Surf Forecasts:
Number Fours surf forecast from 20 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 5AM (local time) - 5ft (1.6m), 17s period, E swell with 1,383 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 1.6m 17s and forecast to arrive on Sunday (Jul 26) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 8s period and expected on Saturday (Jul 25) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 5AM (Sun 26th Jul) | 5ft (1.6m) 17s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright, folks, Rusty here. Let's talk about Number Fours and what's coming our way for the next couple of weeks.
Right off the bat, the first part of the window is looking pretty average. The swell is small and the wind is a constant cross-off, which isn't ideal. The water’s sitting at about 80°F, which is pretty much normal for this time of year, so no surprises there.
The first real glimmer of hope doesn't show up until the morning of the 28th of July. That Tuesday morning at Number Fours is my standout. We’re looking at clean 6ft waves from the ENE, and the wind is a light breeze, just 6 mph. That’s going to make for some super clean, fun waves. The energy is strong, and it’s a reef break, so it’ll handle that groundswell nicely. This one’s for the experienced crew, as the swell is a solid size, but it’s going to be worth it. Be aware that crowds are sometimes an issue here.
The 29th of July is also a treat. Another clear morning with a 6ft ENE swell and a light 6 mph wind. This is a very similar setup, just as clean, and another solid option. Following that, the 30th of July morning still has some decent energy with a 5ft swell and light winds, but the afternoon drops off a cliff.
After that, the second week looks a bit messy. From the 31st of July through to the 2nd of August, the swell goes small and the wind picks up, making it pretty poor. The 3rd of August brings a bit more size back, with 7ft from the ENE, but the wind is moderate, so it’s not going to be as clean as that late July run.
The 4th of August is similar, with a 6ft to 6ft ENE swell, but again, moderate winds keep it from being a standout. The swell period is short, around 9 seconds, so it's not the best quality.
In short, your best bet is to aim for the 28th and 29th of July. That’s the real window of opportunity. The rest is a mixed bag. If you're a beginner, anything over 5ft is going to be a challenge, especially when it hits 8ft on the 2nd of August – that's expert-only territory, and the short period won't help.
Rusty.
Short Range ForecastLight rain (total 7mm), mostly falling on Tue morning. Warm (max 27°C on Mon afternoon, min 24°C on Wed night). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Thu morning. Warm (max 26°C on Sat morning, min 24°C on Fri night). Winds decreasing (strong winds from the ENE on Thu afternoon, light winds from the NE by Sat night). | ||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | |||||||||||||||
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 | S 16 | S 15 | S 14 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | E 7 | SSW 20 | SSW 18 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | E 18 | E 17 | E 16 | E 16 | E 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 161 | 321 | 339 | 329 | 311 | 277 | 317 | 426 | 363 | 412 | 395 | 464 | 358 | 482 | 558 | 414 | 607 | 1275 | 1301 | 1253 | 1275 |
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 | 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 | 2:56PM0.68m | 2:32AM0.21m | |||||||
Low Tide | 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 | 7:08AM0.02m | 10:27PM0.11m | |||||||||
 | |  |  |  | | | |  | | | | | |  | | | | | | | |
 | 6:00 | — | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — |
 | — | 7:15 | — | — | 7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:13 | — |
mm | — | — | 1 | 2 | — | 4 | — | — | — | 1 | — | — | — | — | — | 1 | — | — | — | — | — |
Temp °C | 26 | 27 | 25 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 25 | 25 | 24 |
Feels °C | 25 | 25 | 24 | 26 | 24 | 24 | 22 | 22 | 23 | 21 | 21 | 22 | 22 | 21 | 22 | 25 | 23 | 22 | 23 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | S 14 | S 16 | S 15 | ENE 7 | S 14 | S 13 | S 13 | E 11 | E 12 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 19 | E 18 | E 17 | E 16 | E 16 | E 15 |
| kJ | 142 | 321 | 339 | 153 | 311 | 277 | 215 | 123 | 139 | 412 | 395 | 464 | 329 | 340 | 232 | 391 | 607 | 1275 | 1301 | 1253 | 1275 |
Swell 2 Height (m) Direction Period (s) | S 16 | SW 18 | SW 16 | S 14 | SW 16 | E 13 | E 12 | S 10 | S 13 | S 12 | S 11 | S 13 | S 12 | S 12 | S 20 | SSW 16 | SSW 18 | SSW 18 | SSW 16 | S 16 | SSW 16 |
| kJ | 135 | 81 | 69 | 329 | 67 | 121 | 138 | 78 | 157 | 97 | 90 | 85 | 105 | 102 | 299 | 223 | 572 | 547 | 469 | 522 | 416 |
Swell 3 Height (m) Direction Period (s) | SW 18 | W 12 | E 12 | SW 17 | E 11 | SW 15 | SSW 24 | SSW 23 | SSW 22 | SSW 16 | SW 16 | S 11 | SSW 15 | S 21 | E 16 | E 14 | S 11 | S 11 | S 11 | SE 12 | SE 11 |
| kJ | 83 | 11 | 12 | 72 | 39 | 60 | 317 | 426 | 363 | 99 | 127 | 56 | 93 | 231 | 181 | 148 | 39 | 37 | 35 | 5 | 5 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 7 | ENE 7 | — | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 8 | NE 8 |
| kJ | 161 | 169 | 197 | — | 132 | 176 | 171 | 145 | 240 | 377 | 268 | 461 | 358 | 482 | 558 | 414 | 477 | 452 | 353 | 335 | 276 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 31 | 1 | 31 | 31 | 31 | 31 | 34 | 31 | 39 | 46 | 31 | 32 | 42 | 31 | 28 | 39 | 1 | 31 | 126 | 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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