S
M
T
W
T
F
S
27
67°
48°
28
57°
46°
29
63°
47°
30
64°
46°
1
65°
45°
2
63°
44°
3
62°
44°
4
63°
43°
5
56°
42°
6
60°
43°
7
59°
38°
8
50°
35°
9
52°
41°
10
55°
36°
11
59°
42°
12
61°
42°
13
60°
41°
14
50°
40°
15
58°
39°
16
58°
35°
17
46°
32°
18
46°
38°
19
54°
38°
20
56°
36°
21
50°
31°
22
43°
30°
23
53°
37°
24
55°
36°
25
55°
37°
26
46°
29°
27
48°
34°
28
52°
35°
29
48°
32°
30
51°
33°
31
46°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Mercer
Mercer's October 2026 forecast shows daily high temperatures ranging from 43° to 67°, with overnight lows between 29° and 48°. The average high for October is 55° with an average low of 38°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Mercer. See also: November | December | January.
