S
M
T
W
T
F
S
26
85°
56°
27
87°
56°
28
84°
60°
29
76°
63°
30
77°
63°
31
82°
62°
1
87°
61°
2
84°
64°
3
83°
61°
4
85°
56°
5
87°
57°
6
91°
61°
7
91°
70°
8
85°
66°
9
85°
64°
10
84°
62°
11
81°
60°
12
81°
56°
13
80°
57°
14
77°
52°
15
75°
50°
16
78°
47°
17
80°
67°
18
84°
64°
19
81°
60°
20
78°
57°
21
81°
52°
22
81°
51°
23
70°
62°
24
76°
56°
25
N/A
26
79°
54°
27
79°
65°
28
76°
46°
29
75°
47°
30
78°
59°
31
77°
60°
1
72°
56°
2
72°
56°
3
71°
54°
4
72°
55°
5
74°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in St. Johnsbury
St. Johnsbury's August 2026 forecast shows daily high temperatures ranging from 71° to 79°, with overnight lows between 46° and 65°. The average high for August is 75° 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 August weather will actually feel in St. Johnsbury. See also: September | October | November.
