S
M
T
W
T
F
S
26
66°
39°
27
70°
39°
28
66°
45°
29
66°
48°
30
64°
39°
1
70°
37°
2
75°
43°
3
73°
46°
4
70°
50°
5
61°
46°
6
61°
46°
7
61°
46°
8
68°
43°
9
70°
52°
10
70°
46°
11
59°
43°
12
54°
39°
13
61°
37°
14
52°
43°
15
54°
39°
16
52°
43°
17
61°
39°
18
57°
43°
19
63°
41°
20
66°
54°
21
72°
52°
22
79°
46°
23
81°
50°
24
82°
52°
25
84°
57°
26
86°
57°
27
84°
59°
28
82°
61°
29
81°
54°
30
82°
52°
31
81°
55°
1
71°
55°
2
69°
49°
3
61°
53°
4
66°
48°
5
62°
49°
6
63°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in St. Gallen
St. Gallen's May 2026 forecast shows daily high temperatures ranging from 61° to 71°, with overnight lows between 48° and 55°. The average high for May is 65° 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 St. Gallen. See also: June | July | August.
