Weather in Portoroz: May
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Average day temperature: | 69.9°F |
| Average night temperature: | 53.8°F | |
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Sea water temperature: | 64.3°F |
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Number of sunny days: | 14 days |
| Day length: | 14.3 - 15.4 hours | |
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Number of rainy days: | 7 days |
| Precipitation totals: | 3.6 in. | |
| more information | ||
14 days
forecast
forecast
| Portoroz |
sea water
temperature
temperature
| Portoroz |
Air temperature in May, °F
Show year:
2026
2025
2024
The highest day temperature during May of 2026 was 86°F. At the same time the lowest night temperature was 41°F. Daily and nightly averages during May were 70.6°F and 53.7°F.
Sea water temperature in Portoroz in May, °F
Show year:
2026
2025
2024
The average sea water temperature in May of 2026 was 65.5°F. The highest and lowest sea temperatures during the month were 74.3°F and 59.2°F.
Sunny, partly cloudy and cloudy days
Number of sunny, partly cloudy and cloudy days in May is almost equal.
Precipitation total in May, in.
Precipitation total value in Portoroz in May is 4.1 in. Other months of the year show relatively similar values.
Wind speed in May, mph
The average wind speed value in May is 5.4 mph
Average sunny hours
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in May is: 7.9.
Best time for vacation in Portoroz
Portoroz on a weather map
Places in Slovenia:
Name
°F
24 Hours Forecast
Portoroz
Local time: 09:25
November 01, sunday
1200
54°F
SW
16 mph
16 mph
1500
52°F
SW
13 mph
13 mph
1800
50°F
SW
14 mph
14 mph
2100
46°F
SW
13 mph
13 mph
November 02, monday
0000
48°F
SW
16 mph
16 mph
0300
48°F
SW
16 mph
16 mph
0600
48°F
SW
16 mph
16 mph
0900
50°F
SW
16 mph
16 mph
