St John weather in September

Check the Weather in St John, New Brunswick in September before you book your next holiday. This gives the best indication of the weather in September and includes figures for temperature, sunshine and rainfall.

  • 18°C maximum daytime temperature in September in St John18
    18°C max day temperature
  • 6 hours of sunshine per day (46% of daylight hours) in September in St John6
    6 hours of sunshine per day
  • 11 days with some rainfall in September in St John11
    11 days with some rainfall
  • 10°C minimum night-time temperature in September in St John10
    10°C min night temperature
  • 12 hours of daylight per day in September in St John12
    12 hours of daylight per day
  • No heat & humidity in September in St John0
    No heat & humidity
  • 104 mm monthly rainfall in September in St John104
    104 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in St John5
    5 (Moderate) UV index
  • 14°C sea temperature in September in St John14
    14°C sea temperature

Metric (°C / mm)  |  Imperial (°F / inches)

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