S
M
T
W
T
F
S
26
61°
31°
27
65°
34°
28
68°
36°
29
73°
37°
30
77°
40°
1
77°
40°
2
80°
47°
3
84°
42°
4
82°
51°
5
82°
47°
6
82°
43°
7
83°
52°
8
74°
45°
9
78°
44°
10
75°
47°
11
76°
43°
12
81°
46°
13
70°
49°
14
66°
46°
15
56°
36°
16
53°
38°
17
71°
34°
18
65°
37°
19
69°
44°
20
74°
46°
21
76°
39°
22
75°
46°
23
82°
50°
24
82°
49°
25
82°
48°
26
64°
54°
27
79°
56°
28
96°
58°
29
81°
53°
30
71°
49°
31
64°
49°
1
64°
49°
2
78°
53°
3
78°
52°
4
81°
52°
5
84°
50°
6
81°
49°
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 64° to 96°, with overnight lows between 49° and 58°. The average high for May is 78° 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 Niagara. See also: June | July | August.
