S
M
T
W
T
F
S
30
90°
49°
31
92°
50°
1
92°
50°
2
93°
51°
3
92°
50°
4
92°
53°
5
91°
52°
6
92°
53°
7
92°
53°
8
91°
51°
9
90°
50°
10
86°
52°
11
91°
53°
12
86°
51°
13
86°
51°
14
85°
47°
15
85°
46°
16
90°
48°
17
86°
49°
18
Hist. Avg.
88°
49°
19
Hist. Avg.
88°
49°
20
Hist. Avg.
88°
49°
21
Hist. Avg.
88°
48°
22
Hist. Avg.
88°
48°
23
Hist. Avg.
88°
48°
24
Hist. Avg.
88°
48°
25
Hist. Avg.
88°
48°
26
Hist. Avg.
87°
48°
27
Hist. Avg.
87°
48°
28
Hist. Avg.
87°
48°
29
Hist. Avg.
87°
47°
30
Hist. Avg.
87°
47°
1
Hist. Avg.
87°
47°
2
Hist. Avg.
86°
47°
3
Hist. Avg.
86°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Boulder Creek
Boulder Creek's September 2026 forecast shows daily high temperatures ranging from 85° to 93°, with overnight lows between 46° and 53°. The average high for September is 90° 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.
