Surf Forecasts:
Number Fours surf forecast from 10 Aug 2026:
- Best quality surf: Sunday 16 Aug, 11PM (local time) - 21ft (6.5m), 14s period, ENE swell with cross-shore winds.
- Most powerful swell: Monday 17 Aug, 2AM (local time) - 25ft (7.5m), 13s period, ENE swell with 17,935 kJ wave energy.
- Next surfable swell (1★+): Sunday 16 Aug, 2AM (local time) - 10ft (3.0m), 12s period with ENE swell.
Best Forecast Surf Conditions for Number Fours this week:
The surf forecast for Number Fours over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 16) at 2AM. The primary swell is predicted to be 3.0m and 12s period with a secondary swell of 0.7m and 13s. Another secondary swell of 0.3m and 18s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Number Fours in the next 16 days are 7.5m 13s and forecast to arrive on Monday (Aug 17) at 2AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Aug 12) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Sun 16th Aug) | 10ft (3.0m) 12s |
| Best Surf | 11PM (Sun 16th Aug) | 21ft (6.5m) 14s |
| Most Powerful | 2AM (Mon 17th Aug) | 25ft (7.5m) 13s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Yo, grab your wettie and listen up. This is Rusty, with a look at what Number Fours is gonna do over the next couple of weeks.
Overall, it’s a bit of a waiting game here. The surf has been poor for a while now, with nothing in the water to get excited about early on. That’s looking like it’ll stick, with no worthwhile surf from today right through until the 15th of August. You’ll be looking at a solid gap of around six days with nothing on offer. When there is a little bump of energy mid-week, it comes with messy, cross-off winds from the ENE at 18-22 mph, so it's not going to shape up well at all.
Now, hold onto your board, because there’s a proper pulse of swell showing for the 16th of August. This is the real standout. The waves jump up to 12-13 ft from the ENE, and the wind swings around to a light offshore from the NNW, only 12 mph. That is clean. The combined wave energy is pumping hard, so there's a ton of grunt in the water. This is a big, powerful swell with short periods (11-13 seconds), and it’s only recommended for experienced surfers. Beginners, this one ain’t for you. The water temp is about average for this time of year. Crowds are always a possibility here, especially when it's this good, so expect some company. The swell direction is coming from the ENE, which is a touch off the optimum SSE for this reef, but with those conditions, it should still handle it.
The quality drops off sharply after that. The 17th sees the wind switch onshore from the south, ruining the surf and making it a complete mess. The rest of the final week through to the 25th is an up-and-down story. There are swells in the water from the SSW and SW, but the cross-off wind from the ENE remains a persistent problem, knocking the quality back to marginal or poor. The wave heights hover between 2 ft and 5 ft with long periods of 15-23 seconds, but the constant wind keeps it from cleaning up. It’s just not worth paddling out for if you're looking for anything decent.
So bottom line: wait for that 16th of August window, get in there early, and be ready for a clean, powerful session. The rest of the window is a write-off. Keep your wax warm 'til then.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Mon morning, min 25°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Thu morning, min 25°C on Wed night). Mainly fresh winds. | ||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | ||||||||||||||
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) | ENE 7 | ENE 8 | ENE 7 | ENE 7 | SSW 14 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 11 | ENE 12 |
Wave Graph  | |||||||||||||||||||
 kJ | 252 | 196 | 199 | 214 | 165 | 269 | 276 | 509 | 498 | 520 | 501 | 662 | 537 | 456 | 462 | 691 | 936 | 1815 | 3045 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | off |
High Tide | 2:02AM0.22m | 2:54PM0.80m | 2:55AM0.26m | 3:35PM0.79m | 3:43AM0.31m | 4:13PM0.75m | 4:30AM0.36m | 4:48PM0.69m | 5:17AM0.40m | 5:22PM0.62m | 6:06AM0.44m | 5:54PM0.53m | |||||||
Low Tide | 9:40PM0.08m | 7:20AM-0.02m | 10:10PM0.06m | 8:15AM-0.02m | 10:40PM0.05m | 9:08AM-0.00m | 11:08PM0.04m | 9:58AM0.03m | 11:36PM0.04m | 10:49AM0.08m | 00:03AM0.04m | 11:43AM0.14m | 00:30AM0.05m | ||||||
 |  | |  | | | | | | | | | | | | | |  | | |
 | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — |
 | 7:05 | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 27 | 26 | 26 | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 25 | 26 | 26 | 26 | 27 | 27 | 25 |
Feels °C | 26 | 26 | 25 | 25 | 25 | 25 | 24 | 24 | 24 | 23 | 24 | 24 | 23 | 23 | 22 | 23 | 25 | 26 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 |
| kJ | 223 | 184 | 176 | 186 | 165 | 269 | 243 | 509 | 498 | 520 | 501 | 662 | 537 | 411 | 411 | 302 | 225 | 168 | 173 |
Swell 2 Height (m) Direction Period (s) | SSW 12 | SSW 12 | SSE 10 | SSW 11 | SSW 11 | SE 9 | S 20 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | W 12 | W 11 | W 12 | W 12 | W 11 | W 11 | W 13 | S 18 |
| kJ | 56 | 56 | 35 | 23 | 41 | 20 | 276 | 218 | 218 | 222 | 150 | 11 | 10 | 11 | 11 | 21 | 21 | 29 | 56 |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SSE 10 | SSW 11 | SSE 9 | SSE 9 | S 21 | SSE 9 | W 13 | W 12 | W 12 | W 12 | SW 19 | SW 18 | SW 18 | SSW 18 | SSW 17 | SW 17 | S 16 | W 13 |
| kJ | 18 | 19 | 42 | 16 | 16 | 79 | 15 | 30 | 25 | 25 | 11 | 14 | 13 | 12 | 30 | 28 | 12 | 43 | 29 |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 6 | ENE 6 | E 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 11 | ENE 12 |
| kJ | 252 | 196 | 199 | 214 | 156 | 163 | 181 | 176 | 144 | 213 | 232 | 278 | 382 | 456 | 462 | 691 | 936 | 1815 | 3045 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 31 | 31 | 31 | 1 | 31 | 2 | 2 | 31 | 32 | 31 | 31 | 126 | 31 | 126 | 32 | 31 | 31 | 165 | 0 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
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Information about the Number Fours Surf forecast
The above surf forecast table for Number Fours provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Number Fours can be found by selecting the local surf guide option on the grey menu. Our Number Fours 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 (Number Fours) 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 Number Fours 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.
Number Fours is 5 km (3 miles) from Honolulu. If you plan a vacation in Oahu, look for hotels and other accommodation in Honolulu. Honolulu has rooms for a wide range of budgets as well as car hire and transport links.
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