
Surf Forecasts:
Number Fours surf forecast from 8 Aug 2026:
- Most powerful swell: Friday 14 Aug, 8PM (local time) - 8ft (2.5m), 8s period, ENE swell with 789 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 2.5m 8s and forecast to arrive on Friday (Aug 14) at 8PM. 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 5s period and expected on Friday (Aug 07) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Fri 14th Aug) | 8ft (2.5m) 8s |
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 is cookin’ up for the next couple of weeks.
Right off the bat, I gotta tell ya, it’s a tough start. For the first few days, the wind is blowin’ straight out of the ENE at 18 to 22 mph, and while it’s technically cross-off, the swell is tiny and weak. Friday the 7th has a combined energy of only 192, and the water’s a warm 81°, which is about average for this time of year. But 1 ft of swell from the SW with a 20-second period? That’s a long-period groundswell, sure, but it’s just not enough to push through that wind. Poor surf conditions, and that’s the story all weekend.
We get a little bump in size on Saturday the 8th afternoon, with 5 ft from the ENE, but the period drops to a junk 6 seconds – that’s pure wind swell, short and choppy. The energy climbs to 474, but it’s still a mess. The wind stays strong at 22 mph. This carries into Sunday the 9th and Monday the 10th, with 5 ft of short-period, lumpy ENE swell. The energy is moderate, in the 400-500 range, but the onshore component of that cross-off makes it look more like a kite-surfing session than a paddle-in day.
Now, pay attention to Tuesday the 11th afternoon. The swell drops to 3 ft, but it shifts to the SSW with a 14-second period. The energy jumps to 545. It’s marginal, but that’s a cleaner signal. The wind is still a stiff 22 mph, so it’s not gonna be glassy, but it’s a step in the right direction.
The real standout, and the one I’m gettin’ excited about, is Wednesday the 12th and Thursday the 13th. We get a solid S swell coming through. Wednesday morning sees 3 ft at 18 seconds, with energy at 921. By Thursday morning, it’s 4 ft, still from the S, with a 16-second period, and the energy jumps to a very strong 1093. This is proper groundswell. The wind is still cross-off from the ENE, but it’s cleaner. That long period will wrap around Number Fours, which is a reef setup, and it’s exposed to the SSE. The optimum direction is SSE, and this S swell is close enough to be a beauty. The period is over 15 seconds, so expect longer waits between sets, but the waves that come through will have real shape and power. This is the best on offer, hands down. It’s moderately sized, not too big for most, but get on it early.
After that, things get gnarly, but not in a good way. From Friday the 14th through to Monday the 17th, we see a huge ENE swell build. We’re talking 8 ft to 12 ft of short-period (8-9 seconds) wind swell. The energy is off the charts: 1278 on Saturday the 15th afternoon, 1843 on Sunday morning, and peaking at 2252 on Monday the 17th. That’s immense, raw power. But the wind is a near gale at 31 mph at times. This is pure, churning, dangerous ocean. For experts only, and even then, it’s going to be a battle. The wind and short period will make it a bumpy, close-out mess. Honestly, this setup is way more interesting for a kite surfer than a paddle surfer.
The swell starts to fade Tuesday the 18th, with 6 ft from the ENE, but the energy is still moderate at 897. The wind drops to 16 mph, which is better. Then it gets tiny again, with 1 ft to 2 ft from the S and SW with long periods (12-17 seconds), but the energy is weak (51-255). The wind is still cross-off or light, and the conditions are “poor” or “ordinary” right through to the 22nd.
So, to sum it up: the first week is a write-off. The standout is Thursday the 13th with that S groundswell. The second week has a massive, dangerous wind swell that’s for experts only, and then it fades to nothing. The forecast is solid for the near-term, and the long-range standouts are promising but less certain.
Rusty, signing off.
Short Range ForecastMostly dry. Warm (max 27°C on Fri afternoon, min 25°C on Fri night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Mon afternoon, min 25°C on Mon night). Mainly fresh winds. | |||||||||||||||||||
Fri 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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 20 | SSW 19 | SW 18 | ENE 6 | SW 18 | ENE 7 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | E 7 | ENE 7 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 |
Wave Graph | ||||||||||||||||||||
99 | 148 | 162 | 200 | 150 | 210 | 256 | 381 | 240 | 240 | 269 | 208 | 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 |
High Tide | 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 | |||||||
— | — | 6:07 | — | — | 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 | 27 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 27 | 26 | 25 | 26 | 26 | 25 | 27 | 27 | 26 |
Feels °C | 26 | 24 | 23 | 24 | 23 | 24 | 24 | 24 | 24 | 26 | 26 | 25 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 14 | SSW 14 | 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 |
73 | 107 | 113 | 101 | 92 | 159 | 86 | 223 | 184 | 176 | 186 | 165 | 269 | 243 | 509 | 498 | 762 | 734 | 559 | 524 | |
Swell 2 Height (m) Direction Period (s) | SW 20 | SSW 19 | SW 18 | SW 18 | SSW 13 | SSW 13 | SSW 16 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SSE 9 | S 20 | SSW 13 | SSW 13 | W 12 | W 12 | W 12 | W 11 |
99 | 148 | 162 | 154 | 99 | 96 | 102 | 56 | 56 | 42 | 23 | 40 | 16 | 276 | 218 | 215 | 11 | 11 | 11 | 10 | |
Swell 3 Height (m) Direction Period (s) | S 11 | NE 11 | NE 10 | SSE 10 | SW 18 | SSE 10 | SSW 18 | SSE 10 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | S 21 | W 10 | W 13 | W 12 | S 20 | SSE 10 | SE 10 | SW 18 |
20 | 30 | 17 | 19 | 150 | 19 | 102 | 19 | 19 | 36 | 17 | 16 | 79 | 8 | 30 | 25 | 8 | 9 | 4 | 13 | |
Wind waves Height (m) Direction Period (s) | ENE 5 | ENE 6 | ENE 6 | ENE 6 | NE 7 | ENE 7 | ENE 8 | ENE 7 | ENE 8 | ENE 8 | E 7 | ENE 7 | ENE 7 | E 7 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
44 | 90 | 160 | 200 | 118 | 210 | 256 | 381 | 240 | 240 | 269 | 208 | 181 | 262 | 194 | 212 | 308 | 350 | 293 | 487 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 31 | 1 | 31 | 39 | 31 | 31 | 31 | 31 | 31 | 33 | 31 | 31 | 128 | 31 | 31 | 42 | 32 | 44 | 46 | 39 |
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.











