St John weather in September 2025

Q: How hot is it in St John in September?

Daytime temperatures usually reach 18°C in St John in September, falling to 10°C at night.

Q: How sunny is it in St John in September?

There are normally 6 hours of bright sunshine each day in St John in September - that's 46% of daylight hours.

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

The average sea temperature around St John in September is 13°C.

Q: Does it rain in St John in September?

There are usually 11 days with some rain in St John in September and the average monthly rainfall is 104mm.

Q: What is the chance of a cyclone in St John in September?

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

Expect 64°F daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in St John in September. Check more long-term weather averages for St John in September before you book your next holiday to New Brunswick in 2025/2026.

64
64°F max day temperature
6
6 hours of sunshine per day
11
11 days with some rainfall
50
50°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
4.1
4.1 inches of monthly rainfall
5
5 (Moderate) UV index
55
55°F sea temperature

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The September weather guide for New Brunswick (St John) 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)

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How hot is it in St John in September?

Daytime temperatures usually reach 64°F in St John in September, falling to 50°F at night.

How sunny is it in St John in September?

There are normally 6 hours of bright sunshine each day in St John in September - that's 46% of daylight hours.

How warm is the sea around St John in September?

The average sea temperature around St John in September is 55°F.

Does it rain in St John in September?

There are usually 11 days with some rain in St John in September and the average monthly rainfall is 4.1 inches.

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

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

St John September sunrise & sunset times

Browse the sunrise and sunset times for St John in September 2025. Select a month to view St John 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	05:46	19:01
Monday, 15th September 2025	06:03	18:35
Tuesday, 30th September 2025	06:22	18:06

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New Brunswick - quick facts
Flight time^✝	12 hours
Time difference	UK -4 hours
Language(s)	English, French
Currency	Canadian Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes
Why visit?	Nature
Tourist info	Tourism New Brunswick