S
M
T
W
T
F
S
30
82°
49°
31
77°
55°
1
72°
53°
2
76°
55°
3
74°
52°
4
75°
51°
5
77°
48°
6
87°
49°
7
93°
50°
8
90°
54°
9
89°
55°
10
91°
53°
11
91°
52°
12
89°
52°
13
87°
53°
14
89°
49°
15
87°
52°
16
83°
50°
17
89°
51°
18
87°
50°
19
82°
47°
20
84°
52°
21
84°
50°
22
87°
50°
23
82°
49°
24
81°
45°
25
80°
45°
26
79°
46°
27
80°
45°
28
80°
46°
29
81°
45°
30
81°
48°
1
80°
45°
2
81°
47°
3
87°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Boulder Creek
Boulder Creek's September 2026 forecast shows daily high temperatures ranging from 72° to 93°, with overnight lows between 45° and 55°. The average high for September is 83° with an average low of 50°. 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 Boulder Creek. See also: October | November | December.
