Warm
Average highs sit around 28°C, giving warm days by monthly-average standards.
Weather Guide
Portorož, Slovenia Average Monthly Weather
Weather score43Mixed annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 18°C, sunshine averages 5.9h per day, and rainfall totals about 1022mm. Sea temperatures average 17°C across the year.
Annual weather
Annual averages
Temp
18°C
Rain
1022mm
Annual total
Sun
5.9h
Sea
17°C
Weather score
43
Mixed avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 93mm, so some wet days are possible.
Bright
Sunshine averages 8.7h per day, so bright days are a strong part of the month.
Swimmable
Sea temperatures average 26°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
August28°C average high
August is one of Portorož's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August93mm average rain
August sits near Portorož's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to August, October, and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August8.7 hours average sun
August is brighter than Portorož's yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsJune to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August26°C average sea
August is one of Portorož's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJune to September
Sea temperatures are usually near 23°C in this stretch, so swimming comfort is at its strongest.
Weather score
August76 weather score
August is one of Portorož's best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
