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Live forecasts update automatically; written guidance last reviewed 16 June 2026 by the Civic Maple Weather Desk. Data from Environment and Climate Change Canada and other national met services via Open-Meteo.
Saint John’s weather today is shaped by the Bay of Fundy – expect cool sea breezes and quick cloud shifts. The live forecast above shows current conditions; temperatures here stay a few degrees cooler than inland New Brunswick most of the year.
What makes Saint John’s weather different?
Saint John sits on the Bay of Fundy, so coastal fog and wind are common. Summer highs usually reach 20–25°C, while winter lows hover around -10°C to -15°C. The bay keeps spring and fall milder than inland areas, but it also brings more rain and drizzle.
When is the best time to visit for fair weather?
July through September give the most settled days – warm, less fog, and least rain. October can still be pleasant, but fog returns often from late autumn into early summer. Winter storms are possible from December to March, but the city’s harbour usually stays ice-free.
Does Saint John get more fog than other Canadian cities?
Yes. Saint John averages about 100 foggy days per year – among the highest in Canada. The cold Fundy waters meet warm air, creating dense fog that can linger for hours, especially in spring and early summer.
How does the Bay of Fundy affect winter temperatures?
The bay moderates winter cold, keeping Saint John slightly warmer than Fredericton or Moncton. Overnight lows rarely drop below -20°C, though wind chill can feel much colder when strong northeast winds blow.
Is Saint John windier than other Atlantic Canadian cities?
Yes, but not as windy as St. John’s, NL. Average wind speed is around 15–20 km/h year-round, with gusts over 50 km/h during fall and winter storms. The exposed coastline near the harbour is breeziest.
For a broader look at Canadian conditions, see the national weather hub or compare with 10-day outlooks for other regions.