S
M
T
W
T
F
S
26
78°
66°
27
79°
68°
28
79°
65°
29
80°
67°
30
81°
68°
31
79°
63°
1
79°
69°
2
80°
70°
3
81°
64°
4
83°
63°
5
78°
64°
6
79°
63°
7
81°
63°
8
78°
64°
9
78°
69°
10
83°
68°
11
81°
66°
12
82°
68°
13
83°
69°
14
81°
70°
15
79°
69°
16
83°
62°
17
83°
62°
18
76°
63°
19
76°
63°
20
75°
64°
21
78°
61°
22
76°
66°
23
77°
67°
24
80°
69°
25
83°
68°
26
83°
59°
27
81°
59°
28
74°
60°
29
74°
60°
30
75°
64°
31
76°
66°
1
80°
67°
2
81°
65°
3
80°
61°
4
79°
65°
5
79°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Mystic
Mystic's August 2026 forecast shows daily high temperatures ranging from 74° to 83°, with overnight lows between 59° and 70°. The average high for August is 79° with an average low of 65°. 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 Mystic. See also: September | October | November.
