Surf Forecasts:
Number Fours surf forecast from 29 Aug 2026:
- Most powerful swell: Tuesday 1 Sep, 11PM (local time) - 7ft (2.1m), 8s period, ENE swell with 519 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 8s and forecast to arrive on Tuesday (Sep 01) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 7s period and expected on Monday (Aug 31) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Tue 1st Sep) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright, this is Rusty with a look at Number Fours.
Okay, look, we’ve got a long stretch ahead at Number Fours. The next few days are going to be pretty frustrating for surfers. From Saturday the 29th through Monday the 7th of September, it’s a grind. The wind is locked in from the ENE as a stubborn cross-off breeze, never giving us clean conditions. The swell is mostly short-period ENE windswell, and the wave energy is moderate, hovering around 500 to 880. Despite the water temp sitting at a warm 81°—which is pretty normal for this time of year—the surf quality is consistently poor. It’s just not worth paddling out for the first week. There’s a hint of something interesting on the 2nd of September with a long-period 16-second S swell, but the energy is still moderate (834) and the wind is still ruining it.
The real story starts on Tuesday, the 8th of September. The swell picks up to a solid 8ft from the ENE, the period stretches to 9–10 seconds, and the energy jumps into the strong range, hitting nearly 1500. The wind eases back a little, too. This is the standout window. By Wednesday the 9th, with a moderate breeze and clean conditions, this place will have some proper power. The swell direction is from the ENE, which is exactly what Number Fours wants, and the size is big enough for intermediates to have a ball, but with 8ft and strong energy (1819-1922), it’s getting towards expert territory. Expect some crowds as it's a fairly consistent spot that sometimes gets busy.
Thursday the 10th pushes the swell up to a hefty 10ft with energy surging past 2000. With that size and a short 8-second period, it's going to be a heavy, powerful wall that’s for experts only. The wind stays cross-off, but with that much juice, it’s going to be a beast.
After that, things drop off hard. The 11th and 12th of September bring onshore winds and messy conditions, with the swell fading. Sunday the 13th looks like a tiny, weak cleanup. The last call on the Sunday afternoon shows a 4ft E swell, barely 173 in energy, but the wind goes glassy. That’s a pretty sight for the end of a long run, but it’s not going to have any push.
The standout days are definitely Tuesday the 8th through Wednesday the 9th of September. That’s the window for a proper session if you can handle some size and a bit of crowd.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sat morning, min 25°C on Sat morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Tue night. Warm (max 27°C on Wed afternoon, min 24°C on Thu night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | |||||||||||||||
AM | PM | 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 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 16 | S 16 | S 15 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
195 | 189 | 419 | 325 | 263 | 256 | 359 | 310 | 428 | 421 | 441 | 423 | 422 | 322 | 305 | 288 | 288 | 276 | 276 | 258 | 295 | |
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 | cross-off | cross-off |
High Tide | 4:49PM0.57m | 5:30AM0.50m | 5:18PM0.51m | 6:18AM0.53m | 5:48PM0.44m | 7:14AM0.56m | 6:20PM0.36m | 8:21AM0.59m | 6:54PM0.28m | 9:39AM0.62m | 7:57PM0.22m | 10:58AM0.66m | 10:35PM0.19m | ||||||||
Low Tide | 10:31AM0.10m | 11:17PM0.05m | 11:22AM0.14m | 11:42PM0.05m | 12:22PM0.19m | 00:10AM0.05m | 1:40PM0.23m | 00:43AM0.05m | 3:38PM0.25m | 1:25AM0.06m | 6:22PM0.22m | 2:24AM0.08m | 7:30PM0.17m | 3:46AM0.09m | |||||||
6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | |
— | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | 1 | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 23 | 22 | 22 | 23 | 23 | 22 | 23 | 23 | 22 | 24 | 24 | 24 | 26 | 25 | 25 | 23 | 24 | 23 | 22 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | E 13 | E 12 | S 12 | SSW 16 | S 12 | SSW 15 | SSW 15 | SSW 14 | S 19 | S 18 | S 18 | S 17 | S 16 | S 16 | S 15 | S 14 | S 14 | S 13 | E 13 | E 13 | E 13 |
126 | 110 | 102 | 171 | 100 | 199 | 144 | 138 | 192 | 311 | 314 | 364 | 422 | 322 | 275 | 268 | 192 | 225 | 165 | 212 | 212 | |
Swell 2 Height (m) Direction Period (s) | S 13 | S 13 | E 12 | SSW 12 | SSW 16 | S 11 | S 11 | S 11 | S 10 | SSW 14 | S 12 | S 10 | SSE 10 | S 11 | E 14 | E 13 | E 13 | E 12 | S 13 | S 13 | S 13 |
85 | 89 | 106 | 46 | 162 | 59 | 82 | 79 | 50 | 80 | 75 | 35 | 19 | 65 | 136 | 167 | 157 | 141 | 170 | 165 | 119 | |
Swell 3 Height (m) Direction Period (s) | S 13 | S 12 | SSW 17 | SSE 12 | E 11 | ENE 10 | S 21 | SSW 19 | SW 14 | SSE 10 | SW 14 | SW 14 | SW 14 | E 12 | S 11 | SSE 10 | SSE 10 | SW 18 | SW 18 | E 9 | SSW 20 |
89 | 75 | 186 | 48 | 61 | 37 | 34 | 122 | 54 | 31 | 51 | 51 | 30 | 48 | 61 | 33 | 33 | 12 | 12 | 36 | 37 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 |
195 | 189 | 419 | 325 | 263 | 256 | 359 | 310 | 428 | 421 | 441 | 423 | 363 | 292 | 305 | 288 | 288 | 276 | 276 | 258 | 295 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 39 | 42 | 42 | 39 | 42 | 31 | 33 | 39 | 31 | 31 | 126 | 2 | 31 | 32 | 31 | 31 | 126 | 31 | 33 | 128 | 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.











