.
82°
55°
28
Hist. Avg.
82°
55°
29
Hist. Avg.
82°
55°
30
Hist. Avg.
81°
54°
1
Hist. Avg.
81°
54°
2
Hist. Avg.
81°
54°
3
Hist. Avg.
80°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Gilroy
Gilroy's September 2026 forecast shows daily high temperatures ranging from 84° to 91°, with overnight lows between 52° and 57°. The average high for September is 87° with an average low of 54°. 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 Gilroy. See also: October | November | December.
