S
M
T
W
T
F
S
31
77°
45°
1
76°
46°
2
72°
46°
3
58°
39°
4
52°
38°
5
49°
39°
6
57°
37°
7
58°
36°
8
69°
37°
9
61°
55°
10
68°
48°
11
65°
46°
12
71°
44°
13
79°
53°
14
79°
54°
15
81°
57°
16
82°
61°
17
81°
57°
18
72°
57°
19
67°
57°
20
66°
54°
21
69°
57°
22
73°
54°
23
65°
55°
24
68°
42°
25
75°
41°
26
67°
44°
27
69°
39°
28
74°
34°
29
82°
40°
30
78°
46°
1
74°
54°
2
79°
55°
3
80°
52°
4
83°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mercer
Mercer's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Mercer. See also: October | November | December.
