S
M
T
W
T
F
S
26
57°
42°
27
55°
42°
28
53°
43°
29
54°
42°
30
53°
44°
1
55°
42°
2
54°
36°
3
55°
39°
4
59°
42°
5
58°
42°
6
58°
44°
7
63°
42°
8
58°
41°
9
59°
49°
10
62°
50°
11
61°
50°
12
63°
49°
13
69°
50°
14
66°
46°
15
61°
44°
16
63°
47°
17
65°
53°
18
73°
54°
19
72°
43°
20
61°
43°
21
62°
44°
22
63°
45°
23
64°
50°
24
70°
55°
25
74°
56°
26
71°
55°
27
66°
55°
28
67°
54°
29
67°
51°
30
68°
56°
31
74°
56°
1
69°
55°
2
69°
49°
3
70°
51°
4
72°
49°
5
75°
52°
6
78°
47°
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 53° to 78°, with overnight lows between 36° and 56°. The average high for May is 64° with an average low of 48°. 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.
