S
M
T
W
T
F
S
30
87°
63°
31
87°
62°
1
86°
62°
2
87°
61°
3
88°
62°
4
87°
62°
5
87°
63°
6
88°
64°
7
89°
62°
8
86°
63°
9
85°
62°
10
85°
62°
11
84°
63°
12
85°
63°
13
87°
64°
14
89°
64°
15
88°
63°
16
86°
62°
17
87°
61°
18
85°
63°
19
85°
63°
20
Hist. Avg.
87°
60°
21
Hist. Avg.
87°
60°
22
Hist. Avg.
86°
60°
23
Hist. Avg.
86°
60°
24
Hist. Avg.
86°
60°
25
Hist. Avg.
86°
60°
26
Hist. Avg.
85°
60°
27
Hist. Avg.
85°
59°
28
Hist. Avg.
84°
59°
29
Hist. Avg.
84°
59°
30
Hist. Avg.
84°
59°
1
Hist. Avg.
84°
59°
2
Hist. Avg.
83°
59°
3
Hist. Avg.
83°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Bonsall
Bonsall's September 2026 forecast shows daily high temperatures ranging from 84° to 89°, with overnight lows between 61° and 64°. The average high for September is 87° 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.
