Surf Forecasts:
Number Fours surf forecast from 30 Aug 2026:
- Most powerful swell: Saturday 5 Sep, 8PM (local time) - 10ft (3.0m), 8s period, ENE swell with 995 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 3.0m 8s and forecast to arrive on Saturday (Sep 05) at 8PM. 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 | 8PM (Sat 5th Sep) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get stuck into this outlook for Number Fours. Don’t go getting your hopes up just yet – it’s looking like a bit of a slow burn over the next couple of weeks.
We’re kicking off with a patch of pretty average stuff. The water temp is sitting at 81°, which is about average for this time of year, so nothing wild there. Right from Saturday the 29th of August, we’ve got a cross-off wind blowing hard at 25 mph and a lumpy, short-period 5 ft ENE swell giving the wave energy a reading of just 463. The conditions are just poor – that wind is killing any chance of quality. This tough run of cross-off winds and ENE swell carries right on through into the first few days of September, with wave energy climbing but the quality never getting there. It’s not until Wednesday the 2nd of September that something interesting happens.
On Wednesday the 2nd, the swell flips direction to a clean S swell, a proper groundswell with a long period of 16 seconds. Now, that’s promising. The height drops to around 3 ft to 3 ft, but the long period means there’s some proper energy in the water, giving us a combined energy reading of 848. However, it’s still crossed-off by a 19 mph ENE wind, so it stays marginal.
From there, it’s a real grind of marginal surf all the way through to the middle of the second week. The wind stays stubbornly cross-off from the ENE or NE, and the swell, mostly from the ENE, bumps up in size but never really cleans up. The best on offer during this whole period is shaping up to be the weekend of the 5th and 6th of September. On Saturday the 5th, we’re looking at 8 ft from the ENE, but with 25 mph winds it’s blown-out, so you’d only look at it if you’re desperate. The real standout is Sunday the 6th of September. By the afternoon, the swell is pushing 13 ft from the ENE with an 11-second period and the wave energy is roaring at 4141 – that’s strong. Sure, it’s still cross-off with a strong breeze, but there’s raw power there. That 13 ft swell is expert-only territory, no doubt about it. Just keep in mind this is a reef break with mostly an ENE swell direction, not the optimum SSE, so the shape might not be perfect.
If you’re a beginner, this whole forecast is a write-off. The swell tops 5 ft almost every day and hits well over 8 ft on that 6th of September, so leave the logs at home. Honestly, for most of this stretch, with the strong winds and solid swell, Number Fours looks like it’d be more fun for kite surfing than paddling out. The water does turn glassy on the 13th of September with a gentle breeze and an SSE swell, but the height is only 2 ft. It’s too weak to get excited about.
So, there you go. A long wait for that big, gnarly Sunday on the 6th of September. The rest is a lesson in patience.
Rusty.
Short Range ForecastSome drizzle, heaviest during Sun night. Warm (max 26°C on Sat afternoon, min 25°C on Sat night). Mainly strong winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Tue afternoon, min 25°C on Tue night). Mainly fresh winds. | |||||||||||||||||||
Sat 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | ||||||||||||||
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 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | S 16 | S 16 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | ||||||||||||||||||||
189 | 557 | 371 | 293 | 237 | 343 | 382 | 410 | 392 | 432 | 443 | 422 | 318 | 275 | 331 | 296 | 283 | 305 | 344 | 526 | |
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 | 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 | 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 | — | — | 6:15 | — | — | 6:15 | — | — | 6:15 | — | — | |
6:50 | — | — | 6:49 | — | — | 6:47 | — | — | 6:46 | — | — | 6:45 | — | — | 6:45 | — | — | 6:44 | — | |
mm | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 22 | 22 | 22 | 21 | 22 | 23 | 23 | 22 | 24 | 24 | 23 | 24 | 24 | 23 | 23 | 23 | 22 | 23 | 24 | 22 |
Swell 1 Height (m) Direction Period (s) | E 12 | S 12 | 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 | E 13 | E 13 | E 13 |
110 | 102 | 171 | 100 | 199 | 144 | 138 | 192 | 329 | 314 | 364 | 422 | 318 | 275 | 268 | 192 | 173 | 222 | 273 | 199 | |
Swell 2 Height (m) Direction Period (s) | S 13 | SSW 17 | SSW 12 | SSW 16 | S 11 | S 11 | S 11 | S 10 | S 10 | S 12 | S 10 | SSE 10 | S 11 | E 13 | E 13 | E 12 | E 12 | S 13 | S 13 | S 13 |
89 | 186 | 46 | 162 | 59 | 82 | 55 | 50 | 30 | 75 | 35 | 33 | 58 | 125 | 121 | 103 | 68 | 170 | 121 | 119 | |
Swell 3 Height (m) Direction Period (s) | S 12 | W 12 | SSE 12 | ENE 11 | ENE 10 | S 21 | SSW 19 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | E 14 | S 11 | SSE 10 | S 10 | E 15 | SW 12 | SSW 13 | SSW 20 |
75 | 11 | 48 | 40 | 37 | 34 | 122 | 54 | 50 | 51 | 51 | 30 | 66 | 58 | 33 | 31 | 104 | 6 | 17 | 37 | |
Wind waves Height (m) Direction Period (s) | 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 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 |
189 | 557 | 371 | 293 | 237 | 343 | 382 | 410 | 392 | 432 | 443 | 363 | 318 | 270 | 331 | 296 | 283 | 305 | 344 | 526 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 126 | 126 | 39 | 44 | 31 | 39 | 39 | 31 | 31 | 126 | 31 | 31 | 126 | 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.











