
Surf Forecasts:
Number Fours surf forecast from 21 Jul 2026:
- Best quality surf: Tuesday 28 Jul, 8AM (local time) - 6ft (1.8m), 13s period, E swell with cross-offshore winds.
- Most powerful swell: Monday 27 Jul, 2PM (local time) - 6ft (1.8m), 14s period, E swell with 1,321 kJ wave energy.
- Next surfable swell (1★+): Tuesday 28 Jul, 8AM (local time) - 6ft (1.8m), 13s period with E 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 Tuesday (Jul 28) at 8AM. The primary swell is predicted to be 1.8m and 13s period. 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 1.8m 14s and forecast to arrive on Monday (Jul 27) 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 1.9m 8s period and expected on Saturday (Jul 25) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Tue 28th Jul) | 6ft (1.8m) 13s |
| Best Surf | 8AM (Tue 28th Jul) | 6ft (1.8m) 13s |
| Most Powerful | 2PM (Mon 27th Jul) | 6ft (1.8m) 14s |
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 (Number Fours) has in store for us over the next couple of weeks. We’ve got a bit of a slow start, so don’t be in a rush to grab your board just yet.
We’re looking at a real mixed bag to kick things off. The water’s sitting at a warm 80°, which is pretty much spot on for this time of year, so no surprises there.
The first real surfable window doesn’t open up until Friday the 24th of July. We’ll see a bump in size to about 7ft, but it’s coming from the ENE with a short, weak period of only 7 seconds. Combined energy is moderate (1009 - 1067). The wind is a cross-offshore breeze, so it’ll be clean, but that short period means it’s going to be a bit of a messy, close-out shorebreak. Not the best, but something to get wet on.
Saturday the 25th keeps that same funky ENE swell around 7ft in the morning, still with that short 8-second period. The energy is picking up (1230), but it’s still a beach-break style slop. By the afternoon, the swell shifts to the SSW at 3ft but with a much nicer 18-second period – that’s proper groundswell energy. The combined energy is still strong (1085), but the size is tiny.
The real standout, and the one that’s got my attention, hits on Sunday the 26th of July. The morning sees a solid 4ft E swell with a 16-second period, and the combined energy jumps to a massive 1705. That’s a lot of water moving. The wind is a clean cross-off from the NE. This is the pick of the week. That long period groundswell, even at that size, will pour over the reef at Number Fours with some real grunt. It’s an intermediate spot, so you’ll want your wits about you, but the quality will be there. The afternoon sees the swell bump to 5ft, staying strong.
This pulse of E swell carries through Monday the 27th and Tuesday the 28th, with waves holding around 5ft to 6ft, periods dropping from 14 to 13 seconds. The energy is still high (1198 - 1295). The wind stays a consistent cross-offshore breeze, so conditions will remain clean. It’s a good run of solid, rideable surf.
We get another push on Wednesday the 29th of July, with the swell hitting 7ft from the ENE with a 12-second period. That’s getting into the territory where it’s a bit much for beginners, but for the intermediate crew, it’s going to be a fun, punchy wave. The energy is strong (1385).
Things start to taper off towards the end of the month. Thursday the 30th sees the swell drop right back, with a tiny 2ft SW swell in the afternoon, and the energy levels fall off a cliff (267). The wind goes light and cross-shore, but there’s just no power.
Then we hit a proper lull. From Friday the 31st of July all the way through the weekend and into early next week, it’s mostly poor conditions with strong winds and small, weak swell. Not worth paddling out for.
The next potential window opens up on Monday the 3rd of August, with the swell building back to 6ft from the ENE, but the period is still a short 8-9 seconds. The energy is solid (1073 - 1115) but the quality will be lacking. It’s a bit of a wait-and-see.
The most promising long-range look is on Tuesday the 4th of August. The swell holds at 7ft from the ENE, but the period finally stretches out to a nice 12 seconds, and the energy is strong (1431). The wind is cross-off. It’s a week and a half away, so don’t book the trip yet, but it’s a nice light on the horizon.
Stay safe, and I’ll see you out there.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue morning. Warm (max 26°C on Tue morning, min 24°C on Wed night). Mainly strong winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Sat night. Warm (max 26°C on Fri afternoon, min 24°C on Fri morning). Mainly strong winds. | ||||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | Monday 27 | |||||||||||||||
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) | S 14 | S 14 | S 13 | SSW 24 | SSW 23 | SSW 22 | ENE 7 | E 7 | SSW 18 | SSW 18 | SSW 17 | ENE 7 | ENE 8 | SSW 18 | ENE 8 | E 15 | E 16 | E 16 | E 14 | E 14 | E 14 |
Wave Graph | |||||||||||||||||||||
329 | 311 | 277 | 317 | 426 | 363 | 412 | 395 | 503 | 329 | 349 | 482 | 471 | 572 | 547 | 563 | 959 | 1206 | 1055 | 1321 | 1297 | |
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 | 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 | 3:29PM0.70m | 3:10AM0.23m | |||||||
Low Tide | 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 | 7:51AM0.01m | 10:49PM0.10m | |||||||||
6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
— | 7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:13 | — | — | 7:12 | — | |
mm | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | 1 | — | — |
Temp °C | 26 | 26 | 25 | 25 | 25 | 25 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Feels °C | 25 | 25 | 24 | 23 | 22 | 23 | 21 | 21 | 21 | 21 | 23 | 21 | 22 | 22 | 23 | 23 | 22 | 23 | 23 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | NE 7 | ENE 7 | S 13 | E 11 | S 13 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | SSW 18 | E 15 | E 16 | E 16 | E 14 | E 14 | E 14 |
136 | 67 | 140 | 215 | 123 | 157 | 412 | 395 | 464 | 329 | 340 | 232 | 391 | 572 | 547 | 563 | 959 | 1206 | 1055 | 1321 | 1297 | |
Swell 2 Height (m) Direction Period (s) | S 14 | S 14 | S 13 | E 12 | SSW 23 | SSW 22 | S 12 | S 11 | S 11 | S 12 | S 12 | S 20 | SSW 16 | S 11 | E 16 | SSW 16 | SSW 16 | SSW 16 | SSW 15 | SSW 15 | SSW 14 |
329 | 311 | 277 | 138 | 426 | 363 | 97 | 90 | 56 | 143 | 104 | 296 | 223 | 64 | 249 | 469 | 341 | 333 | 228 | 222 | 213 | |
Swell 3 Height (m) Direction Period (s) | SW 17 | E 7 | E 13 | SSW 24 | S 13 | SW 18 | SSW 16 | SW 16 | S 13 | SSW 16 | S 21 | S 12 | S 11 | E 13 | S 11 | SSW 11 | SSW 10 | SW 9 | SW 8 | SW 8 | SSE 10 |
72 | 46 | 121 | 317 | 125 | 150 | 100 | 127 | 85 | 94 | 231 | 100 | 61 | 55 | 37 | 38 | 36 | 21 | 11 | 11 | 10 | |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 7 | ENE 7 | ENE 6 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | NE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | NE 8 | NE 7 | NE 8 |
— | — | — | 192 | 166 | 201 | 395 | 388 | 503 | 293 | 349 | 482 | 471 | 362 | 493 | 392 | 322 | 287 | 229 | 136 | 136 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 2 | 0 | 32 | 34 | 31 | 39 | 44 | 39 | 39 | 44 | 39 | 33 | 39 | 31 | 31 | 31 | 31 | 31 | 31 | 1 |
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.










