S
M
T
W
T
F
S
30
85°
65°
31
82°
67°
1
88°
71°
2
92°
71°
3
88°
66°
4
81°
67°
5
79°
64°
6
77°
58°
7
78°
58°
8
82°
69°
9
87°
71°
10
74°
61°
11
77°
62°
12
81°
66°
13
82°
66°
14
83°
71°
15
81°
64°
16
74°
60°
17
72°
61°
18
69°
54°
19
67°
53°
20
71°
55°
21
70°
54°
22
73°
59°
23
72°
58°
24
76°
58°
25
76°
57°
26
77°
58°
27
75°
58°
28
76°
59°
29
76°
59°
30
77°
58°
1
76°
57°
2
74°
52°
3
72°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Oliver
Mount Oliver's September 2026 forecast shows daily high temperatures ranging from 67° to 87°, with overnight lows between 47° and 71°. The average high for September is 76° with an average low of 60°. 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 Mount Oliver. See also: October | November | December.
