
Surf Forecasts:
Number Fours surf forecast from 8 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 2PM (local time) - 23ft (7.0m), 12s period, E swell with 13,402 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 7.0m 12s and forecast to arrive on Saturday (Aug 15) 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 1.1m 7s period and expected on Sunday (Aug 09) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2PM (Sat 15th Aug) | 23ft (7.0m) 12s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
G’day, Rusty here. Let’s have a look at the next couple of weeks at Number Fours.
It’s a bit of a slow burn, to be honest. The surf kicks off small and a little messy, then there’s a big pulse of energy mid-period that’s going to be way too much for this place, and then it settles back down. The standout days are a while off – we’re looking at Thursday the 20th and Friday the 21st as the real windows where everything lines up.
Right now, Saturday the 8th is pretty weak, but the water’s a warm 81°, about average for this time of year. We’ve got a cross-off breeze and clean waves, but it’s tiny. The swell is only 2ft from the SW with a long 18-second period, and the combined energy is weak at 400. It’s a grovel, not a go-out.
We roll through Sunday the 9th, Monday the 10th, and Tuesday the 11th with a bit more size, but it’s short-period ENE windswell, around 5ft to 5ft. The period is only 7-8 seconds, so it’s not got much push. The energy is moderate, ranging from 429 to 555. It’s clean with that cross-off, but it’s marginal. You’ll get waves, but they won't be great.
Wednesday the 12th and Thursday the 13th see a shift. The swell direction swings around to the S/SSW, with a much longer period of 15-18 seconds. The heights drop to 3ft to 4ft, but that longer period means more organized lines. Energy picks up into the low 1000s – moderate. Still, the score is marginal. There's potential, but you need the right tide.
Then things get big in a hurry. Friday the 14th sees the swell jump to 8ft to 10ft from the ENE, with a short 8-second period. The energy is strong, at 1364 to 2023. That’s already a lot for this spot, and it’s pushing towards expert-only territory, but the real monster is Saturday the 15th. The swell is 20ft to 25ft, with the combined energy absolutely huge at 8102 to 15054. The wind is a near gale. That is not a paddle-out. That is a full-on tow-in day, and even then, it’s too big and messy for Number Fours. The rip will be insane. This is more of a kite-surfing spectacle than anything else.
Sunday the 16th is blown out with a cross-onshore SE wind. The swell drops to 7ft to 10ft, but it’s choppy and ugly. No good.
After that, we’re back to the grind. From Monday the 17th through Wednesday the 19th, there’s plenty of swell in the 5ft to 6ft range, but all short-period ENE windswell. It’s clean, but it’s not holding shape well. It’s a week of waist-to-chest-high, mediocre walls, and nothing that’s going to get your heart racing.
Now, for the standouts. Thursday the 20th and Friday the 21st are your windows. Thursday morning, the swell is a consistent 5ft, and the wind drops to a gentle 15 km/h cross-off. The energy is moderate, hitting 595. It’s the cleanest it’s been all run, and the forecast says expect very good surf. That’s your best bet for a proper session.
Friday the 21st builds slightly to 7ft, with a bit more period at 9 seconds. The wind is still offshore, and the energy is strong, around 977. It’s more size, but it’s also getting more powerful. This is the bigger, punchier option, but Thursday looks like the pick for quality and crowd control.
Crowds are just listed as “sometimes” here, so you might get it to yourself if you’re lucky.
After that, the weekend of the 22nd and 23rd drops back to 6ft to 7ft of short-period ENE swell. It’s clean but unremarkable. A bit of a fizzle to end the window.
So, in the end: don’t waste your time on Friday the 15th, that’s for madmen. Mark Thursday the 20th on the calendar, it’s the one. Friday the 21st is also worth it if you want a bit more power. The long-range stuff is promising, but don't book your flights yet.
Stay salty.
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Mon morning, min 25°C on Sat morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Tue morning, min 25°C on Tue night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | |||||||||||||||
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) | SW 18 | SW 18 | SW 18 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | ENE 8 | ENE 8 | ENE 8 | ENE 10 |
Wave Graph | |||||||||||||||||||||
162 | 172 | 150 | 254 | 250 | 301 | 252 | 259 | 286 | 208 | 269 | 276 | 509 | 498 | 520 | 734 | 662 | 623 | 783 | 1168 | 2756 | |
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 | 1:22PM0.73m | 00:59AM0.19m | 2:10PM0.78m | 2:02AM0.22m | 2:54PM0.80m | 2:55AM0.26m | 3:35PM0.79m | 3:43AM0.31m | 4:13PM0.75m | 4:30AM0.36m | 4:48PM0.69m | 5:17AM0.40m | 5:22PM0.62m | ||||||||
Low Tide | 9:09PM0.12m | 6:20AM-0.01m | 9:40PM0.08m | 7:20AM-0.02m | 10:10PM0.06m | 8:15AM-0.02m | 10:40PM0.05m | 9:08AM-0.00m | 11:08PM0.04m | 9:58AM0.03m | 11:36PM0.04m | 10:49AM0.08m | 00:03AM0.04m | ||||||||
6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | |
— | 7:06 | — | — | 7:05 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:02 | — | — | 7:01 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
Feels °C | 23 | 23 | 23 | 25 | 24 | 24 | 27 | 25 | 26 | 25 | 24 | 23 | 23 | 23 | 24 | 23 | 22 | 23 | 23 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 13 | E 7 | SSW 17 | SSW 12 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | ESE 14 | ESE 14 |
113 | 101 | 92 | 186 | 86 | 198 | 184 | 176 | 186 | 165 | 269 | 243 | 509 | 498 | 520 | 734 | 662 | 537 | 416 | 492 | 765 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | SW 18 | SSW 13 | SSW 13 | SSW 16 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SE 9 | S 20 | SSW 13 | SSW 13 | SSW 13 | W 12 | W 12 | W 11 | ESE 13 | S 14 | S 14 |
162 | 154 | 99 | 96 | 102 | 56 | 56 | 42 | 23 | 40 | 20 | 276 | 218 | 218 | 170 | 11 | 11 | 10 | 165 | 333 | 239 | |
Swell 3 Height (m) Direction Period (s) | NE 10 | SSE 10 | SW 18 | SSE 10 | SSW 18 | W 11 | SSE 10 | SE 10 | SSE 9 | SSE 9 | S 21 | SSE 9 | W 13 | W 12 | W 12 | SE 10 | SW 19 | SW 18 | W 12 | SSW 18 | W 11 |
17 | 19 | 150 | 19 | 102 | 20 | 19 | 23 | 17 | 16 | 79 | 7 | 30 | 25 | 11 | 4 | 14 | 13 | 11 | 30 | 9 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 6 | NE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 10 |
125 | 172 | 86 | 254 | 250 | 301 | 252 | 259 | 286 | 208 | 167 | 194 | 160 | 170 | 342 | 285 | 360 | 623 | 783 | 1168 | 2756 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 42 | 31 | 31 | 39 | 31 | 31 | 32 | 31 | 31 | 31 | 1 | 31 | 39 | 31 | 44 | 44 | 39 | 44 | 128 | 201 |
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.











