In September sea water temperature in some cities of Slovenia is above 20°C/68°F and it is enough for comfortable bathing. Based on water temperature observations over the past ten years, the warmest sea in Slovenia in September was 23°C/73°F, and the coldest 15°C/59°F
Slovenia cities and resorts with the values of the average water temperature in September in recent years. For more detailed information about water temperature, surf forecast, weather and time of sunrise and sunset in any specific area of your interest, just click on a ctiy name.
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Our report for Slovenia is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, water temperatures, surf forecasts, current temperatures and weather forecasts.