Cool
Average highs are around 15°C, so pack for cooler days.
May verdict
Thunder Bay, Ontario, Canada in May
Weather score34Poor
Poor for holiday weather
Average highs are around 15°C, so pack for cooler days. Sunshine averages 8.3h per day, so bright days are a strong part of the month. Rainfall averages 70mm, which is relatively low for holiday planning.
May weather
Monthly averages
Temp
15°C
Rain
70mm
Sun
8.3h
Sea
3°C
Weather score
34
Poor
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Drier
Rainfall averages 70mm, which is relatively low for holiday planning.
Bright
Sunshine averages 8.3h per day, so bright days are a strong part of the month.
Cool sea
Sea temperatures average 3°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
May15°C average high
May 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
May70mm average rain
May is wetter than Thunder Bay's yearly average, so flexible plans matter more.
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
May8.3 hours average sun
May is brighter than Thunder Bay'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
May3°C average sea
May is below Thunder Bay's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaAugust to September
Sea temperatures are usually near 16°C in this stretch, so swimming comfort is at its strongest.
Weather score
May34 weather score
May scores below Thunder Bay'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.
