S
M
T
W
T
F
S
28
81°
64°
29
88°
65°
30
91°
70°
1
98°
73°
2
98°
72°
3
98°
71°
4
94°
68°
5
90°
67°
6
87°
64°
7
84°
63°
8
84°
63°
9
85°
62°
10
87°
63°
11
87°
65°
12
88°
61°
13
80°
58°
14
78°
57°
15
78°
57°
16
79°
58°
17
79°
59°
18
80°
60°
19
80°
63°
20
82°
64°
21
83°
65°
22
85°
65°
23
80°
64°
24
83°
65°
25
85°
64°
26
86°
65°
27
86°
66°
28
85°
65°
29
85°
64°
30
83°
59°
31
78°
58°
1
78°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Herndon
Herndon's July 2026 forecast shows daily high temperatures ranging from 78° to 98°, with overnight lows between 57° and 73°. The average high for July is 85° with an average low of 64°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in Herndon. See also: August | September | October.
