S
M
T
W
T
F
S
26
89°
72°
27
94°
73°
28
97°
72°
29
96°
73°
30
97°
74°
31
98°
74°
1
97°
73°
2
96°
73°
3
97°
72°
4
89°
68°
5
87°
72°
6
87°
64°
7
90°
70°
8
96°
73°
9
97°
72°
10
97°
73°
11
96°
71°
12
94°
67°
13
90°
67°
14
86°
59°
15
84°
62°
16
86°
66°
17
93°
68°
18
95°
74°
19
96°
71°
20
94°
62°
21
91°
67°
22
94°
71°
23
96°
61°
24
83°
64°
25
88°
62°
26
85°
66°
27
88°
62°
28
87°
63°
29
84°
58°
30
81°
58°
31
83°
64°
1
89°
67°
2
91°
69°
3
91°
64°
4
80°
56°
5
79°
58°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Mattawa
Mattawa's August 2026 forecast shows daily high temperatures ranging from 79° to 98°, with overnight lows between 56° and 74°. The average high for August is 91° with an average low of 67°. 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 Mattawa. See also: September | October | November.
