S
M
T
W
T
F
S
26
62°
44°
27
57°
45°
28
60°
42°
29
58°
45°
30
64°
46°
1
60°
45°
2
61°
44°
3
60°
44°
4
60°
45°
5
63°
48°
6
68°
50°
7
67°
49°
8
61°
48°
9
61°
49°
10
62°
50°
11
70°
51°
12
70°
52°
13
71°
52°
14
70°
53°
15
67°
43°
16
66°
43°
17
66°
45°
18
68°
49°
19
70°
45°
20
69°
46°
21
65°
52°
22
71°
53°
23
72°
53°
24
72°
54°
25
73°
53°
26
68°
51°
27
74°
51°
28
74°
50°
29
73°
52°
30
73°
48°
31
74°
50°
1
74°
56°
2
71°
57°
3
77°
55°
4
78°
55°
5
79°
58°
6
78°
58°
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 57° to 79°, with overnight lows between 42° and 58°. The average high for May is 68° with an average low of 50°. 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.
