
Surf Forecasts:
Number Fours surf forecast from 11 Sep 2026:
- Most powerful swell: Thursday 17 Sep, 8PM (local time) - 7ft (2.2m), 10s period, ENE swell with 862 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 2.2m 10s and forecast to arrive on Thursday (Sep 17) 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 1.6m 6s period and expected on Wednesday (Sep 16) at 11AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Thu 17th Sep) | 7ft (2.2m) 10s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Right folks, Rusty here. Let's have a squiz at what Number Fours has got cookin' over the next couple of weeks.
Overall, we're looking at a pretty drawn-out run of small, messy, and frankly frustrating surf for Number Fours. There's a lot of waiting ahead. The first week and a half is dominated by onshore-ish cross-off winds and mostly knee-to-waist high slop. It's not gonna get you excited.
The water's sitting at 81°, which is pretty much bang on average for this time of year, so no surprises there.
We've got a long gap at the start. The first few days, from Friday the 11th of September through to at least the middle of the following week, are all poor to marginal. The energy is weak to moderate at best, and the wind is a persistent cross-off from the ENE, not the ideal SSE direction this reef needs. The swell is tiny and mixed up.
The first real chance of a pulse arrives mid-week. On Thursday the 17th of September morning, the swell jumps to 7ft from the ENE, but the period is a short, wonky 8 seconds. The combined energy shoots up into the strong zone, but that short period will mean lumpy, sectiony waves. It's a step up in size, but the quality isn't there. The wind remains a tricky cross-off. By Thursday afternoon it's still 7ft, but with a 10-second period. It's bigger, but you're fighting the wind.
The real standout, the one you've been waiting for, is Friday the 25th of September. The morning session is the absolute pick of the whole forecast. We get a solid 7ft of east swell, with a clean 10-second period, delivering nice moderate energy. The wind goes light and cross-off from the east, which for a SSE-facing reef like Number Fours (exposed) means clean, groomed faces. This is proper overhead, with decent shape. It's rated for experienced surfers and it'll be a legit, rippable wave. The only bummer is this spot can get crowded, so expect some company in the water for that one.
After that, it fades back down. Saturday the 26th is still rideable at 6ft with cleaner winds, but the magic of the 25th morning is gone.
So, to boil it down: don't bother for the first week. The light at the end of the tunnel is the morning of Friday the 25th of September. That's your window. Set the alarm.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Fri morning, min 24°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Tue afternoon, min 25°C on Mon morning). Winds increasing (light winds from the NE on Mon night, fresh winds from the ENE by Wed morning). | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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) | ENE 11 | ENE 11 | ENE 10 | SW 15 | ENE 10 | ENE 9 | SW 15 | SSW 15 | SW 12 | SW 23 | SW 22 | SW 21 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | ENE 8 | ENE 10 | ENE 9 |
Wave Graph | |||||||||||||||||||||
387 | 249 | 245 | 242 | 125 | 84 | 107 | 84 | 38 | 86 | 227 | 224 | 392 | 384 | 470 | 455 | 541 | 429 | 629 | 788 | 675 | |
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 | 4:12PM0.57m | 4:51AM0.54m | 4:42PM0.50m | 5:31AM0.57m | 5:11PM0.43m | 6:14AM0.58m | 5:40PM0.36m | 7:02AM0.58m | 6:07PM0.30m | 7:59AM0.57m | 6:32PM0.25m | 9:10AM0.56m | 7:25PM0.21m | ||||||||
Low Tide | 10:02AM0.10m | 10:33PM0.04m | 10:52AM0.13m | 10:56PM0.05m | 11:45AM0.17m | 11:19PM0.06m | 12:45PM0.20m | 11:42PM0.08m | 2:03PM0.23m | 00:07AM0.11m | 4:06PM0.24m | 00:38AM0.13m | 7:14PM0.21m | 1:26AM0.16m | |||||||
6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | |
— | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 |
Feels °C | 25 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 24 | 24 | 24 | 27 | 27 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | ENE 11 | ENE 11 | ENE 10 | SW 15 | ENE 10 | NNE 9 | NNE 9 | NNE 9 | NE 9 | NE 8 | NE 8 | NNE 8 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | SW 16 | SW 16 | SSW 18 |
387 | 249 | 245 | 242 | 125 | 99 | 99 | 99 | 79 | 74 | 69 | 44 | 392 | 384 | 470 | 455 | 541 | 429 | 258 | 258 | 644 | |
Swell 2 Height (m) Direction Period (s) | SW 16 | SW 15 | SW 15 | NE 8 | NE 9 | ENE 9 | SW 15 | SSW 15 | SW 12 | SW 14 | SW 22 | SW 21 | NNE 8 | E 12 | E 11 | SW 12 | SW 11 | E 10 | SSW 20 | SSW 19 | SSE 10 |
261 | 229 | 226 | 74 | 81 | 84 | 107 | 84 | 38 | 49 | 227 | 224 | 50 | 67 | 58 | 35 | 31 | 72 | 149 | 210 | 9 | |
Swell 3 Height (m) Direction Period (s) | NNE 8 | NNE 8 | SSW 11 | SW 8 | SW 16 | SSW 13 | ENE 9 | ENE 9 | ENE 8 | SW 23 | SW 14 | SSW 13 | E 12 | SW 12 | SW 12 | WSW 8 | WSW 10 | SSW 11 | SSW 11 | SSE 10 | W 10 |
26 | 39 | 24 | 11 | 124 | 68 | 26 | 25 | 14 | 86 | 49 | 68 | 47 | 38 | 38 | 6 | 9 | 12 | 11 | 10 | 7 | |
Wind waves Height (m) Direction Period (s) | — | — | — | ENE 10 | — | — | E 5 | ENE 5 | ENE 4 | ENE 5 | ENE 5 | NE 5 | E 6 | NE 8 | ENE 7 | ENE 6 | ENE 7 | ENE 8 | ENE 8 | ENE 10 | ENE 9 |
— | — | — | 160 | — | — | 25 | 17 | 15 | 39 | 24 | 11 | 33 | 99 | 142 | 165 | 249 | 358 | 629 | 788 | 675 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 1 | 1 | 31 | 1 | 1 | 31 | 1 | 13 | 1 | 31 | 1 | 1 | 31 | 31 | 39 | 126 | 31 | 39 | 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.










