S
M
T
W
T
F
S
26
81°
57°
27
82°
60°
28
77°
64°
29
73°
54°
30
67°
45°
1
63°
43°
2
61°
40°
3
64°
41°
4
67°
47°
5
71°
49°
6
71°
52°
7
70°
49°
8
72°
50°
9
69°
46°
10
70°
47°
11
70°
46°
12
75°
54°
13
75°
54°
14
71°
50°
15
69°
49°
16
68°
47°
17
69°
47°
18
71°
48°
19
72°
54°
20
74°
56°
21
75°
55°
22
76°
56°
23
76°
57°
24
77°
58°
25
78°
58°
26
75°
55°
27
74°
52°
28
74°
52°
29
75°
53°
30
75°
56°
31
77°
56°
1
79°
59°
2
79°
61°
3
80°
61°
4
78°
60°
5
77°
61°
6
78°
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 61° to 82°, with overnight lows between 40° and 64°. The average high for May is 73° 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.
