S
M
T
W
T
F
S
26
68°
38°
27
57°
41°
28
62°
47°
29
71°
40°
30
81°
44°
1
72°
48°
2
66°
47°
3
91°
50°
4
72°
52°
5
65°
52°
6
70°
54°
7
72°
52°
8
68°
47°
9
78°
47°
10
71°
50°
11
81°
48°
12
80°
52°
13
62°
51°
14
62°
49°
15
60°
43°
16
60°
44°
17
63°
43°
18
70°
43°
19
71°
46°
20
72°
48°
21
80°
48°
22
72°
45°
23
68°
46°
24
71°
48°
25
65°
45°
26
65°
47°
27
67°
48°
28
67°
47°
29
69°
49°
30
67°
48°
31
63°
45°
1
71°
52°
2
73°
53°
3
72°
53°
4
71°
50°
5
68°
46°
6
72°
53°
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 63° to 80°, with overnight lows between 43° and 53°. The average high for May is 69° 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. See also: June | July | August.
