Surf Forecasts:
Number Fours surf forecast from 25 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 Wednesday (Aug 26) 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, Rusty here. Let’s have a look at what Number Fours is cooking up for us. It’s a reef setup that works best with a solid SSE direction, but for the next couple of weeks we’re mostly dealing with a long stretch of cross-off ENE winds and some pretty average conditions.
Right out of the gate, Tuesday the 25th through into the first week is a bit of a struggle. The wind is hangin’ in strong from the ENE, creating cross-off conditions and keeping things clean but the swell is coming from the wrong direction – ENE – with a short, weak period around 7 seconds. The swell hangs around the 5 feet mark, but with that period, it’s just not doing the reef any favours. You’re lookin’ at a combined energy in the moderate range (568–673). Wednesday the 26th afternoon into Thursday the 27th morning is the only blip where we get a whisper of S swell (4 ft at 17 seconds), but it’s still marginal thanks to the wind. Most days are scoring a 0 or 1 – honestly, it’s a tough stretch with not much to get excited about.
We hit a bit of a lull Friday the 28th and Saturday the 29th before things get a little bigger. By Monday the 1st of September, the ENE swell bumps up to 7 ft with a combined energy that jumps into the strong range (1006), but the period is still short (8 seconds) and the wind is cross-off fresh breeze. This is getting into expert territory size-wise for a short-period wave, so it’s gonna be a handful and not super user-friendly.
The real standout, though, is the morning of Wednesday the 9th of September. We finally see a shift: the wind drops to a gentle cross-off from the NNE, and we get a pulse of long-period S swell (2 ft at a very long 19 seconds) and the combined energy is moderate (490). It’s a small day, but that long period groundswell is pure quality – it will wrap into the reef perfectly with clean conditions, glassy potential. For a spot like Number Fours that likes a good S groundswell, this is the pick of the bunch. It’s late in the forecast, so it’s promising but you’ll want to keep an eye on it.
So, overall, there’s a big gap of mediocrity from now through to early September, then a few days of bigger, messier ENE swell, and then that one clean, small, long-period S swell morning. If you’re only paddling out once, make it that morning of the 9th.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 26°C on Mon night, min 25°C on Mon night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Fri morning, min 25°C on Thu night). Mainly fresh winds. | ||||||||||||||||||
Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | ||||||||||||||
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 7 | ENE 7 | E 7 | SSW 14 | S 18 | S 19 | S 17 | S 16 | S 16 | S 14 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||
214 | 308 | 261 | 236 | 225 | 307 | 351 | 716 | 427 | 482 | 260 | 329 | 225 | 240 | 247 | 230 | 210 | 282 | 298 | |
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 | 2:21AM0.29m | 2:56PM0.68m | 2:55AM0.33m | 3:24PM0.68m | 3:31AM0.37m | 3:53PM0.66m | 4:08AM0.41m | 4:20PM0.62m | 4:47AM0.46m | 4:49PM0.57m | 5:30AM0.50m | 5:18PM0.51m | |||||||
Low Tide | 9:35PM0.13m | 7:43AM0.06m | 9:53PM0.11m | 8:24AM0.05m | 10:12PM0.10m | 9:05AM0.06m | 10:32PM0.08m | 9:46AM0.07m | 10:54PM0.07m | 10:31AM0.10m | 11:17PM0.05m | 11:22AM0.14m | 11:42PM0.05m | ||||||
— | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | |
6:53 | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 26 | 24 | 23 | 24 | 22 | 23 | 22 | 24 | 23 | 23 | 23 | 23 | 22 | 23 | 22 | 22 | 24 | 24 | 22 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 12 | SSW 16 | SSW 15 | SSW 14 | S 18 | S 19 | S 17 | S 16 | S 16 | S 14 | S 14 | S 13 | E 13 | E 13 | E 12 | SSW 16 | SSW 16 | SSW 15 |
127 | 85 | 142 | 121 | 215 | 307 | 351 | 716 | 427 | 482 | 260 | 329 | 225 | 126 | 168 | 108 | 171 | 162 | 199 | |
Swell 2 Height (m) Direction Period (s) | SSE 7 | SSW 16 | SSW 12 | SSW 12 | S 18 | SSW 13 | SSW 13 | NNE 8 | SSW 12 | NNE 7 | E 16 | E 14 | E 13 | S 13 | S 13 | SSW 17 | E 12 | S 12 | S 11 |
20 | 146 | 81 | 81 | 165 | 135 | 137 | 7 | 47 | 10 | 78 | 103 | 128 | 85 | 89 | 186 | 101 | 71 | 84 | |
Swell 3 Height (m) Direction Period (s) | SSE 12 | SSE 12 | SSE 6 | SSW 18 | SSE 12 | SSE 6 | SSW 16 | WNW 10 | W 9 | E 17 | SSW 11 | SSW 19 | SW 19 | S 13 | S 12 | SSW 12 | S 12 | SSW 11 | S 20 |
46 | 29 | 8 | 109 | 27 | 7 | 50 | 9 | 7 | 24 | 22 | 36 | 56 | 89 | 75 | 47 | 69 | 25 | 30 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
214 | 308 | 261 | 236 | 225 | 165 | 165 | 139 | 146 | 160 | 167 | 189 | 214 | 240 | 247 | 230 | 210 | 282 | 298 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 31 | 39 | 39 | 31 | 39 | 44 | 2 | 31 | 34 | 31 | 33 | 44 | 31 | 39 | 46 | 31 | 31 | 39 | 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.











