Cool
Average highs are around 15°C, so pack for cooler days.
September verdict
Karlsöarna, Sweden in September
Weather score31Poor
Poor for holiday weather
Average highs are around 15°C, so pack for cooler days. Sunshine averages 4.6h per day, so this is not one of the brighter months. Rainfall averages 52mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
15°C
Rain
52mm
Sun
4.6h
Sea
15°C
Weather score
31
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 52mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 4.6h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 15°C, so the water can feel cool.
Map
Weather map
Compare Karlsöarna, Sweden with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September15°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
September52mm average rain
September is close to Karlsöarna's usual rainfall pattern, with little seasonal change across the year.
Driest monthsAll year
Rainfall stays comparatively low through the year.
Sun
September4.6 hours average sun
September sits close to Karlsöarna'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
September15°C average sea
September sits in the warmer sea-temperature season, usually making swimming easier to enjoy.
Warmest seaJuly to September
Sea temperatures are usually near 17°C in this stretch, so swimming comfort is at its strongest.
Weather score
September31 weather score
September sits close to Karlsöarna's yearly weather-score average, giving a typical overall read on the month.
Best weather monthsJune to August
These months have the strongest weather score in the monthly averages.
Hotels near Karlsöarna, Sweden
Marriott
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