S
M
T
W
T
F
S
30
68°
61°
31
70°
61°
1
72°
54°
2
73°
52°
3
75°
61°
4
72°
61°
5
67°
51°
6
69°
52°
7
81°
60°
8
67°
53°
9
64°
49°
10
64°
49°
11
65°
54°
12
64°
50°
13
64°
49°
14
66°
50°
15
66°
51°
16
67°
52°
17
66°
50°
18
64°
47°
19
67°
50°
20
65°
51°
21
64°
51°
22
65°
52°
23
67°
52°
24
67°
51°
25
66°
50°
26
62°
48°
27
61°
44°
28
59°
43°
29
60°
44°
30
58°
49°
1
62°
47°
2
60°
45°
3
62°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grasberg
Grasberg's September 2026 forecast shows daily high temperatures ranging from 58° to 81°, with overnight lows between 43° and 60°. The average high for September is 65° 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 Grasberg. See also: October | November | December.
