Mild
Average highs are around 21°C, so days are mild rather than hot.
September verdict
Slovenia in September
Weather score47Mixed
Mixed for holiday weather
Average highs are around 21°C, so days are mild rather than hot. Sunshine averages 6.3h per day, enough for a balanced month. Rainfall averages 130mm, so some wet days are possible.
September weather
Monthly averages
Temp
21°C
Rain
130mm
Sun
6.3h
Sea
9°C
Weather score
47
Mixed
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 130mm, so some wet days are possible.
Some sun
Sunshine averages 6.3h per day, enough for a balanced month.
Cool sea
Sea temperatures average 9°C, so the water can feel cool.
Map
Weather map
Compare Slovenia with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September21°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
September130mm average rain
September is wetter than Slovenia's yearly average, so flexible plans matter more.
Driest monthsJanuary to March and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September6.3 hours average sun
September sits close to Slovenia's yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
September9°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 9°C in this stretch, so swimming comfort is at its strongest.
Weather score
September47 weather score
September sits close to Slovenia'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.
