Surf Forecasts:
Goat Island/Mokuauia surf forecast from 20 Aug 2026:
- Best quality surf: Thursday 20 Aug, 11AM (local time) - 3ft (0.9m), 7s period, NE swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 2PM (local time) - 6.5ft (2.0m), 7s period, E swell with 422 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 11AM (local time) - 3ft (0.9m), 7s period with NE swell.
Best Forecast Surf Conditions for Goat Island/Mokuauia this week:
The surf forecast for Goat Island/Mokuauia over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 11AM. The primary swell is predicted to be 0.9m and 7s period with a secondary swell of 0.7m and 8s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Goat Island/Mokuauia in the next 16 days are 2.0m 7s and forecast to arrive on Tuesday (Aug 25) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 12s period and expected on Saturday (Aug 22) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11AM (Thu 20th Aug) | 3ft (0.9m) 7s |
| Best Surf | 11AM (Thu 20th Aug) | 3ft (0.9m) 7s |
| Most Powerful | 2PM (Tue 25th Aug) | 6.5ft (2.0m) 7s |
Table - best surf conditions forecast for Goat Island/Mokuauia over the next 16 days.
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 24°C on Wed night). Winds increasing (light winds from the E on Thu night, fresh winds from the ENE by Sat afternoon). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Mon morning. Warm (max 26°C on Sun morning, min 25°C on Sat night). Mainly fresh winds. | ||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | E 8 | NE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | E 6 | E 7 | E 7 | E 7 | E 7 | ENE 6 | E 7 | E 7 | E 7 | E 7 | E 8 | E 8 |
Wave Graph  | |||||||||||||||||||
 kJ | 104 | 77 | 160 | 91 | 51 | 86 | 114 | 167 | 229 | 306 | 345 | 320 | 226 | 255 | 312 | 331 | 385 | 408 | 300 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-on | cross | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross | cross | cross |
High Tide | 11:16AM0.58m | 12:00PM0.62m | 12:32PM0.66m | 9:55PM0.30m | 12:59PM0.69m | 11:14PM0.34m | 1:23PM0.72m | 11:55PM0.38m | 1:45PM0.73m | 00:32AM0.41m | |||||||||
Low Tide | 00:38AM0.09m | 2:04AM0.09m | 3:39AM0.08m | 8:41PM0.23m | 7:47PM0.22m | 5:26AM0.02m | 7:44PM0.21m | 6:02AM-0.00m | 7:55PM0.20m | ||||||||||
 |  | | | |  | | | | | | | |  | |  | |  | | |
 | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — |
 | 6:59 | — | 6:58 | — | — | 6:57 | — | — | 6:55 | — | — | 6:55 | — | — | 6:54 | — | — | 6:53 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | 1 | — | — | — | — |
Temp °C | 25 | 26 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 |
Feels °C | 25 | 29 | 30 | 29 | 30 | 29 | 28 | 27 | 25 | 24 | 25 | 25 | 23 | 25 | 25 | 25 | 25 | 25 | 26 |
Swell 1 Height (m) Direction Period (s) | E 8 | NE 7 | ENE 7 | ENE 7 | ENE 7 | NNE 7 | SW 16 | SSW 16 | W 12 | WNW 12 | WNW 11 | WNW 11 | ESE 9 | WNW 11 | NW 11 | NW 10 | NW 9 | NW 10 | NW 11 |
| kJ | 104 | 77 | 160 | 91 | 51 | 41 | 124 | 98 | 69 | 167 | 107 | 105 | 90 | 87 | 58 | 25 | 23 | 26 | 29 |
Swell 2 Height (m) Direction Period (s) | NE 6 | E 8 | W 11 | NNE 7 | NNE 7 | SW 16 | W 10 | WNW 10 | SSW 16 | SW 15 | SW 15 | SW 15 | WNW 11 | SW 14 | SW 13 | SSW 13 | SSW 16 | SSW 12 | SSW 15 |
| kJ | 58 | 58 | 36 | 51 | 41 | 64 | 31 | 33 | 95 | 60 | 57 | 54 | 81 | 50 | 28 | 32 | 25 | 14 | 21 |
Swell 3 Height (m) Direction Period (s) | SW 16 | SW 18 | SW 17 | SSW 16 | W 11 | W 10 | ESE 8 | WNW 13 | WNW 14 | WSW 9 | WSW 9 | WSW 9 | SW 14 | SW 18 | S 13 | W 12 | W 12 | SSW 16 | SSW 12 |
| kJ | 67 | 79 | 76 | 104 | 36 | 31 | 14 | 33 | 41 | 8 | 8 | 8 | 51 | 12 | 3 | 3 | 11 | 25 | 13 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | E 7 | ENE 7 | E 6 | E 7 | E 7 | E 7 | E 7 | ENE 6 | E 7 | E 7 | E 7 | E 7 | E 8 | E 8 |
| kJ | — | — | — | — | — | 86 | 114 | 167 | 229 | 306 | 345 | 320 | 226 | 255 | 312 | 331 | 385 | 408 | 300 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 11 | 0 | 0 | 11 | 8 | 11 | 15 | 15 | 36 | 37 | 37 | 154 | 37 | 36 | 36 | 36 | 36 | 36 | 36 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Goat Island/Mokuauia surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Goat Island/Mokuauia Surf forecast
The above surf forecast table for Goat Island/Mokuauia provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Goat Island/Mokuauia can be found by selecting the local surf guide option on the grey menu. Our Goat Island/Mokuauia surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Goat Island/Mokuauia) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Goat Island/Mokuauia may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Goat Island/Mokuauia is 21 km (13 miles) from Wahiawa. If you plan a vacation in Oahu, look for hotels and other accommodation in Wahiawa. Wahiawa has rooms for a wide range of budgets as well as car hire and transport links.
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