S
M
T
W
T
F
S
26
40°
27°
27
41°
20°
28
56°
17°
29
63°
21°
30
56°
22°
1
57°
27°
2
60°
42°
3
54°
42°
4
45°
39°
5
62°
39°
6
64°
45°
7
63°
48°
8
49°
41°
9
52°
29°
10
61°
27°
11
54°
38°
12
46°
37°
13
45°
36°
14
65°
35°
15
54°
39°
16
47°
42°
17
68°
43°
18
48°
34°
19
56°
37°
20
55°
38°
21
53°
40°
22
53°
36°
23
54°
38°
24
52°
38°
25
53°
37°
26
52°
41°
27
53°
40°
28
54°
38°
29
54°
38°
30
55°
38°
31
55°
39°
1
56°
40°
2
56°
42°
3
57°
40°
4
56°
38°
5
55°
38°
6
56°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Grand Falls-Windsor
Grand Falls-Windsor's May 2026 forecast shows daily high temperatures ranging from 47° to 68°, with overnight lows between 34° and 43°. The average high for May is 54° with an average low of 39°. 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 Grand Falls-Windsor. See also: June | July | August.
