Surf Forecasts:
Number Fours surf forecast from 14 Sep 2026:
- Best quality surf: Friday 18 Sep, 11PM (local time) - 3.5ft (1.0m), 16s period, SSW swell with cross-offshore winds.
- Most powerful swell: Thursday 17 Sep, 2PM (local time) - 7ft (2.1m), 10s period, ENE swell with 799 kJ wave energy.
- Next surfable swell (1★+): Friday 18 Sep, 11PM (local time) - 3.5ft (1.0m), 16s period with SSW swell.
Best Forecast Surf Conditions for Number Fours this week:
The surf forecast for Number Fours over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 18) at 11PM. The primary swell is predicted to be 1.0m and 16s period with a secondary swell of 0.4m and 6s. Another secondary swell of 1.8m and 8s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Number Fours in the next 16 days are 2.1m 10s and forecast to arrive on Thursday (Sep 17) at 2PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Wednesday (Sep 16) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Fri 18th Sep) | 3.5ft (1.0m) 16s |
| Best Surf | 11PM (Fri 18th Sep) | 3.5ft (1.0m) 16s |
| Most Powerful | 2PM (Thu 17th Sep) | 7ft (2.1m) 10s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a proper look at what Number Fours is serving up over the next couple of weeks.
Right now, it’s looking like a slow burner. We’ve got a bit of a flat patch to start with – nothing really worth paddling out for on Monday the 14th or Tuesday the 15th. The swell is tiny and the energy is just not there, despite the water sitting at a warm 81°, which is pretty normal for this time of year.
We start to see a little life on Wednesday the 16th, with some waist-high SW groundswell pushing in. The combined energy is moderate (827), and those long 18 second periods mean the waves will have some shape, but it’s still very much a marginal call. The wind is cross-off, so it’s clean, but the size isn’t really making anyone’s heart beat faster.
The middle of the week around Thursday the 19th and Friday the 20th gets a bit messy. We see a jump in size to around chest-high, but that swell is short-period windswell from the ENE, and the energy drops off. The wind is pumping from the ENE at 18-22 mph, keeping things clean-ish, but it’s not quality surf. It’s more of a chop-buster session.
The real standout, and the only time I’d really get excited, is that window around Saturday the 26th of September through to Tuesday the 29th. After a run of ordinary stuff, things finally click. We’re looking at clean, glassy conditions with light or even zero wind, and a beautiful long-period SW groundswell rolling in. The size sits around waist-to-chest high (3 ft to 3 ft), but with periods of 14 to 18 seconds, these waves will have proper push and shape. The combined energy is moderate (428 to 875), but the quality will be high. That Saturday morning (26th) with the glassy surface and that SSW swell is a beautiful prospect. The Sunday (27th) morning is also a cracker with calm winds. This is the pick of the whole run – small but absolutely clean and fun. The water temperature anomaly is normal, so no weird thermals to worry about.
After that, things start to fade again into the first few days of October, but for now, mark your calendar for that last weekend in September. It’s not a big swell, but it’s going to be one of those days where every wave feels like it was made for you. Crowds are possible here, so get in early.
Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Mon afternoon, min 25°C on Mon morning). Mainly fresh winds. | Days 4-6 Weather SummaryModerate rain (total 11mm), heaviest on Thu night. Warm (max 27°C on Thu afternoon, min 26°C on Thu morning). Winds increasing (light winds from the ENE on Fri night, fresh winds from the ENE by Sat afternoon). | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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 23 | SW 22 | SW 21 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | ENE 10 | ENE 9 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | ENE 8 | E 7 | ENE 8 | ENE 7 |
Wave Graph  | |||||||||||||||||||||
 kJ | 86 | 227 | 224 | 392 | 384 | 470 | 455 | 541 | 429 | 763 | 630 | 644 | 622 | 580 | 539 | 392 | 402 | 427 | 411 | 345 | 365 |
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 | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 5:40PM0.36m | 7:02AM0.58m | 6:07PM0.30m | 7:59AM0.57m | 6:32PM0.25m | 9:10AM0.56m | 7:25PM0.21m | 10:27AM0.57m | 11:01PM0.21m | 11:34AM0.59m | 00:19AM0.23m | 12:26PM0.61m | 00:59AM0.27m | ||||||||
Low Tide | 12:45PM0.20m | 11:42PM0.08m | 2:03PM0.23m | 00:07AM0.11m | 4:06PM0.24m | 00:38AM0.13m | 7:14PM0.21m | 1:26AM0.16m | 7:23PM0.18m | 2:56AM0.18m | 7:43PM0.16m | 4:35AM0.17m | 8:01PM0.15m | ||||||||
 |  |  | | |  | | | | |  |  | | | | | | |  | | | |
 | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 7 | — | — | 3 | — | — | — | — | — | — |
Temp °C | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 26 |
Feels °C | 25 | 26 | 27 | 28 | 27 | 26 | 27 | 26 | 26 | 26 | 27 | 26 | 25 | 25 | 27 | 27 | 25 | 24 | 24 | 23 | 24 |
Swell 1 Height (m) Direction Period (s) | NE 8 | SW 22 | NE 8 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | SW 16 | SW 16 | SSW 18 | SSW 17 | SSW 17 | SSW 16 | SSW 16 | SSW 16 | SSW 16 | S 15 | SSW 15 | SSW 14 |
| kJ | 58 | 227 | 31 | 392 | 384 | 470 | 455 | 541 | 429 | 258 | 258 | 644 | 622 | 580 | 539 | 382 | 387 | 350 | 233 | 296 | 276 |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 21 | NNE 8 | E 12 | E 11 | SW 12 | SW 11 | E 10 | SSW 20 | SSW 19 | SSE 10 | SSE 10 | SSE 7 | SSE 6 | SSW 18 | SSE 6 | SW 16 | SSW 15 | SW 15 | SW 15 |
| kJ | 49 | 49 | 224 | 24 | 68 | 58 | 35 | 43 | 96 | 149 | 210 | 9 | 9 | 18 | 7 | 108 | 16 | 121 | 146 | 104 | 33 |
Swell 3 Height (m) Direction Period (s) | SW 23 | SSW 11 | SSW 13 | E 12 | SW 12 | SW 12 | S 9 | S 8 | SSW 11 | SW 11 | SSE 10 | WSW 10 | W 9 | W 9 | S 20 | SSE 7 | S 18 | SSW 14 | SSE 7 | W 13 | W 12 |
| kJ | 86 | 12 | 68 | 46 | 38 | 38 | 6 | 5 | 12 | 18 | 10 | 9 | 7 | 6 | 67 | 15 | 99 | 37 | 5 | 13 | 12 |
Wind waves Height (m) Direction Period (s) | NE 5 | NE 8 | NE 5 | ENE 6 | NE 8 | ENE 5 | ENE 10 | ENE 10 | ENE 6 | ENE 10 | ENE 9 | ENE 9 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | E 7 | ENE 8 | ENE 7 |
| kJ | 23 | 149 | 41 | 53 | 96 | 75 | 331 | 427 | 185 | 763 | 630 | 534 | 427 | 438 | 427 | 392 | 402 | 427 | 411 | 345 | 365 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 1 | 1 | 1 | 2 | 2 | 31 | 126 | 31 | 31 | 31 | 1 | 31 | 31 | 1 | 44 | 39 | 31 | 33 | 39 | 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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