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:

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

Saint John Weather & Harbour Tides — Thursday, September 17, 2026

Saint John, New Brunswick — Today brings mainly cloudy conditions in Saint John, with temperatures reaching around 20–21°C. Fog patches are expected to dissipate this morning, with a chance of showers later today and rain expected to begin near midnight.

Today’s Saint John Weather

Thursday, September 17: Mainly cloudy with fog patches clearing this morning. High near 20°C, although temperatures may remain closer to 15°C along parts of the coast. UV index 5, or moderate.

Tonight: Cloudy with a 30 percent chance of showers this evening. Rain is expected to begin near midnight, with 5 to 10 mm possible. Fog patches may redevelop overnight. Low around 14°C.

Saint John Harbour Tides

Tide times below are for the Saint John tide station and are given in Atlantic Daylight Time (ADT).

The afternoon high tide reaches approximately 23.7 feet, while the late-evening low tide falls to about 5.7 feet.

Looking Ahead

Friday, September 18: Showers are expected to end near noon, followed by clearing. High around 19°C, with stronger northwest winds developing later in the day.

Saturday, September 19: Sunny and cooler, with a high near 17°C.

Sunday, September 20: Cloudy, with a high around 15°C.

Monday, September 21: A mix of sun and cloud, with temperatures rising to around 20°C.

Saint John Harbour Outlook

The combination of the high afternoon tide and changing autumn weather will make today interesting around the Saint John waterfront, Reversing Falls and harbour area. Anyone heading out on the water should check the latest marine and weather information before departure.

Sources

Weather: Environment and Climate Change Canada.

Tides: Fisheries and Oceans Canada — Saint John Tide Station 00065.

Weather and tide conditions can change. Check official forecasts before making boating, travel or other weather-sensitive plans.

BevNice.ca — Saint John local weather and harbour information.

Saint John, NB — Weather & Tides

Wednesday, September 16, 2026

A sun-and-cloud mix; breezy this afternoonm Saint John reaching about 14°C today, with clearing skies and southwest winds increasing to 20 km/h, gusting to 40 km/h around noon.

Bay of Fundy tides — Saint John Harbour

According to the Canadian Hydrographic Service:

The next high tide is therefore 4:12 PM today, with the next low at 10:30 PM.

Saint John, NB — Weather & Tides

Today, Tuesday, September 15: mostly sunny and pleasant, with temperatures around 20°C this afternoon.

Saint John Harbour tides — September 15

According to the Canadian Hydrographic Service:

The afternoon high tide at 3:28 PM is the day’s higher high tide. Tide times are Atlantic Daylight Time (ADT).

Canadian Hydrographic Service — Saint John tide predictions