S
M
T
W
T
F
S
28
85°
66°
29
89°
70°
30
91°
71°
1
97°
74°
2
98°
74°
3
97°
70°
4
96°
71°
5
87°
67°
6
89°
66°
7
91°
68°
8
90°
67°
9
83°
69°
10
89°
70°
11
89°
69°
12
87°
70°
13
89°
70°
14
89°
69°
15
88°
70°
16
86°
70°
17
87°
71°
18
90°
71°
19
90°
70°
20
89°
71°
21
88°
71°
22
87°
70°
23
89°
71°
24
89°
71°
25
88°
70°
26
88°
70°
27
89°
69°
28
89°
71°
29
88°
71°
30
89°
70°
31
87°
68°
1
84°
69°
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 83° to 98°, with overnight lows between 66° and 74°. The average high for July is 89° with an average low of 70°. 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.
