Surf Forecasts:
Number Fours surf forecast from 7 Aug 2026:
- Most powerful swell: Thursday 13 Aug, 2AM (local time) - 4ft (1.2m), 16s period, S swell with 762 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 1.2m 16s and forecast to arrive on Thursday (Aug 13) at 2AM. 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 Saturday (Aug 08) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 2AM (Thu 13th Aug) | 4ft (1.2m) 16s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright, Rusty here. Let's chew through what this stretch looks like for Number Fours.
Honestly, the first week and a half is a bit of a grind. There's swell kicking around, but that ENE wind just doesn't let up – a stiff cross-off breeze churning things up from the 7th through the middle of the month. The wave reports keep yelling "marginal" or "poor." That first little bump on Friday the 7th of August shows 1ft of SW groundswell, but with 15 mph cross-off wind, it's a no-go. The 8th and 9th bring some moderate energy (combined levels in the 500s) but the period is short – 6 to 7 seconds – and that constant wind will just mess up any potential.
You have to wait until Wednesday the 19th of August for the real bright spot. That morning, the wind drops to a gentle 9 mph cross-off from the east. The water temp is 81°, right on the money for August. Swell sits at a clean 6ft from the ENE with a 9-second period, and the report says *expect very good surf conditions*. That's your standout. Combined energy is 510 (moderate) and with that light breeze, you'll get real shape. It's an intermediate reef break, fairly consistent, and only occasional crowds – you might have some real estate. That morning of the 19th is the one to aim for.
After that, the breeze picks back up into moderate range, but there's a nice second act on Saturday the 22nd of August. Swell drops to 2ft, but it's a clean SSW groundswell with a long 16-second period, and the wind is a gentle 9 mph cross-off. Combined energy is 454 (moderate). The report says *expect good surf conditions*. That long period will wrap into the reef beautifully, giving you smooth, lined-up waves. That afternoon on the 22nd is a real treat.
The rest of the second week is mostly marginal, with ENE swell and moderate to fresh winds. The bigger stuff hitting around the 16th and 17th (over 7ft from the ENE, combined energy over 1000) is expert territory with that strong breeze making it a proper battle.
So here's the takeaway: Wednesday the 19th of August morning is the clear winner for clean, fun waves. Saturday afternoon the 22nd is your backup for classic, long-period glass.
Rusty, out.
Short Range ForecastMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Fri morning). Mainly fresh winds. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Mon afternoon, min 25°C on Mon night). Mainly fresh winds. | ||||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | |||||||||||||||
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 21 | SW 20 | SSW 19 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 |
Wave Graph  | |||||||||||||||||||||
 kJ | 115 | 99 | 148 | 226 | 232 | 262 | 261 | 319 | 337 | 280 | 212 | 252 | 215 | 269 | 276 | 509 | 498 | 762 | 734 | 559 | 524 |
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 | 12:27PM0.67m | 11:32PM0.19m | 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 | ||||||||
Low Tide | 8:34PM0.16m | 5:14AM0.01m | 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 | ||||||||
 |  |  | | | | | | | | |  | | | | | | | | | | |
 | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — |
 | — | 7:06 | — | — | 7:06 | — | — | 7:05 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:02 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 27 | 27 | 25 | 26 | 26 | 25 | 27 | 27 | 26 |
Feels °C | 25 | 26 | 24 | 23 | 23 | 23 | 24 | 24 | 24 | 27 | 26 | 26 | 25 | 25 | 23 | 23 | 23 | 23 | 24 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | NE 7 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 17 | SSW 12 | SSW 16 | SSW 15 | SSW 15 | SSW 15 | SSW 14 | SSW 14 | SSW 13 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 |
| kJ | 21 | 25 | 107 | 113 | 101 | 99 | 184 | 86 | 223 | 184 | 176 | 186 | 165 | 269 | 239 | 509 | 498 | 762 | 734 | 559 | 524 |
Swell 2 Height (m) Direction Period (s) | SSW 14 | SSW 14 | SSW 19 | SW 18 | SW 18 | SW 18 | SSW 13 | SSW 16 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SSE 8 | S 20 | SSW 13 | SSW 13 | W 12 | W 12 | W 12 | W 11 |
| kJ | 77 | 73 | 148 | 162 | 154 | 150 | 96 | 102 | 56 | 56 | 42 | 23 | 41 | 28 | 276 | 215 | 218 | 11 | 11 | 11 | 10 |
Swell 3 Height (m) Direction Period (s) | SW 21 | SW 20 | NE 11 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSW 18 | SSE 10 | SSE 10 | SSE 10 | SSE 7 | SE 9 | S 21 | SSE 9 | W 13 | W 12 | S 20 | SE 9 | SW 19 | SW 18 |
| kJ | 115 | 99 | 30 | 19 | 19 | 19 | 19 | 102 | 19 | 19 | 18 | 10 | 21 | 79 | 7 | 30 | 25 | 8 | 3 | 14 | 13 |
Wind waves Height (m) Direction Period (s) | ENE 5 | ENE 5 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 30 | 31 | 109 | 226 | 232 | 262 | 261 | 319 | 337 | 280 | 212 | 252 | 215 | 188 | 181 | 212 | 149 | 290 | 232 | 299 | 317 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 31 | 31 | 33 | 39 | 39 | 31 | 33 | 31 | 31 | 31 | 31 | 31 | 32 | 31 | 31 | 39 | 31 | 31 | 44 | 31 |
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.
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