Newfoundland Marine Forecast
Updated Thu Nov 5, 2026
Mixed outlook: Thursday is best, steeper chop Fri-Sat
Marine Forecast for St. John's Approaches Nov 5–7, 2026
📋 Mixed outlook: Thursday is best, steeper chop Fri-Sat
Light south-southwest winds of 2-9 knots and 1.0-1.3 meter north seas. A steep chop develops for about 3 hours in the evening as periods shorten to 6-7 seconds.
Steep southerly chop for about 11 hours, with 13 knot south-southwest winds, gusts to 28 knots and 5-second seas. Best stretch is 9:30 PM Thursday to 5:30 PM Friday.
Go only 12:30 AM to 5:30 PM; the rest of the day is not an option. Evening brings 1.6-1.7 meter north-northeast seas, with a cross-sea and steep chop to watch. 53% chance of showers around 8:30 AM.
Winds stay at or below 13 knots all three days, so the caution comes from sea state rather than wind. Thursday is the calmest day, Friday brings a steep southerly chop in the daytime, and Saturday is only workable until late afternoon before a northeast sea builds. It depends on the day: Thursday and the early part of Friday and Saturday are the good choices, and forecast confidence drops each day.
Recent days at St. John's Approaches
About the approaches to St. John's
This forecast covers the open Atlantic off St. John's — a point about 6 km off Cape Spear and 11 km east of the Narrows, outside the shelter of the harbour. Inside the Narrows the water is calm; out here it is the swell and the wind direction that decide the day.
It updates every morning from the latest marine model data, and each day gets an honest GO, CAUTION, or NO-GO call — the same AI rating used in the SeaLegs AI app.
Reading the water off St. John's
The east coast of the Avalon Peninsula faces the open North Atlantic with nothing to the east to break the sea, so the water off Cape Spear carries long-period swell that has nothing to do with the local wind. A quiet morning in the harbour says very little about what is running outside the Narrows.
The winds to respect are the northeasterlies and easterlies: they blow onshore with the whole ocean behind them. The cold Labrador Current runs down this coast, which brings two things other waters don't — thick fog when warmer air moves over the cold sea, most often in late spring and summer, and icebergs drifting south in spring and early summer. From late summer into autumn, the remains of tropical systems can reach Newfoundland with heavy swell and strong wind.
The water here stays cold all year, so a fall overboard is serious even on a GO day — dress for the water, not the air. This page is a planning aid, not a substitute for Environment and Climate Change Canada's marine forecasts and warnings — always check those before you leave.
St. John's Approaches forecast FAQ
How is the sea at St. John's Approaches today?
As of Nov 5, 2026, the SeaLegs AI verdict for St. John's Approaches is CAUTION. Mostly favorable day with a caution for a steep wind-wave chop for about 3 hours late in the day. Winds are light at 2-5 knots from the southwest through the morning, building to 7-9 knots from the south and south-southeast by midday and evening, with gusts reaching 17 knots. Seas run 1.0-1.3 meters from the north at comfortable 9-second periods early, shortening to 6-7 seconds by evening, which is where the steeper chop shows up as the swell turns northeast. Forecast confidence is fairly high at 81%, though wind speed varies between models. Best is the morning and early afternoon.
Does this forecast cover St. John's Harbour?
No — deliberately. The forecast point sits in open water about 11 km east of the Narrows, off Cape Spear, because that is the water that decides whether a trip is on. The harbour is almost fully enclosed, and a forecast placed inside it would tell you very little about what you'd meet once you cleared the Narrows.
Why can it be rough off Cape Spear on a calm day?
Because this coast faces the open North Atlantic, swell generated by distant storms arrives whether or not the local wind is blowing. A still morning in town and a large swell outside the Narrows is normal, which is why the wave period on this page matters as much as the wind.
What makes Newfoundland waters different?
The cold Labrador Current. It keeps the water cold all year, it produces dense fog when warmer air flows over it, and in spring and early summer it carries icebergs down the coast. Wind and swell are only part of the picture here — visibility and water temperature matter too.
How often is this forecast updated?
The page is rebuilt every morning from the latest model run, and the SpotCast card refreshes live in your browser. The date stamp above the outlook shows when it was last generated.
What do GO, CAUTION, and NO-GO mean?
GO means conditions are favourable for most boats. CAUTION means marginal — manageable for experienced crews in capable vessels, but check the wind and sea timing closely. NO-GO means conditions are hazardous for small craft and the trip is best postponed.
More offshore forecasts
Get this forecast for your own spot
Drop a pin on any spot on planet Earth in the free SeaLegs AI app — AI marine forecasts, fishing reports, and trip planning, rated GO / CAUTION / NO-GO.
📍 Get a Marine Forecast Near You →or download directly: