The highest day temperature in January 2025 was 57°F. The lowest night temperature was 26°F. The average values for day and night temperatures during January were 47.7°F и 36.5°F respectivly.

The average sea surface temperature in January 2025 for Portoroz was 51.8°F. The maximum and minimum values were 50.4°F and 53.6°F respectively.

You can expect various weather conditions during January. Be ready for sunny, cloudy or even gloomy days.

Precipitation total in January for Portoroz is 2.6 in. It makes january one of the least rainy months of the year.

The average wind speed in January is 5.5 mph. This value is relatively stable throughout the year.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Portoroz in January is 4.8 hours.