
Surf Forecasts:
Number Fours surf forecast from 19 Jul 2026:
- Most powerful swell: Saturday 25 Jul, 5PM (local time) - 3ft (0.9m), 18s period, SSW swell with 572 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 0.9m 18s and forecast to arrive on Saturday (Jul 25) at 5PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 8s period and expected on Monday (Jul 20) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5PM (Sat 25th Jul) | 3ft (0.9m) 18s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what Number Fours has in store for us over the next couple of weeks.
Right off the bat, I gotta be straight with you – the next few days are a tough watch. The wind is blowing strong from the ENE, mostly around 19 to 22 mph, and it’s blowin’ cross-off. That’s not the worst direction, but the swell is just not cooperating. Sunday the 19th and Monday the 20th are showing poor surf conditions with weak, short-period ENE windswell. The combined energy is only in the 400s to low 600s, which is weak. The water is sitting at 80° – pretty normal for this time of year, so that’s not the issue.
We’ve got a bit of a blank run here, with no real good surf until around Wednesday the 22nd afternoon. That’s when the energy finally jumps up to around 1144 (moderate to strong), and we see a 5ft swell from the ENE, but it’s a short 7-second period. The wind is still a fresh cross-off at 22 mph, so it’s going to be lumpy and hard to love. It’s a marginal call at best.
The real standout, and the one you want to circle on your calendar, is the morning of Sunday the 26th of July. We’ve got a 4ft swell rolling in from the east with a solid 16-second period – that’s proper groundswell, meaning long, powerful lines. The wind eases to a moderate 16 mph from the ENE, still cross-off, which should keep the surface reasonably clean. The combined energy is a strong 1169. This is the best looking window in the whole forecast. The only caveat is that long period E swell can be a bit straight at a beach break, but Number Fours is a reef, so it should handle that energy beautifully. The consistency is fair, and crowds are only sometimes an issue, so you might get a few waves to yourself.
A couple of other days are worth a mention, but they’re less certain. The morning of Tuesday the 28th of July shows a 7ft ENE swell with a 13-second period and strong energy of 1523. That’s a big, powerful swell, but with that size and a fresh cross-off wind, it’s going to be a handful. That’s expert territory. The morning of Sunday the 2nd of August also looks promising in the long-range – a 4ft SSW swell with a 16-second period and huge energy of 1464, with a lighter 9 mph cross-shore wind. But that’s over a week and a half away, so keep an eye on it, but don’t book the day off work just yet.
For the rest of the second week, it’s a mixed bag of marginal conditions and poor surf. The energy drops right off at the end of July and into early August, with lots of readings in the 200s and 400s, which is weak. The wind stays on the fresh side, so it’s gonna be a grind.
Rusty, signing off.
Short Range ForecastSome drizzle, heaviest during Tue night. Warm (max 26°C on Sun morning, min 24°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Fri morning, min 24°C on Wed night). Mainly strong winds. | ||||||||||||||||||||
Sunday 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | |||||||||||||||
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 8 | ENE 8 | ENE 6 | ENE 8 | S 16 | S 15 | S 14 | S 14 | ENE 7 | ENE 7 | ENE 11 | ENE 7 | SSW 20 | ENE 7 | SSW 18 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | SSW 18 | SSW 18 |
Wave Graph | |||||||||||||||||||||
266 | 298 | 188 | 226 | 321 | 267 | 329 | 246 | 247 | 145 | 553 | 363 | 412 | 395 | 464 | 360 | 407 | 542 | 452 | 572 | 547 | |
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 | cross-off |
High Tide | 8:53AM0.38m | 7:45PM0.43m | 10:04AM0.43m | 8:19PM0.34m | 11:13AM0.49m | 8:56PM0.27m | 12:12PM0.54m | 10:06PM0.22m | 1:02PM0.59m | 11:46PM0.19m | 1:44PM0.62m | 00:59AM0.18m | 2:22PM0.66m | 1:51AM0.19m | |||||||
Low Tide | 2:03PM0.22m | 2:48AM0.03m | 3:52PM0.27m | 3:23AM0.04m | 6:20PM0.26m | 4:02AM0.05m | 8:25PM0.21m | 9:13PM0.17m | 5:34AM0.05m | 9:41PM0.14m | 6:23AM0.04m | 10:05PM0.12m | |||||||||
5:58 | — | — | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
— | 7:15 | — | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | |
mm | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | 1 |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 23 | 23 | 23 | 25 | 23 | 23 | 24 | 24 | 23 | 22 | 22 | 23 | 21 | 21 | 22 | 23 | 23 | 22 | 22 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 12 | S 14 | S 16 | S 15 | S 14 | S 14 | S 13 | E 12 | S 10 | E 12 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 18 |
93 | 95 | 44 | 142 | 321 | 267 | 329 | 246 | 219 | 138 | 78 | 141 | 412 | 395 | 464 | 329 | 340 | 232 | 391 | 572 | 547 | |
Swell 2 Height (m) Direction Period (s) | S 19 | S 18 | S 18 | S 16 | SW 18 | SW 16 | SW 17 | SW 16 | E 13 | S 13 | SSW 23 | S 13 | S 12 | S 11 | S 11 | S 12 | S 12 | S 20 | SSW 16 | S 10 | E 15 |
66 | 106 | 97 | 135 | 81 | 69 | 72 | 67 | 121 | 128 | 426 | 157 | 98 | 93 | 56 | 143 | 100 | 296 | 223 | 72 | 372 | |
Swell 3 Height (m) Direction Period (s) | W 12 | W 12 | NNE 8 | SW 18 | W 12 | E 12 | E 12 | E 11 | SW 15 | S 11 | S 13 | SSW 22 | SSW 16 | SW 16 | S 13 | SSW 16 | S 21 | S 12 | S 11 | E 16 | S 9 |
25 | 25 | 23 | 83 | 11 | 12 | 25 | 39 | 60 | 58 | 87 | 363 | 100 | 127 | 85 | 94 | 231 | 100 | 81 | 132 | 24 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 6 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 11 | ENE 7 | E 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 |
266 | 298 | 188 | 226 | 214 | 173 | 153 | 176 | 247 | 145 | 553 | 307 | 334 | 371 | 427 | 360 | 407 | 542 | 452 | 419 | 459 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 44 | 1 | 2 | 33 | 1 | 31 | 32 | 31 | 31 | 39 | 31 | 42 | 46 | 31 | 39 | 42 | 31 | 31 | 39 | 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.










