Surf Forecasts:
Number Fours surf forecast from 30 Aug 2026:
- Most powerful swell: Saturday 5 Sep, 11PM (local time) - 8ft (2.4m), 13s period, ENE swell with 1,915 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 2.4m 13s and forecast to arrive on Saturday (Sep 05) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11PM (Sat 5th Sep) | 8ft (2.4m) 13s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, it’s Rusty here, and I’ve had a good look at what’s coming our way for Number Fours (reef). Let’s be real, the next 16 days are a bit of a mixed bag. We’ve got a lot of swell pulsing through, but the wind is going to be a constant battle. The water is sitting at about 81°, which is pretty much bang on average for this time of year, so no surprises there.
The forecast kicks off on Sunday the 30th of August, but don’t get too excited. We’re looking at a 7ft swell from the ENE with a short, punchy 7-second period, but that 25 mph ENE cross-off wind is making a mess of things. The energy is moderate (646), but the conditions are just plain poor. That’s going to be the story for the first few days. We’ve got a solid run of 5ft to 7ft ENE swell through Sunday and Monday, but the wind stays strong, so the surf is going to be lumpy and hard to enjoy. It’s a tough start.
Then we get a little shift on Wednesday the 2nd of September. Swell drops right back to 3ft, but it’s a long-period groundswell from the S with a 16-second period. The energy is still moderate (888), but the wind is still a fresh 22 mph cross-off, so it’s a marginal call. It’s a glimmer, but not a standout.
The real story – and the only thing that gets my heart pumping – is the second week. From Monday the 7th of September through to Thursday the 10th, Number Fours is going to be absolutely pumping in size. We’re talking a 13ft ENE swell on Monday afternoon with a very long 12-second period. The energy is through the roof (4946). That’s proper, expert-only territory. If you’re a confident surfer on a reef, this is the window. The wind is the main issue – it’s still strong and cross-off – but on Tuesday the 8th of September morning, we get a brief window of offshore wind from the N at 25 mph. The swell is 10ft with a 9-second period, and it’s clean. It’s going to be a paddle, but the reward will be there. After that, the swell slowly drops, and we’re back to smaller, wind-affected waves through the end of the run.
Honestly, the standout is that Monday the 7th to Wednesday the 9th of September window. The energy is massive, the swell is solid, and if you can pick your moment with the wind, you’ll have a session to remember. Just be aware, this spot can get crowded sometimes, so get in early.
Alright, that’s the reality of it. The first week is a write-off, but the second week holds some serious power. Keep an eye on that wind.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sun morning, min 25°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Fri night. Warm (max 27°C on Wed afternoon, min 25°C on Wed night). Winds decreasing (near gales from the ENE on Fri morning, fresh winds from the E by Fri night). | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 16 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 13 |
Wave Graph | |||||||||||||||||||||
358 | 325 | 299 | 432 | 428 | 422 | 463 | 549 | 520 | 422 | 443 | 526 | 574 | 557 | 1204 | 1502 | 1098 | 867 | 686 | 629 | 1556 | |
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 | cross | cross | cross-off |
High Tide | 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 | 12:05PM0.69m | 00:18AM0.21m | ||||||||
Low Tide | 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 | 8:03PM0.13m | ||||||||
6:13 | — | — | 6:13 | — | — | 6:13 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | |
— | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 3 | 4 | 5 |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 26 | 27 | 27 | 27 |
Feels °C | 23 | 23 | 23 | 23 | 23 | 22 | 24 | 23 | 22 | 24 | 25 | 24 | 22 | 22 | 21 | 21 | 21 | 21 | 29 | 27 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 16 | S 12 | SSW 15 | SSW 15 | SSW 14 | S 19 | SSW 18 | S 18 | S 17 | S 16 | S 16 | S 15 | S 14 | S 14 | S 13 | SE 11 | SSE 11 | S 11 | S 10 | ENE 8 | SSW 8 |
171 | 100 | 199 | 144 | 138 | 192 | 329 | 314 | 364 | 422 | 318 | 275 | 206 | 195 | 130 | 130 | 140 | 396 | 426 | 629 | 67 | |
Swell 2 Height (m) Direction Period (s) | SSW 12 | SSW 16 | S 11 | S 11 | S 11 | S 10 | SSW 14 | S 12 | S 10 | SSE 10 | S 11 | E 13 | S 10 | E 12 | SSE 12 | S 13 | E 14 | E 13 | E 13 | S 9 | SSE 8 |
46 | 162 | 59 | 57 | 55 | 51 | 80 | 49 | 35 | 19 | 40 | 123 | 18 | 105 | 61 | 128 | 236 | 273 | 326 | 264 | 37 | |
Swell 3 Height (m) Direction Period (s) | SSE 12 | W 11 | S 20 | S 21 | SSW 19 | SW 14 | S 10 | SW 14 | SW 14 | SW 14 | E 14 | S 11 | SSW 13 | S 10 | E 15 | SW 12 | SSW 13 | SSW 20 | SSW 18 | SSW 18 | SSW 16 |
48 | 9 | 30 | 34 | 122 | 54 | 30 | 52 | 51 | 30 | 66 | 37 | 17 | 18 | 39 | 6 | 59 | 37 | 121 | 121 | 103 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 13 |
358 | 325 | 299 | 432 | 428 | 422 | 463 | 549 | 520 | 402 | 443 | 526 | 574 | 557 | 1204 | 1502 | 1098 | 867 | 686 | 323 | 1556 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 39 | 42 | 31 | 39 | 39 | 31 | 31 | 126 | 4 | 31 | 39 | 31 | 44 | 204 | 201 | 201 | 201 | 128 | 58 | 4 | 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.











