Mild
Average highs are around 21°C, so days are mild rather than hot.
Weather Guide
Saint John, New Brunswick, Canada Average Monthly Weather
Weather score27Poor annual avg
Best months: August, July, June
Across the year, average daytime temperatures are around 10°C, sunshine averages 5.1h per day, and rainfall totals about 1315mm. Sea temperatures average 8°C across the year.
Annual weather
Annual averages
Temp
10°C
Rain
1315mm
Annual total
Sun
5.1h
Sea
8°C
Weather score
27
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 97mm, so some wet days are possible.
Some sun
Sunshine averages 6.9h per day, enough for a balanced month.
Cool sea
Sea temperatures average 14°C, so the water can feel cool.
Map
Weather map
Compare Saint John, New Brunswick, Canada with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August21°C average high
August is one of Saint John's warmest months, with daytime heat above the yearly average.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August97mm average rain
August is one of Saint John's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsFebruary to October
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August6.9 hours average sun
August is one of Saint John's sunniest months, with some of the strongest bright-day conditions in the yearly averages.
Brightest monthsMay to August
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August14°C average sea
August is one of Saint John's warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to October
Sea temperatures are usually near 13°C in this stretch, so swimming comfort is at its strongest.
Weather score
August46 weather score
August is one of Saint John'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.
