S
M
T
W
T
F
S
31
75°
42°
1
78°
45°
2
80°
49°
3
83°
49°
4
67°
51°
5
78°
50°
6
67°
49°
7
68°
41°
8
73°
37°
9
76°
41°
10
78°
44°
11
79°
45°
12
82°
47°
13
81°
48°
14
83°
49°
15
85°
55°
16
84°
53°
17
83°
52°
18
83°
51°
19
83°
54°
20
83°
53°
21
86°
58°
22
83°
63°
23
71°
61°
24
71°
60°
25
75°
60°
26
78°
54°
27
79°
53°
28
84°
55°
29
80°
51°
30
82°
52°
1
74°
48°
2
77°
42°
3
80°
48°
4
83°
48°
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.
