Surf Forecasts:
Number Fours surf forecast from 12 Sep 2026:
- Best quality surf: Sunday 13 Sep, 5PM (local time) - 1.5ft (0.4m), 15s period, SSW swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 2AM (local time) - 8ft (2.4m), 9s period, ENE swell with 880 kJ wave energy.
- Next surfable swell (1★+): Sunday 13 Sep, 5PM (local time) - 1.5ft (0.4m), 15s period with SSW 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 (Sep 13) at 5PM. The primary swell is predicted to be 0.4m and 15s period with a secondary swell of 0.6m and 9s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Number Fours in the next 16 days are 2.4m 9s and forecast to arrive on Friday (Sep 18) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Wednesday (Sep 16) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sun 13th Sep) | 1.5ft (0.4m) 15s |
| Best Surf | 5PM (Sun 13th Sep) | 1.5ft (0.4m) 15s |
| Most Powerful | 2AM (Fri 18th Sep) | 8ft (2.4m) 9s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what Number Fours has in store.
The opening days are a bust for any real surf. Saturday the 12th kicks off with a meager 0.7m of long-period SW groundswell, but the energy is weak (370) and it’s barely rideable. Sunday and Monday are even smaller, with heights under 0.5m. You’re looking at a long dry spell before anything worthwhile shows up.
Things start to rumble around Thursday the 17th. We get a jump to 2.2m, but it’s short-period ENE windswell (8 seconds) with a stiff 35 km/h cross-off wind. The energy is strong (958), but the conditions are rough—better suited for a kite than a paddle. Friday the 18th is similar, with 2.4m and even more energy (1275), but that fresh breeze and short period keep it ugly for most.
The real highlight, the session to aim for, lands on Thursday the 24th and Friday the 25th. Thursday afternoon turns on with a clean 1.4m of E swell at 10 seconds, moderate energy (696), and the wind drops to a glassy 5 km/h cross-off. That’s about as pristine as it gets here. The water temperature is running average for this time of year. Friday holds that quality with 1.4m of ENE swell at 11 seconds, light 15 km/h winds, and clean conditions. Crowds are "sometimes", so expect a few others in the water, but the wave quality will be well worth it.
After that, Saturday the 26th and Sunday the 27th fade back into smaller SSW groundswell, around 0.7m to 0.8m, but with light winds and clean faces, they’re still a decent option for a relaxed session.
Bottom line: mark Thursday the 24th afternoon and Friday the 25th as your best bet for the cleanest, most enjoyable surf in this stretch.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sat morning, min 24°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Tue afternoon, min 25°C on Mon night). Winds increasing (light winds from the NE on Mon night, fresh winds from the ENE by Wed afternoon). | ||||||||||||||||||
Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | ||||||||||||||
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 10 | SW 15 | SW 16 | ENE 9 | SW 15 | SSW 15 | SW 12 | SW 23 | SW 22 | SW 21 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SSW 17 | ENE 8 | ENE 8 | ENE 9 |
Wave Graph  | |||||||||||||||||||
 kJ | 245 | 242 | 124 | 84 | 107 | 84 | 38 | 86 | 227 | 224 | 392 | 384 | 470 | 455 | 541 | 377 | 540 | 691 | 880 |
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 | cross-off |
High Tide | 4:51AM0.54m | 4:42PM0.50m | 5:31AM0.57m | 5:11PM0.43m | 6:14AM0.58m | 5:40PM0.36m | 7:02AM0.58m | 6:07PM0.30m | 7:59AM0.57m | 6:32PM0.25m | 9:10AM0.56m | 7:25PM0.21m | |||||||
Low Tide | 10:33PM0.04m | 10:52AM0.13m | 10:56PM0.05m | 11:45AM0.17m | 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 | ||||||
 |  | |  |  | | | | | | | | | | | | | | | |
 | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | 6:37 | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 26 |
Feels °C | 24 | 25 | 25 | 25 | 26 | 25 | 25 | 25 | 24 | 24 | 26 | 28 | 26 | 25 | 25 | 25 | 25 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | ENE 10 | ENE 10 | NE 9 | NNE 9 | NNE 9 | NE 9 | NE 9 | NE 8 | NE 8 | NNE 8 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SSW 17 | SW 16 | SW 16 | SSW 18 |
| kJ | 245 | 128 | 81 | 99 | 99 | 112 | 79 | 58 | 54 | 44 | 392 | 384 | 470 | 455 | 541 | 377 | 258 | 258 | 644 |
Swell 2 Height (m) Direction Period (s) | SW 15 | SW 15 | ENE 10 | ENE 9 | SW 15 | SSW 15 | SW 12 | SW 14 | SW 22 | SW 21 | NNE 8 | NNE 8 | E 11 | SW 12 | SW 11 | SSW 11 | SSW 20 | SSW 19 | W 10 |
| kJ | 226 | 242 | 98 | 84 | 107 | 84 | 38 | 49 | 227 | 224 | 50 | 34 | 58 | 35 | 31 | 12 | 149 | 210 | 7 |
Swell 3 Height (m) Direction Period (s) | SSW 11 | NE 8 | SW 16 | SSW 13 | ENE 9 | SW 12 | ENE 8 | SW 23 | SW 14 | SSW 13 | E 12 | E 12 | NNE 7 | WSW 8 | SSE 12 | SSE 11 | SSE 11 | SW 10 | SE 10 |
| kJ | 24 | 74 | 124 | 68 | 26 | 23 | 14 | 86 | 49 | 68 | 46 | 68 | 21 | 6 | 13 | 12 | 11 | 4 | 4 |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 5 | E 5 | ENE 9 | ENE 4 | ENE 5 | ENE 5 | ENE 5 | E 5 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 9 |
| kJ | — | — | — | 14 | 17 | 59 | 8 | 34 | 28 | 25 | 18 | 47 | 113 | 280 | 350 | 366 | 540 | 691 | 880 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 1 | 31 | 1 | 31 | 1 | 0 | 7 | 31 | 1 | 1 | 31 | 1 | 31 | 39 | 42 | 31 | 39 | 126 | 31 |
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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