Surf Forecasts:
Number Fours surf forecast from 13 Aug 2026:
- Most powerful swell: Sunday 16 Aug, 8AM (local time) - 13ft (4.0m), 9s period, E swell with 2,478 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 4.0m 9s and forecast to arrive on Sunday (Aug 16) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 12s period and expected on Thursday (Aug 13) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8AM (Sun 16th Aug) | 13ft (4.0m) 9s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it for Number Fours.
Honestly, I’m looking at a rough stretch ahead. The first real chance to even talk about surfing comes on Wednesday afternoon, the 12th of August, and even then it’s not a day to get excited about. We’ve got a solid south swell rolling in at 3 ft, but the wind is a cross-off from the ENE at 22 mph, which is just too strong. That’s shredding the surface and making it a real battle. The water is sitting at 81°, which is pretty much normal for this time of year, so at least you won’t need a thick wetsuit.
Thursday the 13th offers a bit more size, pushing 3 ft to 4 ft from the S with a nice long period of 15-16 seconds, but that ENE wind is still howling at 19-22 mph. The wave energy is moderate (840-937), but the wind is the story here, and it’s a bad one. It’s just too messy.
Things go downhill from there. Friday the 14th sees a shift to a short-period, onshore ENE windswell at 7 ft to 7 ft with a period of only 8 seconds and the same nasty cross-off wind. The energy picks up a bit (937-1013), but it’s a washing machine. Saturday the 15th is a write-off – we’re looking at 12 ft to 13 ft of short-period, wind-affected slop with near gale-force winds (31 mph). The energy is strong (1829-2563), but that’s just raw power, no shape. This is kite-surfing territory, not a day to be on a paddle board unless you’re a masochist.
Sunday the 16th is still big at 12 ft early, dropping to 8 ft in the afternoon, with a risk of thunderstorms and the same strong ENE wind. The energy is very strong (2466-1671). It’s still a mess.
After that, we get a slow, painful decline. The swell drops, but the wind barely lets up. From Monday the 17th all the way through the end of the period on the 27th of August, the surf is marginal at best. You’ll see pulses of 2 ft to 4 ft of mixed swell, mostly from the SSW, with weak to moderate energy (285-779). The wind is a constant cross-off from the ENE, ranging from 12 to 19 mph. There are a few brief windows of cleaner conditions, but the swell is too small and the period is too long for the beach break, making it break straight and mushy.
The only real “standout” in this whole 16-day window isn’t really a standout at all. The best look you get is possibly on the mornings of the 25th or 26th of August, over a week away. You might see 3 ft to 4 ft from the SSW with a period of 14-16 seconds, and the wind is a moderate 16-19 mph. The energy is moderate (577-779). It’s still a cross-off wind, but it’s the smallest wind we’ll see on a day with any size. It’s a long-shot, promising but very uncertain. Don’t book the day off.
Honestly, the best advice I can give for Number Fours is to take a break. The winds are relentless, and the swell is either too small, too big, or too short-period. It’s a bleak run, but that’s the way it goes sometimes.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu morning, min 25°C on Wed afternoon). Winds increasing (moderate winds from the ENE on Wed night, strong winds from the ENE by Sat morning). | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Sun night. Warm (max 26°C on Sat afternoon, min 25°C on Sat night). Winds decreasing (near gales from the ENE on Sat afternoon, moderate winds from the E by Sun night). | |||||||||||||||||||
Wed 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | ||||||||||||||
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 18 | S 16 | S 16 | S 15 | S 15 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | E 9 | E 9 | E 9 | ENE 9 | ENE 8 | ENE 8 | S 14 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | ||||||||||||||||||||
498 | 520 | 501 | 662 | 537 | 514 | 509 | 865 | 1592 | 2353 | 1979 | 1646 | 819 | 561 | 318 | 260 | 203 | 188 | 139 | 121 | |
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 |
High Tide | 4:13PM0.75m | 4:30AM0.36m | 4:48PM0.69m | 5:17AM0.40m | 5:22PM0.62m | 6:06AM0.44m | 5:54PM0.53m | 6:57AM0.47m | 6:24PM0.45m | 7:54AM0.49m | 6:52PM0.37m | 8:59AM0.51m | 7:16PM0.30m | |||||||
Low Tide | 11:08PM0.04m | 9:58AM0.03m | 11:36PM0.04m | 10:49AM0.08m | 00:03AM0.04m | 11:43AM0.14m | 00:30AM0.05m | 12:43PM0.20m | 00:58AM0.06m | 1:59PM0.25m | 1:27AM0.08m | 3:56PM0.27m | 2:01AM0.10m | |||||||
— | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | 6:09 | — | — | |
7:02 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 1 | 4 | 4 | — | — | — | — | — | — |
Temp °C | 26 | 26 | 27 | 27 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 26 | 25 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 23 | 24 | 24 | 24 | 22 | 22 | 23 | 24 | 23 | 21 | 21 | 22 | 25 | 26 | 24 | 23 | 22 | 24 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 | S 13 | S 13 | S 13 | SSE 12 | SSE 10 | S 7 | ENE 8 | S 14 | S 13 | S 13 | ENE 7 | S 13 |
498 | 520 | 501 | 662 | 537 | 411 | 411 | 243 | 225 | 168 | 173 | 737 | 725 | 100 | 318 | 260 | 170 | 121 | 139 | 80 | |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 13 | SSW 12 | W 12 | W 11 | W 12 | E 11 | E 12 | W 11 | W 13 | SE 13 | S 16 | S 16 | S 14 | S 14 | S 6 | SSE 7 | SW 17 | S 13 | W 12 |
218 | 170 | 113 | 11 | 10 | 11 | 63 | 103 | 10 | 30 | 44 | 83 | 127 | 250 | 264 | 20 | 17 | 74 | 119 | 25 | |
Swell 3 Height (m) Direction Period (s) | W 12 | W 12 | W 12 | SW 19 | SW 18 | SW 18 | SSW 18 | W 11 | SW 17 | S 16 | S 18 | W 12 | W 12 | S 16 | S 6 | SSW 19 | W 11 | SSE 7 | SW 18 | SSE 6 |
25 | 25 | 11 | 14 | 13 | 12 | 30 | 9 | 12 | 42 | 56 | 25 | 25 | 81 | 20 | 37 | 10 | 9 | 79 | 8 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | ENE 6 | ENE 6 | ENE 6 | E 7 | ENE 8 | ENE 8 | ENE 8 | ENE 9 | E 9 | E 9 | E 9 | ENE 9 | ENE 8 | — | ENE 7 | ENE 7 | ENE 7 | — | ENE 7 |
195 | 194 | 226 | 261 | 491 | 514 | 509 | 865 | 1592 | 2353 | 1979 | 1646 | 819 | 561 | — | 237 | 203 | 188 | — | 121 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 42 | 31 | 32 | 127 | 31 | 39 | 48 | 127 | 155 | 156 | 128 | 201 | 48 | 39 | 39 | 39 | 31 | 31 | 39 | 1 |
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.











