S
M
T
W
T
F
S
26
56°
38°
27
58°
39°
28
58°
46°
29
54°
42°
30
55°
42°
1
48°
37°
2
47°
35°
3
57°
35°
4
58°
46°
5
62°
44°
6
50°
37°
7
50°
39°
8
54°
37°
9
57°
41°
10
58°
43°
11
52°
43°
12
50°
40°
13
60°
42°
14
53°
44°
15
67°
45°
16
58°
44°
17
72°
45°
18
78°
52°
19
73°
54°
20
67°
50°
21
54°
47°
22
58°
46°
23
52°
44°
24
52°
44°
25
66°
51°
26
71°
58°
27
71°
54°
28
66°
49°
29
66°
49°
30
60°
51°
31
68°
50°
1
64°
52°
2
67°
55°
3
67°
56°
4
71°
57°
5
69°
57°
6
68°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Niagara
Niagara's May 2026 forecast shows daily high temperatures ranging from 60° to 71°, with overnight lows between 49° and 58°. 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 Niagara. See also: June | July | August.
