Mild
Average highs are around 24°C, so days are mild rather than hot.
September verdict
Portorož, Slovenia in September
Weather score60Good
Good for holiday weather
Average highs are around 24°C, so days are mild rather than hot. Sunshine averages 7h per day, enough for a balanced month. Rainfall averages 102mm, so some wet days are possible.
September weather
Monthly averages
Temp
24°C
Rain
102mm
Sun
7h
Sea
23°C
Weather score
60
Good
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 102mm, so some wet days are possible.
Some sun
Sunshine averages 7h per day, enough for a balanced month.
Swimmable
Sea temperatures average 23°C, which can work for swimming but may feel fresh.
Map
Weather map
Compare Portorož, Slovenia with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September24°C average high
September sits in the warmer part of the year, so midday sightseeing can feel heavier than in cooler months.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
September102mm average rain
September is wetter than Portorož's yearly average, so flexible plans matter more.
Driest monthsJanuary to August, October, and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September7 hours average sun
September sits close to Portorož's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September23°C average sea
September sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJune to September
Sea temperatures are usually near 23°C in this stretch, so swimming comfort is at its strongest.
Weather score
September60 weather score
September sits close to Portorož's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
