S
M
T
W
T
F
S
28
92°
70°
29
91°
71°
30
92°
72°
1
93°
72°
2
93°
71°
3
91°
72°
4
92°
70°
5
91°
71°
6
87°
71°
7
87°
72°
8
88°
72°
9
87°
71°
10
88°
71°
11
88°
70°
12
89°
73°
13
91°
73°
14
90°
72°
15
89°
73°
16
89°
72°
17
90°
71°
18
90°
71°
19
89°
72°
20
89°
71°
21
90°
72°
22
90°
72°
23
89°
71°
24
89°
72°
25
90°
72°
26
89°
73°
27
90°
73°
28
89°
72°
29
89°
73°
30
90°
73°
31
93°
72°
1
94°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in Johnston
Johnston's July 2026 forecast shows daily high temperatures ranging from 87° to 94°, with overnight lows between 70° and 73°. The average high for July is 90° with an average low of 72°. 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 Johnston. See also: August | September | October.
