St John's weather in September 2025

Expect 16°C daytime maximum temperatures in the shade with on average 5 hours of sunshine per day in St John's in September. Check more long-term weather averages for St John's in September before you book your next holiday to Newfoundland & Labrador in 2025/2026.

  • 16°C maximum daytime temperature in September in St John's16
    16°C max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in St John's15
    15 days with some rainfall
  • 8°C minimum night-time temperature in September in St John's8
    8°C min night temperature
  • 13 hours of daylight per day in September in St John's13
    13 hours of daylight per day
  • No heat & humidity in September in St John's0
    No heat & humidity
  • 117 mm monthly rainfall in September in St John's117
    117 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in St John's5
    5 (Moderate) UV index
  • 12°C sea temperature in September in St John's12
    12°C sea temperature

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The September weather guide for Newfoundland & Labrador (St John's) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

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

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More about Canada

How warm is it in St John's in September?

Daytime temperatures usually reach 16°C in St John's in September, falling to 8°C at night.

How sunny is it in St John's in September?

There are normally 5 hours of bright sunshine each day in St John's in September - that's 38% of daylight hours.

How warm is the sea around St John's in September?

The average sea temperature around St John's in September is 12°C.

Does it rain in St John's in September?

There are usually 15 days with some rain in St John's in September and the average monthly rainfall is 117mm.

What is the chance of a hurricane in St John's in September?

On average less than 1 day in September in St John's is likely to be affected by the passage of one or more tropical storms.

St John's September sunrise & sunset times

Browse the sunrise and sunset times for St John's in September 2025. Select a month to view St John's sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:20 18:41
Monday, 15th September 2025 05:39 18:12
Tuesday, 30th September 2025 05:59 17:42

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