
Surf Forecasts:
Number Fours surf forecast from 9 Jul 2026:
- Most powerful swell: Sunday 12 Jul, 8PM (local time) - 8ft (2.4m), 8s period, ENE swell with 654 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 2.4m 8s and forecast to arrive on Sunday (Jul 12) 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 0.7m 15s period and expected on Wednesday (Jul 15) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sun 12th Jul) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
Alright, let’s get into it. This is Rusty, and I’m looking at the outlook for Number Fours.
Alright, straight up, the next week and a half is going to be a grind. To be honest, there’s no real standout window here, but we do have a pulse of better energy pushing in near the end of the forecast period. The whole run is plagued by a persistent cross-offshore wind from the ENE that’s blowing hard, usually 18 to 25 mph. That’s going to keep things choppy and messy, even though the wave faces themselves are clean. It’s a frustrating combo.
We kick off on Wednesday, July 8th, with a 7 ft swell from the ENE, but that 25 mph wind and 7-second period make for poor surf. The combined energy is moderate at 636. The water temp is sitting at 80°, with an anomaly of 0.7°, so it’s about average for this time of year.
The whole first week, from the 8th through to the 18th, the swell hangs around 5 ft to 8 ft, mostly from the ENE, with periods of 7 to 9 seconds. The wind stays relentless—cross-off from the ENE or NE, between 18 and 25 mph. The combined energy fluctuates, with the highest in that window hitting 1511 on the afternoon of the 18th, but even then, the conditions are rated as marginal. For a reef break, this constant wind and short-period swell is going to feel like a washing machine. It’s not going to be fun for paddle surfing; the setup here looks more interesting for a kite session than a traditional surf.
Then, finally, a change. On Tuesday, July 21st, the swell direction swings to the E, and the period jumps way up to 18 seconds. That’s a very long period groundswell. The swell height drops to 2 ft in the morning, building to 3 ft in the afternoon. The wind eases to 15 mph from the NE. The combined energy is still strong, hitting 1012 in the afternoon. This is the best chance we get. That long period means the waves will have more shape and energy, but it might break a bit straight on a reef. It’s still cross-off wind, but lighter. For a spot that’s fairly consistent, this is the one to watch, but it’s a long-range call, so keep your expectations in check.
Wednesday the 22nd offers similar vibes—4 ft to 4 ft swell from the E with a 15-second period, and winds still around 18 mph. The energy is high (1072 in the morning). Not perfect, but a lot more interesting than the earlier junk.
After that, it fades out on the 23rd with a drop to 3 ft and 13-second period, and the wind picks back up to 22 mph. The run ends with poor surf.
So, there’s a big gap of poor to marginal surf for the first 10 days or so, then a blip of promising, long-period groundswell on the 21st and 22nd. That’s our only real chance for a surf. The crowd factor at Number Fours is listed as “sometimes”, so be aware you might have company, but it’s not a circus.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Wed night). Mainly strong winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 25°C on Sat afternoon, min 24°C on Sat night). Mainly strong winds. | ||||||||||||||||||||
Wed 8 | Thursday 9 | Friday 10 | Saturday 11 | Sunday 12 | Monday 13 | Tuesday 14 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
440 | 539 | 393 | 373 | 400 | 379 | 325 | 381 | 444 | 387 | 369 | 456 | 637 | 525 | 393 | 345 | 349 | 280 | 294 | 369 | 432 | |
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 | 10:00PM0.26m | 12:45PM0.61m | 11:18PM0.20m | 1:36PM0.69m | 00:40AM0.17m | 2:24PM0.76m | 1:50AM0.16m | 3:11PM0.80m | 2:52AM0.17m | 3:56PM0.82m | 3:49AM0.19m | 4:39PM0.80m | 4:45AM0.22m | ||||||||
Low Tide | 6:43PM0.23m | 4:48AM-0.04m | 8:17PM0.17m | 5:36AM-0.06m | 9:18PM0.12m | 6:28AM-0.08m | 10:04PM0.07m | 7:21AM-0.09m | 10:45PM0.04m | 8:13AM-0.09m | 11:23PM0.02m | 9:06AM-0.08m | 11:59PM0.01m | 9:57AM-0.04m | |||||||
— | — | 5:54 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:56 | — | — | 5:58 | |
7:16 | — | — | 7:16 | — | — | 7:16 | — | — | 7:16 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | 7:15 | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 24 | 25 | 25 | 24 | 25 | 26 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 25 | 25 |
Feels °C | 21 | 20 | 23 | 22 | 21 | 23 | 24 | 21 | 22 | 22 | 21 | 22 | 21 | 21 | 22 | 21 | 21 | 22 | 22 | 23 | 23 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | S 13 | S 12 | S 12 | S 12 | S 12 | SSW 11 | SW 19 | SSW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SSW 15 | SW 14 | SW 14 | SW 14 | W 15 | W 15 |
187 | 125 | 112 | 110 | 75 | 71 | 42 | 184 | 221 | 316 | 309 | 376 | 367 | 353 | 322 | 272 | 208 | 191 | 186 | 227 | 221 | |
Swell 2 Height (m) Direction Period (s) | SE 8 | W 15 | SSE 8 | W 14 | W 13 | W 13 | SW 21 | S 12 | W 14 | W 13 | W 13 | S 13 | SSE 12 | SSE 12 | SSE 12 | W 18 | W 18 | W 16 | W 16 | SSW 13 | SW 13 |
3 | 17 | 6 | 15 | 13 | 13 | 109 | 42 | 63 | 54 | 54 | 29 | 28 | 28 | 27 | 97 | 150 | 188 | 188 | 111 | 164 | |
Swell 3 Height (m) Direction Period (s) | S 18 | SE 8 | S 16 | SSE 8 | W 16 | SSW 21 | W 13 | W 13 | S 12 | S 12 | S 11 | W 12 | W 12 | W 12 | W 12 | SSE 11 | SW 18 | SSW 19 | SW 19 | SSW 17 | SW 18 |
6 | 3 | 21 | 6 | 20 | 45 | 29 | 55 | 44 | 25 | 22 | 27 | 26 | 26 | 12 | 25 | 82 | 146 | 94 | 197 | 152 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 |
440 | 539 | 393 | 373 | 400 | 379 | 325 | 381 | 444 | 387 | 369 | 456 | 637 | 525 | 393 | 345 | 349 | 280 | 294 | 369 | 432 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 48 | 39 | 39 | 44 | 33 | 31 | 128 | 33 | 32 | 39 | 31 | 39 | 42 | 33 | 39 | 39 | 31 | 32 | 39 | 31 | 33 |
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.











