S
M
T
W
T
F
S
26
70°
50°
27
71°
51°
28
69°
52°
29
64°
44°
30
62°
44°
1
65°
47°
2
72°
49°
3
66°
53°
4
69°
54°
5
67°
52°
6
68°
53°
7
70°
53°
8
75°
56°
9
74°
56°
10
72°
53°
11
76°
58°
12
78°
58°
13
78°
52°
14
68°
49°
15
70°
53°
16
74°
57°
17
79°
59°
18
77°
56°
19
73°
50°
20
69°
50°
21
70°
51°
22
74°
60°
23
76°
58°
24
80°
60°
25
81°
62°
26
82°
62°
27
80°
61°
28
79°
62°
29
81°
63°
30
80°
62°
31
76°
61°
1
83°
58°
2
77°
60°
3
78°
57°
4
77°
56°
5
78°
58°
6
82°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Johnston City
Johnston City's May 2026 forecast shows daily high temperatures ranging from 62° to 83°, with overnight lows between 44° and 63°. The average high for May is 74° with an average low of 55°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Johnston City. See also: June | July | August.
