S
M
T
W
T
F
S
26
59°
39°
27
63°
41°
28
52°
39°
29
55°
34°
30
59°
34°
1
61°
34°
2
61°
46°
3
48°
45°
4
59°
41°
5
52°
39°
6
54°
37°
7
57°
43°
8
59°
45°
9
52°
37°
10
57°
34°
11
54°
37°
12
57°
45°
13
52°
39°
14
52°
39°
15
52°
34°
16
55°
32°
17
55°
41°
18
55°
43°
19
59°
48°
20
59°
45°
21
64°
48°
22
66°
54°
23
66°
55°
24
72°
52°
25
75°
45°
26
66°
50°
27
N/A
28
74°
58°
29
65°
49°
30
66°
54°
31
65°
52°
1
64°
54°
2
63°
49°
3
62°
51°
4
61°
50°
5
61°
48°
6
61°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Grangemouth
Grangemouth's May 2026 forecast shows daily high temperatures ranging from 61° to 74°, with overnight lows between 47° and 58°. The average high for May is 64° 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 Grangemouth. See also: June | July | August.
