Newfoundland & Labrador weather in September 2025

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

  • 16°C maximum daytime temperature in September in Newfoundland & Labrador (St John's)16
    16°C max day temperature
  • 5 hours of sunshine per day
  • 15 days with some rainfall in September in Newfoundland & Labrador (St John's)15
    15 days with some rainfall
  • 8°C minimum night-time temperature in September in Newfoundland & Labrador (St John's)8
    8°C min night temperature
  • 13 hours of daylight per day in September in Newfoundland & Labrador (St John's)13
    13 hours of daylight per day
  • No heat & humidity in September in Newfoundland & Labrador (St John's)0
    No heat & humidity
  • 117 mm monthly rainfall in September in Newfoundland & Labrador (St John's)117
    117 mm of monthly rainfall
  • UV (maximum) index 5 (Moderate) in September in Newfoundland & Labrador (St John's)5
    5 (Moderate) UV index
  • 12°C sea temperature in September in Newfoundland & Labrador (St John's)12
    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.

Top Newfoundland & Labrador destinations

Below are average maximum temperatures at popular countries, regions and places in Newfoundland & Labrador in September. Select a holiday destination to see more weather parameters.

All Newfoundland & Labrador destinations

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

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How warm is it in Newfoundland & Labrador in September?

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

How sunny is it in Newfoundland & Labrador in September?

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

How warm is the sea around Newfoundland & Labrador in September?

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

Does it rain in Newfoundland & Labrador in September?

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

What is the chance of a hurricane in Newfoundland & Labrador in September?

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

Newfoundland & Labrador September sunrise & sunset times

Browse the sunrise and sunset times for Newfoundland & Labrador in September 2025. Select a month to view Newfoundland & Labrador sunrise and sunset times for the next 12 months. The Newfoundland & Labrador sunrise and sunset times shown below are for St John's.

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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