
Surf Forecasts:
Number Fours surf forecast from 1 Aug 2026:
- Most powerful swell: Saturday 1 Aug, 2PM (local time) - 10ft (3.0m), 8s period, ENE swell with 1,108 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 3.0m 8s and forecast to arrive on Saturday (Aug 01) 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 1.3m 6s period and expected on Friday (Aug 07) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Sat 1st Aug) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it. We’ve got a bit of a rough stretch ahead at Number Fours. The good news? There’s plenty of swell on the cards over the next couple of weeks. The bad news? The wind is going to be a persistent issue, blowing cross-offshore from the ENE for almost the entire run, which isn’t going to do us any favours for proper clean waves. The water temp is sitting at 81°, which is pretty much average for this time of year, so no surprises there.
For the first few days, we’re looking at a strong pulse of easterly swell. On Saturday morning August 1st, the swell is a solid 10 ft from the east, but it’s short period stuff, just 8 seconds, and that combined wave energy is pumping at a very strong 1501. Thing is, with those strong breeze conditions and the swell being so short and fat, the surf quality is poor. It’s going to be a messy, bumpy ocean. Sunday and Monday see the swell drop a bit, down to 7 ft and then 6 ft, but the wind stays stiff and the period remains short at 8 seconds. The reef at Number Fours is exposed, so it’ll be getting all that energy, but the conditions are just not cooperating. This isn't really a paddle-surfing situation with this much wind and lumpy water – more like a kite session.
Things cool down mid-week. Tuesday August 4th is the best of a so-so bunch. The swell drops to 5 ft to 5 ft, but the period stretches out to 11 seconds, which is a proper groundswell. The wind also backs off to a gentler breeze. The combined energy is moderate at 637, and the marginal surf forecast suggests the tide might be an issue. It’s not going to be epic, but it’s the cleanest the lineup will look this week.
After that, we hit a major lull. From Wednesday August 5th all the way through to the following Tuesday August 11th, the surf is poor to marginal at best. You’re looking at swells under 3 ft, often mixed with long-period SSW energy (14 to 16 seconds) but the wind just ruins it. The combined energy drops from 378 down into the low hundreds, indicating very weak wave energy. Honestly, this is the kind of dry spell where you don’t even bother checking the cam. A blank run like this is pretty normal when the wind has the upper hand.
Now, into the second week, things get a little more interesting, but it’s still a gamble. Wednesday August 12th brings a promising pulse of south swell with a very long period of 17 seconds. The swell height is only 4 ft, but that energy is moderate at 1089. The wind is still cross-off from the ENE, but if it manages to clock around or ease off, this groundswell could produce some proper shaped waves peeling down the reef. Thursday morning August 13th keeps that 4 ft south swell with a 15-second period, but the wind is back up, and by the afternoon, it’s a strong breeze again. These long-period south swells can be classy at Number Fours if the wind plays ball, but right now it’s a “we’ll see” kind of deal.
The final weekend, August 15th and 16th, sees a return of the easterly swell, pushing back up over 7 ft (10 ft on Saturday afternoon), but it’s a repeat of the beginning: short period (8 seconds) and strong winds. The combined energy is very strong, but the poor surf conditions mean it’s a messy, blown-out mess for experts only, if anyone.
If I had to pick one standout, it’s the Tuesday morning, August 4th. The 5 ft east swell with a 11-second period, under a gentler breeze, is the closest we’ll get to a clean, ripable wave. It’s not a classic, but given the run we’re looking at, it’s the best on offer. Keep an eye on Wednesday August 12th and Thursday August 13th for that long-period south swell, but don’t hold your breath until the wind forecast improves.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Sat morning, min 24°C on Sun night). Winds decreasing (strong winds from the ENE on Sat morning, light winds from the NE by Mon night). | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Wed afternoon, min 24°C on Tue morning). Mainly fresh winds. | ||||||||||||||||||||
Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | |||||||||||||||
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) | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | SSW 14 | ENE 8 | SW 14 | SW 21 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
1332 | 893 | 956 | 662 | 627 | 578 | 385 | 331 | 701 | 582 | 476 | 396 | 275 | 203 | 144 | 81 | 122 | 102 | 115 | 158 | 308 | |
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 | 5:55PM0.59m | 6:49AM0.38m | 6:24PM0.52m | 7:47AM0.42m | 6:55PM0.44m | 8:56AM0.47m | 7:27PM0.36m | 10:11AM0.53m | 8:07PM0.29m | 11:24AM0.60m | 9:30PM0.22m | 12:27PM0.67m | 11:32PM0.19m | ||||||||
Low Tide | 11:14AM0.11m | 00:48AM0.05m | 12:06PM0.16m | 1:15AM0.04m | 1:14PM0.22m | 1:46AM0.04m | 2:52PM0.27m | 2:23AM0.03m | 5:19PM0.27m | 3:10AM0.03m | 7:39PM0.21m | 4:08AM0.02m | 8:34PM0.16m | ||||||||
6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
— | 7:09 | — | — | 7:08 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 21 | 22 | 22 | 23 | 23 | 22 | 25 | 24 | 24 | 27 | 27 | 26 | 26 | 28 | 27 | 25 | 25 | 25 | 24 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | E 14 | E 14 | E 14 | E 14 | E 13 | E 13 | E 12 | SSW 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | ENE 8 | SSW 14 | SW 14 | SSW 14 | SSW 14 | SSW 14 |
127 | 196 | 194 | 246 | 192 | 125 | 84 | 108 | 48 | 582 | 476 | 396 | 275 | 203 | 144 | 59 | 81 | 102 | 77 | 73 | 75 | |
Swell 2 Height (m) Direction Period (s) | S 12 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSE 9 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 15 | SSW 14 | SSW 14 | SSE 11 | ENE 8 | SSE 11 | SW 20 | SW 19 |
42 | 123 | 131 | 133 | 67 | 57 | 53 | 29 | 9 | 46 | 53 | 47 | 47 | 88 | 82 | 81 | 24 | 22 | 23 | 99 | 96 | |
Swell 3 Height (m) Direction Period (s) | N 8 | S 11 | S 11 | N 9 | N 9 | SW 13 | SW 13 | SW 13 | S 13 | SSE 10 | SSE 14 | SW 15 | SSE 13 | SSW 11 | SSE 12 | SSE 11 | S 10 | SSE 11 | SW 21 | SSE 8 | NE 11 |
5 | 39 | 22 | 15 | 14 | 42 | 42 | 41 | 13 | 9 | 38 | 57 | 56 | 39 | 49 | 25 | 17 | 40 | 115 | 12 | 19 | |
Wind waves Height (m) Direction Period (s) | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | — | — | — | — | — | — | ENE 5 | ENE 8 | ENE 6 | ENE 6 | ENE 7 | ENE 7 |
1332 | 893 | 956 | 662 | 627 | 578 | 385 | 331 | 701 | — | — | — | — | — | — | 39 | 122 | 65 | 111 | 158 | 308 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 147 | 44 | 42 | 128 | 155 | 34 | 1 | 34 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 31 | 31 | 31 | 31 | 31 | 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)
Latest Updates
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.











