Cool
Average highs are around 15°C, so pack for cooler days.
September verdict
Marathon (Ontario), Canada in September
Weather score23Poor
Poor for holiday weather
Average highs are around 15°C, so pack for cooler days. Sunshine averages 4.7h per day, so this is not one of the brighter months. Rainfall averages 95mm, so some wet days are possible.
September weather
Monthly averages
Temp
15°C
Rain
95mm
Sun
4.7h
Sea
14°C
Weather score
23
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 95mm, so some wet days are possible.
Limited sun
Sunshine averages 4.7h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 14°C, so the water can feel cool.
Map
Weather map
Compare Marathon (Ontario), Canada 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 monthsMay to September
This stretch sets the upper range for average daytime heat.
Rain
September95mm average rain
September is one of Marathon (Ontario)'s wettest months, so rain is likely to be a major planning factor.
Driest monthsJanuary to May and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
September4.7 hours average sun
September sits close to Marathon (Ontario)'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
September14°C average sea
September is one of Marathon (Ontario)'s warmest sea months, when swimming comfort is usually strongest.
Warmest seaAugust to September
Sea temperatures are usually near 14°C in this stretch, so swimming comfort is at its strongest.
Weather score
September23 weather score
September scores below Marathon (Ontario)'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.
