Cool
Average highs are around 20°C, so pack for cooler days.
September verdict
Apostle Islands National Lakeshore, United States in September
Weather score34Poor
Poor for holiday weather
Average highs are around 20°C, so pack for cooler days. Sunshine averages 6.1h per day, enough for a balanced month. Rainfall averages 95mm, so some wet days are possible.
September weather
Monthly averages
Temp
20°C
Rain
95mm
Sun
6.1h
Sea
15°C
Weather score
34
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 95mm, so some wet days are possible.
Some sun
Sunshine averages 6.1h per day, enough for a balanced month.
Cool sea
Sea temperatures average 15°C, so the water can feel cool.
Map
Weather map
Compare Apostle Islands National Lakeshore, United States with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
September20°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
September95mm average rain
September is one of Apostle Islands National Lakeshore's wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to March and December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September6.1 hours average sun
September sits close to Apostle Islands National Lakeshore'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 seaAugust to September
Sea temperatures are usually near 18°C in this stretch, so swimming comfort is at its strongest.
Weather score
September34 weather score
September scores below Apostle Islands National Lakeshore's yearly average, so the weather trade-offs are more noticeable.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
Hotels near Apostle Islands National Lakeshore, United States
Marriott
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