
Surf Forecasts:
Number Fours surf forecast from 14 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 2PM (local time) - 7ft (2.1m), 10s period, ENE swell with 811 kJ wave energy.
Best Forecast Surf Conditions for Number Fours this week:
The most powerful waves expected at Number Fours in the next 16 days are 2.1m 10s and forecast to arrive on Thursday (Sep 17) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 16) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Thu 17th Sep) | 7ft (2.1m) 10s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Hey everyone, Rusty here, checking in on Number Fours for the next couple of weeks.
Alright, let's be straight – the next while is a tough one. We've got a real long stretch of surf that just can't get its act together. The wind is mostly cross-off, which keeps it clean, but the wave quality just isn't there to make a session worthwhile.
We kick off on Monday the 14th with tiny, weak 1ft swell from the SW. The energy is pretty weak, and with a period over 20 seconds, it's a long-period groundswell, but there’s just no power behind it. Tuesday and Wednesday are more of the same, with swell getting up to about 3ft, but the scores are still pointing to marginal surf. It’s clean, but it’s not doing anything for anyone.
Then Thursday the 17th gets interesting, but not in a good way. The swell jumps to over 7ft, but it's a short-period 8-second windswell from the ENE. The energy gets up there, but that short period means it’s going to be a bouncy, unpredictable mess at this reef. An experienced surfer might find a wave, but the quality is gone.
Friday the 18th has a clean 3ft SSW groundswell with a long 17-second period and strong energy, but the wind goes cross-shore and puts a nasty chop on the surface. The next few days are all that same story: 6-7ft of short-period windswell with a fresh breeze. It's just not happening.
The one real highlight, and the only time I'd bother to paddle out, is Thursday the 17th afternoon. It’s a short-period swell, sure, but at over 6ft, coming from the ENE and with strong energy, it’s got some real grunt. The cross-off wind keeps the surface clean. It’s the best score in the whole run, and for a short window, Number Fours will have some serious, clean power. Don't miss that afternoon.
After that, it’s a long, frustrating stretch right through to the end of the period. Swell stays in the 5-7ft range, but it's almost all that short-period windswell. The wind is relentless, blowing 20-25 mph, keeping everything messy. By the last few days of September, the energy drops right off, and it’s back to a non-event.
Honestly, this is a rough outlook. A long run of ‘almost but not quite’. That Thursday 17th afternoon is your only real shot. If you can’t make it, you’re better off waiting. Forecasts can turn, but this one's a grind.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Mon afternoon, min 25°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryModerate rain (total 14mm), heaviest on Thu night. Warm (max 27°C on Thu afternoon, min 26°C on Wed night). Mainly fresh winds. | ||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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) | SW 12 | SW 23 | SW 22 | SW 21 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | ENE 8 | ENE 9 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | ENE 8 | ENE 8 | E 8 |
Wave Graph | |||||||||||||||||||
38 | 86 | 227 | 224 | 392 | 384 | 470 | 455 | 541 | 429 | 525 | 637 | 644 | 622 | 580 | 539 | 473 | 449 | 581 | |
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 | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:14AM0.58m | 5:40PM0.36m | 7:02AM0.58m | 6:07PM0.30m | 7:59AM0.57m | 6:32PM0.25m | 9:10AM0.56m | 7:25PM0.21m | 10:27AM0.57m | 11:01PM0.21m | 11:34AM0.59m | 00:19AM0.23m | |||||||
Low Tide | 11:19PM0.06m | 12:45PM0.20m | 11:42PM0.08m | 2:03PM0.23m | 00:07AM0.11m | 4:06PM0.24m | 00:38AM0.13m | 7:14PM0.21m | 1:26AM0.16m | 7:23PM0.18m | 2:56AM0.18m | 7:43PM0.16m | 4:35AM0.17m | ||||||
— | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
6:36 | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 3 | 9 | — | — | 2 | — | — | — |
Temp °C | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 26 |
Feels °C | 26 | 25 | 26 | 27 | 28 | 27 | 26 | 27 | 26 | 26 | 25 | 27 | 26 | 25 | 25 | 26 | 26 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | NE 9 | NE 8 | NE 8 | NE 8 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | SW 16 | SW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 16 |
79 | 58 | 54 | 31 | 392 | 384 | 470 | 455 | 541 | 429 | 258 | 258 | 644 | 622 | 580 | 539 | 382 | 387 | 273 | |
Swell 2 Height (m) Direction Period (s) | SW 12 | SW 14 | SW 22 | SW 21 | NNE 8 | E 12 | NNE 8 | SW 12 | SW 11 | SSW 11 | SSW 20 | SSW 19 | SSE 10 | SSE 9 | SSE 6 | SSE 7 | SSW 18 | SSE 6 | SW 16 |
38 | 49 | 227 | 224 | 24 | 68 | 22 | 35 | 43 | 12 | 149 | 210 | 9 | 8 | 15 | 15 | 108 | 15 | 122 | |
Swell 3 Height (m) Direction Period (s) | ENE 8 | SW 23 | SW 14 | SSW 13 | E 12 | SW 12 | E 11 | S 9 | S 8 | SSE 11 | SW 11 | SSE 10 | WSW 10 | W 9 | W 9 | S 20 | SSE 6 | S 18 | SSW 14 |
14 | 86 | 49 | 68 | 46 | 38 | 58 | 6 | 5 | 12 | 18 | 10 | 9 | 2 | 7 | 67 | 12 | 99 | 37 | |
Wind waves Height (m) Direction Period (s) | ENE 4 | ENE 5 | ENE 4 | ENE 5 | ENE 5 | NE 8 | ENE 5 | ENE 10 | ENE 6 | ENE 7 | ENE 8 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | E 8 | ENE 8 | ENE 8 | E 8 |
8 | 28 | 26 | 37 | 37 | 99 | 66 | 331 | 181 | 374 | 525 | 637 | 608 | 472 | 383 | 496 | 473 | 449 | 581 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 2 | 1 | 1 | 1 | 1 | 31 | 4 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 32 | 2 | 42 | 33 | 31 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.










