S
M
T
W
T
F
S
26
64°
29°
27
64°
32°
28
66°
35°
29
54°
39°
30
61°
43°
1
47°
37°
2
52°
34°
3
43°
38°
4
56°
32°
5
71°
38°
6
55°
46°
7
54°
39°
8
51°
37°
9
57°
33°
10
55°
42°
11
55°
35°
12
46°
28°
13
59°
31°
14
63°
44°
15
64°
48°
16
75°
43°
17
65°
44°
18
63°
39°
19
59°
52°
20
83°
45°
21
50°
36°
22
N/A
23
65°
36°
24
67°
45°
25
54°
47°
26
66°
49°
27
60°
42°
28
59°
42°
29
57°
40°
30
59°
43°
31
63°
44°
1
60°
44°
2
62°
45°
3
68°
49°
4
70°
50°
5
69°
47°
6
70°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Grand Falls Portage
Grand Falls Portage's May 2026 forecast shows daily high temperatures ranging from 54° to 70°, with overnight lows between 36° and 50°. The average high for May is 63° with an average low of 45°. 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 Portage. See also: June | July | August.
