
Surf Forecasts:
Number Fours surf forecast from 23 Jul 2026:
- Best quality surf: Wednesday 29 Jul, 11PM (local time) - 5ft (1.5m), 10s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 28 Jul, 11PM (local time) - 7ft (2.1m), 12s period, ENE swell with 1,290 kJ wave energy.
- Next surfable swell (1★+): Wednesday 29 Jul, 11PM (local time) - 5ft (1.5m), 10s period with ENE swell.
Best Forecast Surf Conditions for Number Fours this week:
The surf forecast for Number Fours over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jul 29) at 11PM. The primary swell is predicted to be 1.5m and 10s period with a secondary swell of 0.6m and 13s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Number Fours in the next 16 days are 2.1m 12s and forecast to arrive on Tuesday (Jul 28) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 7s period and expected on Sunday (Jul 26) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Wed 29th Jul) | 5ft (1.5m) 10s |
| Best Surf | 11PM (Wed 29th Jul) | 5ft (1.5m) 10s |
| Most Powerful | 11PM (Tue 28th Jul) | 7ft (2.1m) 12s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright, Rusty here, and I’ve got the lowdown on the next 16 days for Number Fours. This is a reef setup, so expect a bit of gnarliness under the surface.
The outlook is a bit of a mixed bag, really. The first week is a proper grind, with the wind blowing hard and cross-off from the ENE, making it tough to get clean lines. The water temperature is about average for the time of year, so no nasty surprises there.
The first real chance for a wave comes on Thursday the 23rd of July, but it’s barely a whisper. We’re looking at a tiny 2 ft SSW swell with a very long period of 20 seconds. The combined energy is weak (1006), and those 25 mph winds, while cross-off, are just too strong to make it any fun. The score is a struggle, so I’d give it a miss.
Friday the 24th of July shows a jump in size to 7 ft, but it’s a short-period ENE windswell of only 7 seconds. The wind is still a fresh to strong breeze, and the quality is still marginal. At 7 ft, it’s getting a bit much for the beginners, but the short, bumpy period won’t do the experts any favours either.
Saturday the 25th of July looks a bit better. The morning has 6 ft of ENE swell, period up to 8 seconds, with a fresh breeze. The afternoon sees a drop in size to 3 ft, but the period jumps to 18 seconds from the SSW. This is a proper groundswell, and the energy is moderate (1107). It’s still a bit of a battle with the wind, but that long period could offer some nice, walled-up sections on the reef.
The best bet in the whole window is shaping up for Tuesday the 28th of July. We’ve got 6 ft to 7 ft of ENE swell, with a solid period of 13 seconds in the morning and 12 seconds in the afternoon. The combined energy is strong (1354 in the morning, 1268 in the afternoon). The wind is a moderate to fresh breeze, still cross-off, but it’s the right direction for this spot. The swell is a bit overhead, so it’s for the experienced crew, but the potential for some long, grinding waves is there. The offshore wind direction is a perfect match for the optimum swell direction, so this is the standout session. Keep an eye on the crowds, as it could get a bit busy.
The run from Tuesday the 29th of July through to the end of the first week is a consistent mix of chest to head-high ENE groundswell, but the wind stays on it. The energy is moderate to strong, but it’s never quite clean enough to be epic.
Then we hit a dry spell. From Thursday the 30th of July, the wind starts shifting around, and the quality drops off. There’s a gap of a few days with no real recs, until we get to the 1st of August. That Saturday brings a 6 ft to 6 ft windswell, but it’s short-period and the wind is howling at 25 mph. Not worth it.
Sunday the 2nd of August has some size, 8 ft, but it’s still a short period windswell with a fresh breeze. It’s marginal at best.
The real tease is Monday the 3rd of August. We get a 4 ft groundswell from the East with a very long 16-second period. The energy is strong (1114). This could be a sneaky session if the wind drops, but it’s still a fresh breeze. It’s a long-range call, so keep your fingers crossed.
The last few days of the forecast are a slow fade-out, with small, weak swells. The 7th of August is a complete write-off with tiny 1 ft SSW swell and almost no energy (75).
So, to wrap it up: Tuesday the 28th of July is your best shot. The rest of the window is a lot of work for not much reward. Keep an eye on that Monday the 3rd of August for a potential long-period gem.
Rusty.
Short Range ForecastSome drizzle, heaviest during Fri morning. Warm (max 26°C on Thu afternoon, min 25°C on Wed night). Mainly strong winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Tue afternoon, min 24°C on Sat night). Mainly fresh winds. | ||||||||||||||||||
Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | Tuesday 28 | ||||||||||||||
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) | SSW 22 | ENE 7 | ENE 7 | SSW 18 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | SSW 18 | SSW 18 | ENE 8 | SSW 16 | E 14 | E 14 | E 13 | E 13 | ENE 13 | ENE 12 | E 12 |
Wave Graph | |||||||||||||||||||
363 | 412 | 395 | 464 | 446 | 456 | 526 | 430 | 578 | 547 | 469 | 452 | 485 | 613 | 792 | 852 | 1175 | 1114 | 940 | |
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 |
High Tide | 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 | 3:29PM0.70m | 3:10AM0.23m | 3:59PM0.70m | 3:49AM0.25m | ||||||
Low Tide | 8:25PM0.21m | 9:13PM0.17m | 5:34AM0.05m | 9:41PM0.14m | 6:23AM0.04m | 10:05PM0.12m | 7:08AM0.02m | 10:27PM0.11m | 7:51AM0.01m | 10:49PM0.10m | 8:31AM0.01m | 11:11PM0.09m | |||||||
— | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:03 | — | — | |
7:14 | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | — | 7:12 | — | |
mm | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 |
Feels °C | 23 | 21 | 22 | 21 | 22 | 22 | 22 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | S 13 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 18 | SSW 16 | E 14 | E 14 | E 14 | E 13 | E 13 | SSW 14 | SSW 14 | E 12 |
157 | 412 | 395 | 464 | 329 | 340 | 232 | 391 | 578 | 547 | 469 | 368 | 485 | 613 | 792 | 852 | 143 | 143 | 940 | |
Swell 2 Height (m) Direction Period (s) | SSW 22 | S 12 | S 11 | S 11 | S 12 | S 12 | S 20 | SSW 16 | S 11 | E 15 | E 14 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 | SSE 10 | SSE 10 | S 14 |
363 | 99 | 125 | 55 | 143 | 102 | 296 | 223 | 39 | 72 | 260 | 452 | 333 | 228 | 222 | 213 | 18 | 9 | 184 | |
Swell 3 Height (m) Direction Period (s) | SW 18 | SSW 16 | SW 16 | S 13 | SSW 15 | S 21 | S 12 | S 11 | E 13 | E 12 | S 11 | S 11 | S 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | S 9 | SW 21 |
150 | 100 | 127 | 85 | 93 | 231 | 100 | 64 | 54 | 47 | 20 | 20 | 8 | 11 | 22 | 20 | 18 | 2 | 18 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | NE 7 | NE 10 | ENE 13 | ENE 12 | NNE 7 |
263 | 395 | 350 | 388 | 446 | 456 | 526 | 430 | 436 | 425 | 389 | 337 | 352 | 289 | 165 | 216 | 1175 | 1114 | 85 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 31 | 39 | 126 | 39 | 42 | 126 | 39 | 31 | 126 | 31 | 33 | 34 | 31 | 31 | 126 | 2 | 31 | 31 | 1 |
Best forecast wave conditions in Oahu | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.










