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).
| Time | Tide | Height |
|---|---|---|
| 4:41 AM | High Tide | 7.003 m / 23.0 ft |
| 10:50 AM | Low Tide | 1.875 m / 6.2 ft |
| 5:01 PM | High Tide | 7.218 m / 23.7 ft |
| 11:20 PM | Low Tide | 1.739 m / 5.7 ft |
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.