S
M
T
W
T
F
S
26
85°
64°
27
86°
66°
28
87°
65°
29
86°
66°
30
86°
66°
31
87°
65°
1
85°
66°
2
86°
65°
3
84°
65°
4
83°
64°
5
85°
66°
6
87°
64°
7
78°
61°
8
80°
64°
9
84°
64°
10
83°
65°
11
85°
65°
12
85°
66°
13
84°
64°
14
83°
63°
15
84°
63°
16
83°
64°
17
83°
62°
18
85°
62°
19
84°
60°
20
85°
61°
21
84°
56°
22
77°
52°
23
76°
51°
24
76°
53°
25
78°
54°
26
77°
58°
27
79°
58°
28
80°
60°
29
81°
60°
30
81°
59°
31
80°
59°
1
82°
54°
2
79°
50°
3
71°
57°
4
72°
58°
5
78°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Watertown
Watertown's August 2026 forecast shows daily high temperatures ranging from 71° to 87°, with overnight lows between 50° and 66°. The average high for August is 82° with an average low of 61°. 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 Watertown. See also: September | October | November.
