S
M
T
W
T
F
S
26
55°
41°
27
55°
43°
28
54°
39°
29
54°
34°
30
50°
32°
1
54°
37°
2
66°
37°
3
70°
46°
4
59°
43°
5
50°
34°
6
47°
36°
7
61°
38°
8
69°
47°
9
64°
37°
10
58°
36°
11
66°
46°
12
68°
42°
13
70°
50°
14
72°
49°
15
71°
50°
16
66°
47°
17
68°
47°
18
71°
50°
19
70°
48°
20
64°
43°
21
65°
44°
22
64°
44°
23
64°
48°
24
65°
54°
25
67°
54°
26
68°
50°
27
72°
54°
28
74°
56°
29
76°
56°
30
76°
57°
31
77°
57°
1
72°
53°
2
76°
59°
3
79°
59°
4
78°
55°
5
68°
52°
6
67°
53°
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 47° to 79°, with overnight lows between 36° and 59°. The average high for May is 69° with an average low of 49°. 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.
