Surf Forecasts:
Number Fours surf forecast from 23 Aug 2026:
- Most powerful swell: Thursday 27 Aug, 11AM (local time) - 3.5ft (1.0m), 17s period, S swell with 594 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 1.0m 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 Thursday (Aug 27) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 11AM (Thu 27th Aug) | 3.5ft (1.0m) 17s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at the next couple of weeks. The outlook for Number Fours kicks off Saturday the 22nd of August, but honestly, we're in for a bit of a waiting game. For the first stretch, we've got a persistent easterly swell, but it's getting hammered by a fresh to strong cross-off wind out of the ENE, which is just ruining any chance of decent surf. The wave heights are around 5ft to 7ft, but it's all short-period, messy energy. The combined swell energy is moderate. It's going to be a frustrating, choppy mess.
That pattern drags on right through the end of the month. We start seeing a shift around Wednesday the 26th afternoon, when a tiny bit of longer-period S swell shows up, with 2ft, but it's still under that same cross-off wind. This marginal, onshore wind pattern continues for a solid week, with those S swell windows mixing in with the ENE wind chop. Honestly, not much to get excited about until we get into the first week of September.
Now, here’s the good bit. Wednesday the 2nd of September is where things finally turn. That morning we get a proper window. We’ve got a 3ft S swell with a long 16-second period, and the wind drops right out to a light breeze from the ENE. That’s the kind of setup that will clean Number Fours right up. It’s a reef break, so those long-period pulses will wrap in nicely. This is your standout window.
Later that same Wednesday afternoon, the swell bumps up to 6ft from the ENE with an 8-second period and a gentle breeze. The combined energy is strong, so there's plenty of push, but the wind direction remains cross-off. The morning is the pick of the day for sure.
After that, we lose the wind window. Thursday the 3rd and Friday the 4th of September see the easterly swell sticking around at 6ft to 6ft, but that fresh to strong cross-off breeze comes roaring back, making conditions rough again. The energy stays high, but it's all wind-affected. Not the best for a standard paddle surf, it's more of a kite-surfing setup.
Saturday the 5th of September offers a glimmer. The morning sees 5ft ENE swell and a strong breeze. By the afternoon, the energy jumps to a very strong level with 6ft swell.
So, to wrap it up: the first week and a bit is a write-off. Wednesday the 2nd of September is your one true standout opportunity for clean, long-period waves at Number Fours, but it's a brief window. The following days have the size but lack the clean conditions.
Stay patient,
Rusty.
Short Range ForecastMostly dry. Warm (max 27°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 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | ||||||||||||||
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 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | S 18 | S 19 | S 17 | S 16 | S 16 | S 14 | S 14 | ENE 7 |
Wave Graph | ||||||||||||||||||||
302 | 346 | 276 | 350 | 277 | 277 | 254 | 261 | 310 | 310 | 247 | 233 | 307 | 351 | 594 | 427 | 482 | 260 | 324 | 212 | |
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 | 1:06AM0.23m | 1:52PM0.66m | 1:46AM0.26m | 2:26PM0.67m | 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 | |||||||
Low Tide | 9:00PM0.16m | 6:08AM0.10m | 9:18PM0.14m | 6:59AM0.08m | 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 | |||||||
— | — | 6:11 | — | — | 6:11 | — | — | 6:11 | — | — | 6:13 | — | — | 6:13 | — | — | 6:13 | — | — | |
6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 24 | 25 | 25 | 23 | 24 | 25 | 27 | 26 | 24 | 23 | 23 | 21 | 23 | 23 | 25 | 23 | 23 | 23 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SSW 16 | SW 15 | SSW 15 | SW 14 | SSW 14 | SSW 13 | 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 |
255 | 212 | 116 | 191 | 100 | 168 | 156 | 127 | 85 | 142 | 121 | 215 | 307 | 351 | 594 | 427 | 482 | 260 | 324 | 173 | |
Swell 2 Height (m) Direction Period (s) | W 10 | SSE 12 | S 13 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SSE 7 | SSW 16 | SSW 12 | SSW 12 | S 18 | SSW 13 | SSW 13 | S 12 | SSW 12 | NNE 8 | E 15 | E 14 | E 13 |
53 | 50 | 90 | 35 | 96 | 50 | 47 | 15 | 146 | 81 | 81 | 165 | 135 | 135 | 72 | 46 | 20 | 109 | 99 | 126 | |
Swell 3 Height (m) Direction Period (s) | S 12 | WNW 10 | SSW 15 | S 11 | SSW 15 | SSW 18 | SSE 7 | SSE 12 | SSE 12 | SSE 6 | SSW 18 | SSE 12 | SSE 6 | SSW 16 | N 8 | W 9 | E 16 | SSW 11 | SSW 19 | SSW 10 |
47 | 34 | 76 | 22 | 71 | 62 | 21 | 46 | 28 | 8 | 109 | 27 | 8 | 50 | 6 | 7 | 46 | 22 | 36 | 18 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 |
302 | 346 | 276 | 350 | 277 | 277 | 254 | 261 | 310 | 310 | 247 | 233 | 165 | 139 | 143 | 162 | 145 | 182 | 177 | 212 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 42 | 39 | 39 | 42 | 39 | 39 | 31 | 31 | 39 | 39 | 31 | 33 | 31 | 31 | 31 | 31 | 31 | 31 | 126 | 33 |
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.











