St John's weather in September 2025

Q: 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.

Q: 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.

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

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

Q: 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.

Q: What is the chance of a cyclone 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.

Expect 61°F 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.

61
61°F max day temperature
5
5 hours of sunshine per day
15
15 days with some rainfall
46
46°F min night temperature
13
13 hours of daylight per day
0
No heat & humidity
4.6
4.6 inches of monthly rainfall
5
5 (Moderate) UV index
54
54°F 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) | Imperial (°F)

More about Canada

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

Daytime temperatures usually reach 61°F in St John's in September, falling to 46°F 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 54°F.

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 4.6 inches.

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.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

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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Newfoundland and Labrador - quick facts
Flight time^✝	9.5 hours
Time difference	UK -3.5 to -4 hours
Language(s)	English, French
Currency	Canadian Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Nature
Tourist info	Newfoundland & Labrador Tourism