Cool
Average highs are around 10°C, so pack for cooler days.
Weather Guide
Thunder Bay, Ontario, Canada Average Monthly Weather
Weather score33Poor annual avg
Best months: July, August, June
Across the year, average daytime temperatures are around 8°C, sunshine averages 5.8h per day, and rainfall totals about 715mm. Sea temperatures average 6°C across the year.
Annual weather
Annual averages
Temp
8°C
Rain
715mm
Annual total
Sun
5.8h
Sea
6°C
Weather score
33
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 60mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 3.9h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 10°C, so the water can feel cool.
Map
Weather map
Compare Thunder Bay, Ontario, Canada with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
October10°C average high
October is close to Thunder Bay's yearly temperature average, giving a typical read on daytime heat.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
October60mm average rain
October sits near Thunder Bay's yearly rainfall average, so rain is a normal planning factor rather than an outlier.
Driest monthsJanuary to April and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
October3.9 hours average sun
October is below Thunder Bay's yearly sunshine average, so bright-day planning is less reliable than in peak months.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
October10°C average sea
October is close to Thunder Bay's yearly sea-temperature average, so swimming comfort is fairly typical.
Warmest seaAugust to September
Sea temperatures are usually near 16°C in this stretch, so swimming comfort is at its strongest.
Weather score
October25 weather score
October is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
