S
M
T
W
T
F
S
30
93°
71°
31
91°
67°
1
87°
63°
2
87°
61°
3
84°
59°
4
85°
62°
5
95°
59°
6
90°
72°
7
100°
75°
8
103°
78°
9
107°
80°
10
100°
78°
11
97°
73°
12
89°
68°
13
87°
67°
14
87°
65°
15
82°
64°
16
81°
65°
17
81°
64°
18
81°
64°
19
84°
64°
20
82°
64°
21
78°
67°
22
83°
66°
23
87°
63°
24
84°
64°
25
90°
64°
26
97°
63°
27
87°
71°
28
N/A
29
82°
59°
30
89°
61°
1
90°
57°
2
103°
65°
3
102°
79°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rancho Bernardo
Rancho Bernardo's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Rancho Bernardo. See also: October | November | December.
