S
M
T
W
T
F
S
27
76°
47°
28
76°
46°
29
69°
53°
30
69°
53°
1
68°
54°
2
70°
52°
3
69°
46°
4
66°
49°
5
65°
50°
6
66°
50°
7
67°
44°
8
65°
44°
9
71°
49°
10
Hist. Avg.
67°
45°
11
Hist. Avg.
66°
44°
12
Hist. Avg.
66°
44°
13
Hist. Avg.
66°
44°
14
Hist. Avg.
65°
43°
15
Hist. Avg.
65°
43°
16
Hist. Avg.
65°
43°
17
Hist. Avg.
64°
42°
18
Hist. Avg.
64°
42°
19
Hist. Avg.
64°
42°
20
Hist. Avg.
63°
41°
21
Hist. Avg.
63°
41°
22
Hist. Avg.
63°
41°
23
Hist. Avg.
62°
41°
24
Hist. Avg.
62°
40°
25
Hist. Avg.
61°
40°
26
Hist. Avg.
61°
40°
27
Hist. Avg.
61°
40°
28
Hist. Avg.
60°
39°
29
Hist. Avg.
60°
39°
30
Hist. Avg.
60°
39°
31
Hist. Avg.
59°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
October Weather in Mercersburg
Mercersburg's October 2026 forecast shows daily high temperatures ranging from 65° to 76°, with overnight lows between 44° and 54°. The average high for October is 69° with an average low of 49°. 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 Mercersburg. See also: November | December | January.
