Skip to content
Surfhog home
Menu

Historical surf replay

St Ives Bay surf conditions on Tue, Aug 18, 2026

Godrevy wave and weather forecasts and weather observations, with Sevenstones offshore and Perranporth inshore wave readings. Each source keeps its own location and role so the view provides coastal context without presenting nearby buoy readings as measurements at the surf break.

Surf Day Summary

AI-generated summary. Hog Says

There were waves, but they were messy rather than clean: the WSW swell was angled and carried minimal shore-normal energy, while moderate short-period wind sea met the beach onshore. Perranporth’s aligned WNW observations confirmed active, rising seas, but their 6.4-second peak period suggests small to moderate, weakly breaking surf at Godrevy.

Generated from the completed forecast and observations shown on this page.

Day at a glance

Forecast and observations in their coastal context

Predicted at Godrevy

Last stored wave forecast

Primary swell height
0.1–0.6 ft
Primary swell period
8.1–18.4s
Primary swell direction
WSW 242°
angled into this coast
Combined sea height
3.3–4.2 ft
Combined sea period
3.6–4.1s
Combined sea direction
WNW 290°

Wind mostly westerly

W 278°onshore

24 stored hourly values. This is the final stored revision, not necessarily the forecast first issued for the day.

Observed in west Cornwall

Godrevy wind and weather

Wind speed
5–16 mph

Wind mostly westerly

W 270°onshore

24 observations. Godrevy is close enough to provide useful regional wind context for both coasts, although local effects can differ. Explore all weather readings.

Incoming Atlantic swell

Sevenstones

Significant wave height
2–3.6 ft
Average period
5.3–6.1s
Reported wave direction
Unavailable
Exposure unavailable

24 readings. rising height trend; medium confidence from metoffice. Open the Sevenstones archive.

Nearby north-coast inshore response

Perranporth

Significant wave height
2.6–5.6 ft
Peak period
5.1–7.1s
Peak wave direction
WNW 282°
well aligned with this coast

48 readings. rising height trend; high confidence from cco. Open the Perranporth archive.

How the stored wind forecast compared

Observed average wind was 4 mph lighter than the last stored forecast.

Forecast: wind mostly westerly; observed: wind mostly westerly.

Observed wind at W 270° was onshore for Godrevy and Gwithian.

These sources describe different locations and exposures. Offshore and inshore buoy readings provide context for St Ives Bay; they are not measurements taken at the surf break itself. Directional labels use Godrevy and Gwithian as a representative north-west-facing swell window; individual peaks and beaches can differ.

Hour-by-hour replay

The charts share the same time axis so offshore signals, inshore readings and regional wind can be compared without treating them as the same measurement location.

Two line charts show wave height and wind speed through the selected day for St Ives Bay. The detailed table following the charts contains the same values in text form.

Swell and sea height through the day

Wind speed through the day

Metrics are rows; hours run left to right. Times use your device time zone.
Hourly forecast and observation values
Metric
Godrevy Primary swell height (ft)0.30.10.10.10.10.10.10.10.10.10.10.10.10.10.20.20.20.20.20.20.20.20.20.6
Primary swell period (s)8.28.28.18.18.18.48.79.09.09.19.19.19.29.212.315.418.418.117.817.517.417.417.416.5
Primary swell directionWSW 252°WSW 237°WSW 237°WSW 238°WSW 239°WSW 239°WSW 239°WSW 239°WSW 239°WSW 240°WSW 240°WSW 239°WSW 239°WSW 238°WSW 241°WSW 243°WSW 246°WSW 245°WSW 245°WSW 244°WSW 244°WSW 244°WSW 244°WSW 247°
Godrevy Combined sea height (ft)3.43.63.63.73.84.04.24.24.14.04.14.14.14.14.04.03.93.83.73.63.43.33.33.3
Combined sea period (s)3.63.73.73.73.83.83.93.94.04.04.04.14.14.14.14.04.04.04.04.03.93.93.93.9
Combined sea directionWNW 290°WNW 287°WNW 286°WNW 286°WNW 285°WNW 286°WNW 288°WNW 290°WNW 291°WNW 292°WNW 294°WNW 294°WNW 294°WNW 294°WNW 293°WNW 292°WNW 291°WNW 290°WNW 290°WNW 290°WNW 291°WNW 291°WNW 292°WNW 292°
Godrevy forecast weather (3-hourly)
Godrevy forecast wind (mph)15W16W16W16W16W16W16W16W17W17WNW17WNW17WNW16WNW15WNW15WNW14WNW13WNW13WNW12W12W12W12W13W13W
Observed weather
Observed wind (mph)12W11WSW11WSW11WSW10W16W13W14W16W13W11WNW13WNW11NW11WNW9WNW8W13W13W11W10W8W9WSW8W5SW
Sevenstones Significant wave height (ft)2.32.02.32.32.62.63.03.03.33.33.03.33.63.63.63.63.03.03.03.33.33.33.02.6
Sevenstones Observed wave period (s)5.35.65.45.85.95.75.75.65.95.95.95.75.75.85.96.16.05.95.75.85.96.06.05.9
Sevenstones Observed wave directionUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailableUnavailable
Perranporth Significant wave height (ft)2.72.93.23.53.94.85.05.64.84.44.64.64.74.64.54.34.34.44.84.93.84.23.43.4
Perranporth Observed wave period (s)5.15.75.96.16.16.56.56.56.16.56.26.77.16.57.16.76.76.76.76.96.56.76.55.7
Perranporth Observed wave directionW 277°W 267°W 277°WNW 285°W 277°W 276°NW 316°WNW 294°W 259°W 271°WNW 298°WNW 285°W 281°W 277°W 281°W 274°WNW 284°WNW 294°WNW 284°W 271°WNW 284°WNW 298°WNW 292°W 280°

Swipe sideways to see more hours.