S
M
T
W
T
F
S
26
58°
30°
27
70°
30°
28
68°
57°
29
60°
48°
30
48°
40°
1
53°
29°
2
46°
34°
3
52°
37°
4
70°
46°
5
70°
45°
6
49°
43°
7
51°
38°
8
52°
34°
9
65°
38°
10
53°
42°
11
54°
29°
12
55°
29°
13
61°
43°
14
54°
46°
15
61°
49°
16
72°
56°
17
69°
50°
18
77°
67°
19
80°
63°
20
65°
46°
21
63°
49°
22
66°
51°
23
67°
51°
24
64°
52°
25
66°
55°
26
69°
51°
27
65°
53°
28
64°
52°
29
67°
56°
30
66°
56°
31
69°
53°
1
65°
50°
2
65°
51°
3
66°
49°
4
67°
51°
5
69°
58°
6
71°
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 54° to 80°, with overnight lows between 43° and 67°. The average high for May is 67° with an average low of 53°. 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.
