S
M
T
W
T
F
S
30
77°
59°
31
78°
56°
1
77°
57°
2
75°
54°
3
74°
53°
4
75°
55°
5
76°
58°
6
76°
59°
7
73°
57°
8
75°
53°
9
74°
52°
10
77°
60°
11
78°
58°
12
78°
61°
13
79°
58°
14
79°
57°
15
75°
50°
16
74°
50°
17
68°
59°
18
75°
58°
19
77°
57°
20
75°
49°
21
78°
47°
22
74°
45°
23
75°
54°
24
73°
56°
25
73°
46°
26
Hist. Avg.
70°
50°
27
Hist. Avg.
69°
49°
28
Hist. Avg.
69°
49°
29
Hist. Avg.
68°
49°
30
Hist. Avg.
68°
48°
1
Hist. Avg.
68°
48°
2
Hist. Avg.
67°
47°
3
Hist. Avg.
67°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Pontiac
Pontiac's September 2026 forecast shows daily high temperatures ranging from 68° to 79°, with overnight lows between 45° and 61°. The average high for September is 75° with an average low of 55°. 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 Pontiac. See also: October | November | December.
