S
M
T
W
T
F
S
28
78°
67°
29
86°
69°
30
92°
73°
1
97°
77°
2
101°
77°
3
101°
74°
4
96°
73°
5
95°
72°
6
92°
68°
7
88°
70°
8
87°
68°
9
88°
68°
10
91°
69°
11
92°
70°
12
91°
67°
13
83°
63°
14
81°
63°
15
81°
62°
16
82°
63°
17
82°
65°
18
83°
65°
19
83°
69°
20
85°
70°
21
86°
70°
22
88°
69°
23
84°
70°
24
85°
70°
25
88°
69°
26
89°
70°
27
89°
70°
28
88°
69°
29
87°
69°
30
86°
64°
31
81°
63°
1
81°
63°
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 81° to 101°, with overnight lows between 62° and 77°. The average high for July is 88° with an average low of 69°. 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.
