S
M
T
W
T
F
S
30
72°
48°
31
79°
45°
1
71°
45°
2
72°
47°
3
70°
53°
4
74°
52°
5
78°
51°
6
78°
52°
7
68°
45°
8
67°
44°
9
68°
44°
10
69°
49°
11
75°
51°
12
74°
52°
13
66°
52°
14
68°
53°
15
66°
51°
16
66°
51°
17
67°
46°
18
66°
50°
19
64°
46°
20
66°
43°
21
67°
42°
22
65°
43°
23
64°
43°
24
68°
47°
25
71°
49°
26
Hist. Avg.
68°
50°
27
Hist. Avg.
67°
49°
28
Hist. Avg.
67°
49°
29
Hist. Avg.
66°
49°
30
Hist. Avg.
66°
49°
1
Hist. Avg.
66°
48°
2
Hist. Avg.
65°
48°
3
Hist. Avg.
65°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Black Diamond
Black Diamond's September 2026 forecast shows daily high temperatures ranging from 64° to 79°, with overnight lows between 42° and 53°. The average high for September is 70° with an average low of 48°. 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 Black Diamond. See also: October | November | December.
