S
M
T
W
T
F
S
26
66°
38°
27
73°
38°
28
70°
52°
29
61°
50°
30
50°
41°
1
54°
31°
2
46°
35°
3
53°
38°
4
71°
47°
5
71°
45°
6
48°
42°
7
52°
35°
8
54°
38°
9
64°
38°
10
55°
40°
11
55°
34°
12
56°
36°
13
64°
44°
14
52°
43°
15
59°
46°
16
76°
44°
17
77°
57°
18
89°
60°
19
83°
66°
20
68°
51°
21
58°
36°
22
71°
39°
23
65°
44°
24
57°
49°
25
68°
53°
26
N/A
27
74°
51°
28
63°
49°
29
63°
48°
30
61°
44°
31
67°
46°
1
68°
48°
2
73°
51°
3
75°
54°
4
76°
54°
5
74°
57°
6
75°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Black River
Black River's May 2026 forecast shows daily high temperatures ranging from 61° to 76°, with overnight lows between 44° and 57°. The average high for May is 70° with an average low of 51°. 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 Black River. See also: June | July | August.
