S
M
T
W
T
F
S
26
61°
40°
27
74°
38°
28
63°
54°
29
54°
43°
30
50°
37°
1
47°
32°
2
47°
30°
3
56°
31°
4
71°
48°
5
68°
47°
6
51°
41°
7
53°
38°
8
55°
45°
9
61°
45°
10
54°
37°
11
52°
39°
12
53°
43°
13
52°
42°
14
57°
46°
15
61°
48°
16
62°
49°
17
63°
51°
18
62°
51°
19
61°
52°
20
66°
49°
21
63°
45°
22
63°
45°
23
64°
47°
24
65°
48°
25
68°
52°
26
69°
50°
27
66°
49°
28
70°
52°
29
67°
52°
30
73°
56°
31
75°
57°
1
75°
57°
2
70°
55°
3
73°
56°
4
77°
59°
5
77°
60°
6
76°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Niagara Falls
Niagara Falls's May 2026 forecast shows daily high temperatures ranging from 52° to 77°, with overnight lows between 37° and 60°. The average high for May is 65° with an average low of 49°. 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 Niagara Falls. See also: June | July | August.
