S
M
T
W
T
F
S
26
61°
44°
27
66°
45°
28
64°
49°
29
55°
41°
30
53°
36°
1
48°
37°
2
57°
42°
3
64°
41°
4
70°
41°
5
53°
35°
6
50°
35°
7
50°
36°
8
55°
39°
9
60°
39°
10
63°
42°
11
61°
44°
12
63°
45°
13
63°
47°
14
62°
45°
15
68°
47°
16
68°
53°
17
72°
52°
18
66°
51°
19
70°
53°
20
69°
53°
21
67°
44°
22
62°
43°
23
63°
45°
24
64°
44°
25
64°
46°
26
65°
46°
27
64°
47°
28
65°
46°
29
66°
51°
30
67°
57°
31
72°
52°
1
69°
54°
2
73°
57°
3
75°
58°
4
77°
58°
5
78°
59°
6
77°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Watertown
Watertown's May 2026 forecast shows daily high temperatures ranging from 50° to 78°, with overnight lows between 35° and 60°. The average high for May is 65° with an average low of 47°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Watertown. See also: June | July | August.
