Cool
Average highs are around 17°C, so pack for cooler days.
September verdict
Ertholmene, Denmark in September
Weather score33Poor
Poor for holiday weather
Average highs are around 17°C, so pack for cooler days. Sunshine averages 4.8h per day, so this is not one of the brighter months. Rainfall averages 61mm, which is relatively low for holiday planning.
September weather
Monthly averages
Temp
17°C
Rain
61mm
Sun
4.8h
Sea
16°C
Weather score
33
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 61mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 4.8h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 16°C, so the water can feel cool.
Map
Weather map
Compare Ertholmene, Denmark with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September17°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
September61mm average rain
September is wetter than Ertholmene's yearly average, so flexible plans matter more.
Driest monthsJanuary to October and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September4.8 hours average sun
September sits close to Ertholmene'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
September16°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
September33 weather score
September sits close to Ertholmene'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.
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