S
M
T
W
T
F
S
27
67°
60°
28
71°
61°
29
74°
60°
30
81°
56°
1
86°
61°
2
88°
59°
3
69°
60°
4
64°
58°
5
73°
45°
6
64°
40°
7
70°
45°
8
78°
50°
9
79°
49°
10
73°
48°
11
72°
52°
12
71°
50°
13
71°
47°
14
67°
46°
15
69°
45°
16
64°
45°
17
70°
50°
18
69°
50°
19
68°
49°
20
69°
45°
21
60°
40°
22
59°
42°
23
59°
41°
24
66°
46°
25
69°
47°
26
69°
39°
27
56°
36°
28
57°
38°
29
60°
45°
30
58°
44°
31
61°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Herndon
Herndon's October 2026 forecast shows daily high temperatures ranging from 56° to 88°, with overnight lows between 36° and 60°. The average high for October is 67° with an average low of 46°. 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 Herndon. See also: November | December | January.
