Cool
Average highs are around 19°C, so pack for cooler days.
Weather Guide
Marathon (Ontario), Canada Average Monthly Weather
Weather score28Poor annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 6°C, sunshine averages 5.1h per day, and rainfall totals about 863mm. Sea temperatures average 6°C across the year.
Annual weather
Annual averages
Temp
6°C
Rain
863mm
Annual total
Sun
5.1h
Sea
6°C
Weather score
28
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 84mm, so some wet days are possible.
Some sun
Sunshine averages 7.4h per day, enough for a balanced month.
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
August19°C average high
August is one of Marathon (Ontario)'s hottest months, so shade and slower afternoons matter.
Warmest monthsMay to September
This stretch sets the upper range for average daytime heat.
Rain
August84mm average rain
August is wetter than Marathon (Ontario)'s yearly average, so flexible plans matter more.
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
August7.4 hours average sun
August is brighter than Marathon (Ontario)'s yearly average, though the strongest sunshine usually sits closer to the peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August14°C average sea
August 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
August41 weather score
August is one of Marathon (Ontario)'s best weather-score months, combining the strongest overall balance in the yearly averages.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
