S
M
T
W
T
F
S
30
90°
71°
31
92°
69°
1
87°
65°
2
85°
63°
3
82°
60°
4
82°
65°
5
94°
63°
6
90°
77°
7
100°
74°
8
99°
74°
9
99°
72°
10
96°
69°
11
89°
68°
12
88°
65°
13
88°
64°
14
87°
66°
15
88°
65°
16
88°
65°
17
88°
67°
18
87°
66°
19
87°
65°
20
86°
62°
21
81°
62°
22
81°
61°
23
82°
61°
24
81°
60°
25
81°
62°
26
82°
61°
27
80°
60°
28
82°
62°
29
84°
63°
30
86°
63°
1
86°
62°
2
85°
63°
3
85°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Jamul
Jamul's September 2026 forecast shows daily high temperatures ranging from 80° to 100°, with overnight lows between 60° and 74°. The average high for September is 87° with an average low of 65°. 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 Jamul. See also: October | November | December.
