S
M
T
W
T
F
S
26
90°
72°
27
91°
74°
28
85°
68°
29
86°
65°
30
81°
62°
31
71°
62°
1
81°
62°
2
82°
58°
3
83°
58°
4
71°
61°
5
74°
55°
6
79°
51°
7
78°
60°
8
79°
53°
9
84°
64°
10
83°
66°
11
83°
62°
12
82°
62°
13
78°
59°
14
76°
57°
15
73°
59°
16
76°
57°
17
78°
61°
18
80°
63°
19
78°
56°
20
78°
57°
21
77°
58°
22
91°
66°
23
84°
62°
24
80°
62°
25
82°
61°
26
83°
62°
27
84°
61°
28
82°
58°
29
74°
57°
30
73°
54°
31
73°
55°
1
74°
59°
2
74°
60°
3
79°
60°
4
79°
59°
5
80°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Mason City
Mason City's August 2026 forecast shows daily high temperatures ranging from 73° to 91°, with overnight lows between 54° and 66°. The average high for August is 79° with an average low of 60°. 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 Mason City. See also: September | October | November.
