18.05
mon
mon
Day
54°F
SE 10 mph
Precip.
100%
100%
Night
43°F
N 5 mph
Precip.
0%
0%
19.05
tue
tue
Day
55°F
S 3 mph
Precip.
74%
74%
Night
48°F
N 4 mph
Precip.
0%
0%
20.05
wed
wed
Day
59°F
SE 5 mph
Precip.
100%
100%
Night
50°F
N 3 mph
Precip.
0%
0%
21.05
thu
thu
Day
63°F
SW 4 mph
Precip.
0%
0%
Night
54°F
NE 3 mph
Precip.
0%
0%
22.05
fri
fri
Day
64°F
S 3 mph
Precip.
0%
0%
Night
55°F
N 3 mph
Precip.
0%
0%
23.05
sat
sat
Day
68°F
NW 3 mph
Precip.
0%
0%
Night
59°F
NE 4 mph
Precip.
0%
0%
24.05
sun
sun
Day
70°F
S 3 mph
Precip.
0%
0%
Night
59°F
N 1 mph
Precip.
0%
0%
25.05
mon
mon
Day
68°F
SW 6 mph
Precip.
0%
0%
Night
54°F
NW 1 mph
Precip.
0%
0%
26.05
tue
tue
Day
64°F
NW 2 mph
Precip.
0%
0%
Night
54°F
NE 3 mph
Precip.
0%
0%
27.05
wed
wed
Day
64°F
S 3 mph
Precip.
0%
0%
Night
57°F
NE 2 mph
Precip.
100%
100%
28.05
thu
thu
Day
63°F
E 9 mph
Precip.
100%
100%
Night
54°F
E 4 mph
Precip.
100%
100%
29.05
fri
fri
Day
54°F
S 3 mph
Precip.
100%
100%
Night
54°F
NE 2 mph
Precip.
0%
0%
30.05
sat
sat
Day
59°F
S 3 mph
Precip.
100%
100%
Night
55°F
E 4 mph
Precip.
100%
100%
sea water
temperature
temperature
| St Gallen |
monthly
weather
weather
| St Gallen |
current
weather
weather
| St Gallen |
7 days
forecast
forecast
| St Gallen |
Sea water temperature in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 57.1°F. The highest and lowest sea temperatures during the month were 58.8°F and 55.8°F.
Sea water temperature in June, °F
Show year:
2025
2024
2023
The average sea water temperature in June of 2025 was 68.0°F. The highest and lowest sea temperatures during the month were 76.8°F and 61.7°F.
Air temperature in St Gallen, °F
Precipitation total in St Gallen, in.
* Charts above show average data for the last 3 years.
Best time for vacation in St Gallen
St Gallen on a weather map
Places in Switzerland:
Name
°F
24 Hours Forecast
St Gallen
Local time: 00:28
May 18, monday
0300
41°F
N
4 mph
4 mph
0600
41°F
N
3 mph
3 mph
0900
50°F
SE
3 mph
3 mph
1200
54°F
SE
10 mph
10 mph
1500
48°F
NE
6 mph
6 mph
1800
50°F
N
4 mph
4 mph
2100
46°F
N
4 mph
4 mph
May 19, tuesday
0000
43°F
N
5 mph
5 mph
