Surf Forecasts:
Number Fours surf forecast from 28 Aug 2026:
- Most powerful swell: Thursday 3 Sep, 2PM (local time) - 6ft (1.8m), 12s period, E swell with 909 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 1.8m 12s and forecast to arrive on Thursday (Sep 03) 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 1.5m 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 | 2PM (Thu 3rd Sep) | 6ft (1.8m) 12s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down Number Fours.
We’re looking at a quiet start. Plenty of clean water, but the wind is mostly a cross-off from the ENE, and the swell is weak and short-period. The water temp sits around 81°F, pretty normal for the time.
Thursday the 27th has a 16-second S groundswell at about 3ft, but that 22 mph cross-off wind kills it. Combined energy is moderate (662). Then we hit a dry spell from Friday the 28th through to Tuesday the 3rd of September – the swell gets bigger, but it’s all short-period windswell from the ENE, bumpy and not worth paddling out for.
Wednesday the 2nd of September gives us a little hope with S groundswell again, but it’s still only marginal. The change comes Thursday afternoon the 3rd of September, when a 6ft E groundswell at 12 seconds shows up, with a lighter 16 mph cross-off. Energy jumps to 1125 and things start to look fun.
The best run is Friday the 4th through Sunday the 6th of September. Friday morning: 6ft E swell, 12 seconds, clean. Saturday the 5th: 7ft E swell at 11 seconds – solid. Sunday the 6th brings the biggest energy of the whole period at 2121, with a 7ft ENE swell at 10 seconds. That’s powerful, head-high-plus surf, but the shorter period means it’ll be a bit lumpy.
Monday the 7th of September is the standout. The afternoon delivers a perfect 4ft SSW groundswell at 15 seconds, with a gentle 9 mph cross-off breeze and glassy conditions. Energy is 975. This is the session – clean, long-period, and the reef will make it gorgeous.
After that, it tapers off, but Thursday the 10th of September afternoon goes glassy with a 3ft E groundswell at 11 seconds and no wind. Small but perfect.
Best call? Monday the 7th of September afternoon. For power, Sunday the 6th.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Thu afternoon, min 25°C on Thu night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Tue afternoon, min 25°C on Sun night). Mainly fresh winds. | |||||||||||||||||||
Thu 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | ||||||||||||||
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 16 | S 16 | S 14 | S 14 | S 13 | 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 | ENE 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 427 | 482 | 260 | 329 | 225 | 233 | 423 | 326 | 325 | 263 | 268 | 366 | 455 | 463 | 488 | 455 | 372 | 422 | 322 | 480 |
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 |
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 | 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 | — | — | 6:15 | — | — |
 | 6:52 | — | — | 6:51 | — | — | 6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 26 | 27 | 26 |
Feels °C | 23 | 22 | 23 | 24 | 22 | 23 | 22 | 22 | 23 | 22 | 23 | 23 | 24 | 23 | 26 | 25 | 26 | 25 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | S 16 | S 16 | S 14 | S 14 | S 13 | E 13 | S 13 | S 12 | SSW 16 | S 12 | SSW 15 | SSW 15 | SSW 14 | S 19 | SSW 18 | S 18 | S 17 | S 16 | S 16 | E 13 |
| kJ | 427 | 482 | 260 | 329 | 225 | 126 | 89 | 102 | 171 | 100 | 199 | 144 | 138 | 192 | 329 | 314 | 280 | 422 | 322 | 212 |
Swell 2 Height (m) Direction Period (s) | SSW 12 | NNE 7 | E 16 | E 15 | E 14 | S 13 | S 12 | E 12 | E 11 | SSW 16 | S 11 | S 11 | S 11 | S 10 | SSW 14 | S 12 | S 13 | E 14 | E 12 | S 15 |
| kJ | 47 | 10 | 78 | 109 | 146 | 85 | 75 | 106 | 65 | 162 | 82 | 81 | 57 | 33 | 77 | 77 | 52 | 142 | 141 | 279 |
Swell 3 Height (m) Direction Period (s) | NNE 8 | E 17 | SSW 11 | SSW 19 | SW 19 | S 13 | SSW 17 | SSW 17 | SSW 12 | E 11 | ENE 10 | S 21 | SSW 19 | SSW 14 | W 12 | SW 14 | SW 14 | SW 14 | E 14 | SSE 11 |
| kJ | 6 | 24 | 22 | 36 | 56 | 89 | 115 | 186 | 46 | 61 | 37 | 34 | 122 | 79 | 12 | 51 | 52 | 30 | 65 | 37 |
Wind waves Height (m) Direction Period (s) | 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 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
| kJ | 188 | 213 | 165 | 132 | 167 | 233 | 423 | 326 | 325 | 263 | 268 | 366 | 455 | 463 | 488 | 455 | 372 | 307 | 292 | 480 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 44 | 39 | 31 | 126 | 31 | 39 | 42 | 48 | 39 | 42 | 31 | 39 | 126 | 1 | 31 | 39 | 2 | 31 | 1 | 1 |
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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