
Surf Forecasts:
Number Fours surf forecast from 20 Jul 2026:
- Most powerful swell: Sunday 26 Jul, 2PM (local time) - 5ft (1.6m), 16s period, E swell with 1,285 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 16s and forecast to arrive on Sunday (Jul 26) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 8s period and expected on Monday (Jul 20) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Sun 26th Jul) | 5ft (1.6m) 16s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright, let's talk Number Fours in proper units. This forecast is a slow burn to start. We've got a big hole of nothing much worth surfing from now until about the 24th of July. The wind is howling from the ENE, 18 to 25 mph, blowing straight across the face, ruining everything. The swell is either tiny or short-period junk. Save your energy.
The first real sniff of something good is on Monday the 28th of July. That's over a week out, so don't book the trip yet. But we finally see some proper size: a 8ft swell from the ENE with a long 13-second period. That's groundswell with serious grunt – the combined energy reading is 2097. The wind is still cross-off from the NE, but it's eased to 12 mph. This is for intermediate crew and up, way too much for a learner.
The real standout, the one to circle on the calendar, is Wednesday the 29th of July. The morning offers a 6ft ENE swell, dropping to 5ft in the afternoon, but the period stays solid at 11 seconds. The wind turns light, 9 mph from the N, and goes *offshore* in the afternoon. That is clean, crystalline surf. The combined energy is strong at 779-941. The water temperature sits around 80°F, which is normal for the season. This is the session.
The afternoon of Friday the 31st of July also looks decent with a 6ft ENE swell and a light cross-shore breeze, but it's not as polished as the 29th.
One thing: Number Fours wants swell from the SSE, but we're getting it from the ENE. That's a tricky angle for this reef, sometimes making it a bit sectiony. For the long-period stuff (like that 16-second energy on the 26th and 27th), a normal beach break would close out, but a reef handles it beautifully.
So, bottom line: the first week is a total dud. The second week is where it's at. Monday the 28th of July is big and powerful, but Wednesday the 29th of July is your best shot at perfection with that light offshore wind. Be aware, crowds are sometimes an issue here.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sun afternoon, min 24°C on Sun night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Wed night). Mainly strong winds. | |||||||||||||||||||
Sun 19 | Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | ||||||||||||||
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 | E 8 | ENE 8 | S 16 | S 15 | S 14 | S 14 | ENE 7 | ENE 7 | SSW 23 | SSW 22 | SSW 20 | ENE 7 | SSW 18 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | SSW 18 | E 16 |
Wave Graph | ||||||||||||||||||||
277 | 221 | 199 | 321 | 339 | 329 | 246 | 227 | 138 | 426 | 363 | 412 | 395 | 464 | 529 | 637 | 689 | 459 | 572 | 732 | |
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 | 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 | ||||||||
— | — | 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 25 |
Feels °C | 23 | 23 | 25 | 24 | 24 | 24 | 24 | 23 | 22 | 22 | 22 | 21 | 21 | 22 | 22 | 23 | 21 | 22 | 23 | 22 |
Swell 1 Height (m) Direction Period (s) | S 12 | NNE 8 | S 14 | S 16 | S 15 | S 14 | S 14 | S 13 | E 12 | E 11 | E 12 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | E 16 |
73 | 44 | 142 | 321 | 339 | 329 | 246 | 219 | 138 | 123 | 139 | 412 | 395 | 464 | 329 | 340 | 232 | 391 | 572 | 732 | |
Swell 2 Height (m) Direction Period (s) | S 18 | SSW 12 | S 16 | SW 18 | SW 16 | SW 17 | SW 16 | E 13 | S 13 | SSW 23 | S 13 | S 12 | S 11 | E 11 | S 12 | S 12 | S 20 | SSW 16 | E 15 | SSW 18 |
106 | 44 | 135 | 81 | 69 | 72 | 67 | 121 | 128 | 426 | 157 | 99 | 93 | 57 | 105 | 69 | 299 | 198 | 153 | 547 | |
Swell 3 Height (m) Direction Period (s) | W 12 | S 18 | SW 18 | W 12 | E 12 | E 12 | E 11 | SW 15 | S 11 | S 13 | SSW 22 | SSW 16 | SW 16 | S 11 | SSW 15 | S 21 | S 12 | E 16 | S 11 | S 11 |
25 | 97 | 83 | 11 | 12 | 25 | 40 | 60 | 56 | 125 | 363 | 99 | 127 | 56 | 89 | 231 | 69 | 125 | 61 | 21 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | E 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 |
277 | 221 | 199 | 234 | 191 | 153 | 181 | 227 | 132 | 144 | 240 | 307 | 350 | 444 | 529 | 637 | 689 | 459 | 425 | 522 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 130 | 1 | 1 | 31 | 2 | 31 | 31 | 31 | 31 | 39 | 31 | 39 | 126 | 39 | 42 | 127 | 32 | 31 | 126 | 31 |
Best forecast wave conditions in Oahu | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
Header Global | ||||||||||||||||||||
- Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)
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.










