S
M
T
W
T
F
S
28
76°
69°
29
88°
68°
30
89°
68°
1
97°
73°
2
98°
75°
3
98°
78°
4
99°
74°
5
94°
72°
6
88°
73°
7
82°
73°
8
82°
71°
9
87°
72°
10
86°
68°
11
88°
70°
12
85°
66°
13
86°
62°
14
90°
64°
15
100°
75°
16
99°
72°
17
96°
73°
18
87°
73°
19
87°
68°
20
87°
70°
21
88°
67°
22
84°
63°
23
85°
65°
24
85°
64°
25
85°
65°
26
87°
67°
27
87°
68°
28
86°
67°
29
89°
65°
30
83°
69°
31
89°
70°
1
89°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Herndon Junction
Herndon Junction's July 2026 forecast shows daily high temperatures ranging from 83° to 100°, with overnight lows between 63° and 75°. The average high for July is 89° 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 Junction. See also: August | September | October.
