S
M
T
W
T
F
S
30
87°
65°
31
84°
64°
1
83°
61°
2
82°
59°
3
81°
57°
4
81°
61°
5
93°
59°
6
82°
70°
7
93°
75°
8
99°
71°
9
101°
70°
10
91°
67°
11
87°
65°
12
83°
61°
13
86°
63°
14
84°
63°
15
83°
64°
16
85°
65°
17
86°
65°
18
87°
64°
19
86°
66°
20
86°
64°
21
85°
60°
22
80°
59°
23
81°
59°
24
79°
58°
25
80°
60°
26
80°
60°
27
79°
59°
28
81°
60°
29
83°
61°
30
86°
62°
1
86°
62°
2
85°
61°
3
86°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bonsall
Bonsall's September 2026 forecast shows daily high temperatures ranging from 79° to 101°, with overnight lows between 58° and 71°. The average high for September is 85° with an average low of 63°. 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 Bonsall. See also: October | November | December.
