S
M
T
W
T
F
S
28
84°
67°
29
85°
67°
30
86°
70°
1
88°
70°
2
92°
69°
3
92°
71°
4
91°
66°
5
87°
65°
6
84°
69°
7
88°
68°
8
89°
66°
9
86°
69°
10
87°
70°
11
88°
67°
12
85°
67°
13
86°
70°
14
88°
71°
15
86°
71°
16
92°
72°
17
94°
71°
18
93°
67°
19
90°
65°
20
85°
64°
21
86°
69°
22
92°
71°
23
Hist. Avg.
90°
68°
24
Hist. Avg.
90°
68°
25
Hist. Avg.
90°
67°
26
Hist. Avg.
90°
67°
27
Hist. Avg.
90°
67°
28
Hist. Avg.
90°
67°
29
Hist. Avg.
90°
67°
30
Hist. Avg.
90°
67°
31
Hist. Avg.
90°
67°
1
Hist. Avg.
90°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
July Weather in Herndon
Herndon's July 2026 forecast shows daily high temperatures ranging from 84° to 94°, with overnight lows between 64° and 72°. The average high for July is 88° with an average low of 68°. 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.
