S
M
T
W
T
F
S
30
88°
54°
31
89°
53°
1
88°
52°
2
87°
52°
3
87°
54°
4
89°
56°
5
89°
58°
6
90°
54°
7
88°
54°
8
85°
55°
9
87°
54°
10
85°
50°
11
83°
51°
12
83°
48°
13
84°
48°
14
82°
49°
15
82°
53°
16
83°
50°
17
87°
49°
18
84°
48°
19
82°
51°
20
84°
53°
21
86°
52°
22
86°
51°
23
84°
54°
24
81°
54°
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 81° to 90°, with overnight lows between 48° and 58°. The average high for September is 86° with an average low of 52°. 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.
