S
M
T
W
T
F
S
30
73°
55°
31
72°
58°
1
76°
59°
2
78°
58°
3
78°
56°
4
72°
57°
5
73°
56°
6
75°
52°
7
72°
51°
8
73°
53°
9
74°
54°
10
78°
56°
11
78°
56°
12
79°
57°
13
80°
57°
14
79°
53°
15
75°
51°
16
76°
55°
17
78°
56°
18
79°
56°
19
80°
55°
20
80°
56°
21
79°
56°
22
76°
54°
23
73°
50°
24
72°
49°
25
71°
48°
26
72°
50°
27
72°
51°
28
74°
50°
29
78°
47°
30
72°
50°
1
Hist. Avg.
74°
51°
2
Hist. Avg.
74°
51°
3
Hist. Avg.
74°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Bolsa Knolls
Bolsa Knolls's September 2026 forecast shows daily high temperatures ranging from 71° to 80°, with overnight lows between 47° and 59°. The average high for September is 76° with an average low of 54°. 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 Bolsa Knolls. See also: October | November | December.
