Surf Forecasts:
Number Fours surf forecast from 27 Aug 2026:
- Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.1m), 17s period, S swell with 716 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 1.1m 17s and forecast to arrive on Thursday (Aug 27) at 11AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Friday (Aug 28) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Thu 27th Aug) | 3.5ft (1.1m) 17s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's get into it.
We've got a pretty lean run of surf ahead for Number Fours. The next few days are looking tough with small, wind-affected swells and a lot of marginal conditions. The water is sitting at a warm 81° which is about average for this time of year, so at least you won't be freezing while you're sitting there waiting for a wave.
The first real chance of anything decent doesn't pop up until way down the track. From now through the first week of September, it's mostly a write-off. We're seeing small swells from the S and then ENE, mostly around 3 ft to 6 ft, but the period is short, between 6 and 8 seconds, which means weak, crumbly waves. The wind is a persistent cross-off from the ENE, blowing at 15 to 25 mph, which will keep the surface clean but the wave quality is just not there. The combined wave energy is weak to moderate, with readings like 929, 617, and 475, which tells the story.
Around the 6th of September, things start to pick up a little. On Sunday the 6th, we see a pulse of swell from the ENE at 5 ft with a period of 11 seconds, giving a combined energy of 680. It's still marginal, but the longer period is a step in the right direction. The wind is a moderate 15 mph cross-off, so it'll be clean, but the waves will be inconsistent. This pattern continues into the next week, with the swell building a bit more.
The standout, and I mean the only real standout in this entire forecast, is the morning of Tuesday the 8th of September. The swell from the ENE hits 7 ft with a 10-second period, and the combined energy jumps to 1315 – that's moderate to strong energy. But the key here is the wind. It's light from the east at only 6 mph, which is a light cross-off breeze. That will give us some of the cleanest conditions we've seen all forecast. The description says "excellent surf conditions for experienced surfers", and that's no joke. At 7 ft, it's getting a bit solid for beginners, but for the experienced crew, this is the window. It's a long period groundswell, which is best on a reef setup like Number Fours, so the shape should be there. Keep in mind the ENE direction might not be the absolute optimum (the spot likes SSE), but with the size and clean conditions, it's the best bet.
After that, the swell holds in the 6 ft to 8 ft range with decent periods, but the wind gets a bit tricky again, turning cross and cross-on at times. By the 11th of September, we see a 10 ft swell from the ENE, but the period drops to 9 seconds and the wind is cross-on from the SE, which will chop things up. That's big enough for experts only, but the quality will be compromised. The combined energy hits 2209, which is strong, but the messy wind will make it a challenge.
So, to sum it up: you've got a long wait. The first week is a bust. The best surf on offer is the morning of Tuesday the 8th of September at Number Fours. It'll be a solid 7 ft from the ENE, clean with light winds, and the reef should handle the long period well. It's a promising window, but it's over a week away, so keep an eye on it. Everything else is marginal at best.
Stay patient, and I'll catch you in the water.
Rusty
Short Range ForecastMostly dry. Warm (max 26°C on Thu morning, min 25°C on Thu morning). Mainly strong winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Mon night. Warm (max 27°C on Tue morning, min 25°C on Sun morning). Mainly fresh winds. | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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) | S 17 | S 16 | S 16 | S 14 | S 14 | S 13 | ENE 6 | 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 8 | ENE 8 |
Wave Graph | |||||||||||||||||||||
716 | 427 | 482 | 260 | 329 | 229 | 177 | 276 | 326 | 235 | 229 | 257 | 315 | 423 | 423 | 466 | 423 | 343 | 423 | 373 | 341 | |
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 | 3:53PM0.66m | 4:08AM0.41m | 4:20PM0.62m | 4:47AM0.46m | 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 | ||||||||
Low Tide | 9:05AM0.06m | 10:32PM0.08m | 9:46AM0.07m | 10:54PM0.07m | 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 | |||||||
6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | |
— | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | 2 |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 23 | 23 | 22 | 23 | 23 | 22 | 23 | 23 | 22 | 23 | 22 | 24 | 23 | 24 | 24 | 26 | 25 | 26 | 26 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | S 17 | S 16 | S 16 | S 14 | S 14 | S 13 | E 13 | E 12 | S 12 | SSW 16 | S 12 | SSW 15 | SSW 15 | SSW 14 | S 10 | S 18 | S 18 | S 17 | S 16 | S 16 | S 15 |
716 | 427 | 482 | 260 | 329 | 229 | 126 | 110 | 102 | 171 | 100 | 199 | 144 | 136 | 51 | 311 | 311 | 277 | 334 | 318 | 275 | |
Swell 2 Height (m) Direction Period (s) | N 8 | SSW 12 | NNE 7 | E 16 | E 15 | E 14 | S 13 | S 13 | E 12 | E 11 | SSW 16 | S 11 | S 11 | S 11 | S 19 | SSW 14 | S 12 | S 11 | E 16 | E 15 | E 14 |
6 | 46 | 10 | 78 | 109 | 146 | 85 | 89 | 106 | 65 | 162 | 59 | 57 | 55 | 192 | 116 | 75 | 60 | 121 | 150 | 194 | |
Swell 3 Height (m) Direction Period (s) | NW 9 | NNE 8 | E 17 | SSW 11 | SSW 19 | SW 19 | S 13 | S 12 | SSW 17 | SSW 12 | E 11 | ENE 10 | S 21 | SSW 19 | SW 14 | SSE 9 | SW 14 | E 17 | SSE 10 | SSE 9 | S 11 |
3 | 7 | 24 | 22 | 36 | 56 | 89 | 75 | 186 | 46 | 61 | 37 | 34 | 122 | 53 | 8 | 51 | 53 | 35 | 29 | 36 | |
Wind waves Height (m) Direction Period (s) | E 6 | ENE 6 | E 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | 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 8 | ENE 8 |
213 | 144 | 206 | 115 | 128 | 172 | 177 | 276 | 326 | 235 | 229 | 257 | 315 | 423 | 423 | 466 | 423 | 343 | 423 | 373 | 341 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 34 | 32 | 31 | 31 | 126 | 31 | 39 | 42 | 39 | 33 | 42 | 31 | 31 | 39 | 1 | 31 | 39 | 4 | 31 | 31 | 31 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.











