Newfoundland Marine Forecast
Updated Tue Oct 13, 2026
NO-GO: heavy N seas, then S gale with rain Thursday
Marine Forecast for St. John's Approaches Oct 13–15, 2026
📋 NO-GO: heavy N seas, then S gale with rain Thursday
No-go. Strong north winds gusting over 30 knots early and steep 3.4-3.8 meter north seas at 9-10 seconds. Winds fade by evening but the swell stays big, and there is no window for a 12-hour trip.
No-go. Winds are light but a 2.2-3.4 meter north swell crosses a south-southwest wind-wave, making a confused cross-sea. No window for a 12-hour trip.
No-go. South winds of 22-23 knots gusting to 44 knots with heavy rain, plus steep 3.7 meter seas at 7 seconds and a confused cross-sea. Brief afternoon easing, then winds rebuild from the west by evening.
All three days are NO-GO and no day holds a settled stretch long enough for a 12-hour trip. Tuesday carries steep, heavy north seas with strong gusty northerly winds early; Wednesday has lighter winds but a big north swell; Thursday brings a strong southerly blow with heavy rain and steep seas. Model agreement is only moderate (57% Tuesday, 73% Wednesday, 69% Thursday), so timing of changes is uncertain.
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 Oct 13, 2026, the SeaLegs AI verdict for St. John's Approaches is NO-GO. No-go for Tuesday. Winds start at 16-17 knots from the north with gusts of 30-33 knots overnight, easing to 12-14 knots from the north-northwest and northwest through the morning and fading to a light 4-6 knots by evening. The real problem is the sea state: 3.2-3.8 meter north seas at 9-10 second periods give steep wind-wave chop for about 4 hours, and the swell stays big even when the wind drops. The evening lull from about 7:30 PM is calm in wind but still has 3.1-3.3 meter swell, and no settled stretch exists for a 12-hour trip. Heavy rain overnight (100% chance early) adds to the misery, and model agreement is low at 57%, especially on wind speed.
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.
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