S
M
T
W
T
F
S
26
58°
30°
27
70°
30°
28
68°
57°
29
59°
45°
30
51°
37°
1
49°
37°
2
48°
35°
3
50°
41°
4
56°
48°
5
57°
45°
6
58°
50°
7
53°
45°
8
52°
41°
9
53°
46°
10
54°
44°
11
55°
45°
12
56°
46°
13
60°
42°
14
63°
46°
15
62°
43°
16
61°
45°
17
61°
44°
18
65°
53°
19
66°
53°
20
69°
52°
21
72°
54°
22
69°
50°
23
63°
53°
24
69°
49°
25
63°
46°
26
65°
50°
27
66°
55°
28
65°
56°
29
70°
55°
30
67°
51°
31
67°
48°
1
65°
47°
2
65°
48°
3
66°
49°
4
65°
49°
5
66°
50°
6
67°
52°
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 48° to 72°, with overnight lows between 35° and 56°. The average high for May is 61° 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.
