Saint John Weather & Harbour Tides — September 18, 2026

Saint John Weather Today

Saint John starts Friday with cloudy skies, light rain and fog patches. Environment Canada reported 15°C at 9:00 a.m. ADT at Saint John Airport, with light rain and a south-southwest wind of 15 km/h.

Periods of rain are expected to end this morning, followed by cloudy conditions and a 60 percent chance of showers. The forecast calls for clearing late this afternoon, with temperatures reaching a high of 19°C. Winds will shift to the northwest at about 20 km/h, gusting to 40 km/h.

Tonight will be partly clear with a low of 7°C. Northwest winds will remain strong, reaching 30 km/h with gusts up to 50 km/h.

Sunrise: 7:06 a.m.
Sunset: 7:30 p.m.

Saint John Harbour Tides

Predicted tides for the Saint John tide station (00065) on September 18:

Tide	Time	Height
High Tide	5:32 a.m.	6.739 m / 22.1 ft
Low Tide	11:41 a.m.	2.135 m / 7.0 ft
High Tide	5:54 p.m.	6.984 m / 22.9 ft

The Canadian Hydrographic Service notes that these are predicted tide times and heights and that official published tide tables take precedence where differences occur.

Saint John Today

For anyone heading outdoors, Friday will begin wet and foggy but should improve later in the day. The combination of afternoon clearing and gusty northwest winds will make conditions feel noticeably cooler along the waterfront and harbour.

Weather: Rain ending this morning, then showers and clearing later
High: 19°C
Low: 7°C
Winds: Northwest 20 km/h, gusting to 40 km/h; stronger tonight
Harbour: High tide 5:32 a.m. and 5:54 p.m.; low tide 11:41 a.m.

Official Sources

Environment and Climate Change Canada — Saint John Forecast:
Environment Canada Saint John Weather

Canadian Hydrographic Service — Saint John Tides:
Canadian Hydrographic Service Saint John Tides