
Surf Forecasts:
Number Fours surf forecast from 9 Aug 2026:
- Most powerful swell: Saturday 15 Aug, 8PM (local time) - 13ft (4.0m), 9s period, ENE swell with 2,601 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 Saturday (Aug 15) 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 1.1m 7s period and expected on Sunday (Aug 09) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 8PM (Sat 15th Aug) | 13ft (4.0m) 9s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright, Rusty here, let's have a look at what's coming down the track for Number Fours.
Alright, I've gotta be straight with you. We've got a bit of a flat patch to kick things off, so don't rush to wax your board just yet. The first solid session on offer isn't until Saturday, the 9th of August, and even then it's a marginal call with a cross-off wind. The water temperature is sitting at a pretty warm 81°, which is about average for this time of year, so you won't need a thick suit.
Now, the whole 16-day window is dominated by Easterly and ENE swells. While the wave period is pretty short, mostly around 7 to 8 seconds, the combined swell energy (moderate to strong values, hitting 510 to 2762) shows there's plenty of water moving, but the quality is gonna be the issue. We're looking at a lot of "marginal" and "poor" conditions with that constant fresh breeze keeping things a bit bumpy.
The only real standout in this whole outlook, and I mean the *only* one that gets my heart beating a little faster, is Thursday, the 14th of August. We've got a solid, clean 4ft swell from the South with a very long period of 16 seconds (1088), and while the wind is a cross-off from the ENE, it's clean. That long period groundswell will love Number Fours' reef setup, wrapping in nicely. Expect proper, powerful lines with some decent gaps between sets.
But look, it's a tease. The days after just build into much bigger, nastier surf. By Saturday the 15th, we're looking at a beefy 12ft swell from the ENE. That's expert-only territory, especially with a period of just 9 seconds. It's going to be a heavy, messy, washing-machine situation. Then Sunday the 16th is a write-off with a near-gale and heavy rain – not even worth looking at the ocean.
After that storm passes, Monday the 17th and Tuesday the 18th settle down a bit with 6ft to 6ft ENE swells, but the wind is still onshore or cross-off with moderate to fresh breeze. It's paddleable, but nothing to write home about. There's a long gap of poor and marginal surf with short period windswell from the 19th of August all the way through to the 23rd of August.
Honestly, there's one day to get hyped for: the 14th of August. Otherwise, this is a period for taking it easy and waiting for better. This spot is fairly consistent, so it tends not to stay poor for long.
- Rusty
Short Range ForecastMostly dry. Warm (max 27°C on Sun afternoon, min 25°C on Sat night). Mainly fresh winds. | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Thu morning, min 25°C on Tue night). Mainly strong winds. | |||||||||||||||||||
Sat 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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 18 | SW 18 | ENE 7 | ENE 8 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | SSW 14 | S 20 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | ENE 8 | ENE 8 | E 8 |
Wave Graph | ||||||||||||||||||||
154 | 150 | 225 | 288 | 278 | 251 | 259 | 208 | 208 | 269 | 276 | 509 | 498 | 890 | 734 | 662 | 537 | 675 | 960 | 1379 | |
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 | 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 | 5:17AM0.40m | 5:22PM0.62m | ||||||||
Low Tide | 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 | 10:49AM0.08m | 00:03AM0.04m | |||||||
— | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:07 | — | — | 6:09 | — | — | 6:09 | — | — | |
7:06 | — | — | 7:05 | — | — | 7:05 | — | — | 7:04 | — | — | 7:02 | — | — | 7:02 | — | — | 7:01 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 26 | 27 | 26 | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 26 | 27 | 27 | 26 | 26 | 26 | 26 |
Feels °C | 23 | 23 | 24 | 25 | 26 | 26 | 25 | 25 | 25 | 24 | 22 | 24 | 23 | 24 | 24 | 24 | 24 | 22 | 22 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 13 | E 7 | SSW 17 | SSW 12 | SSW 16 | SSW 15 | SSW 16 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | S 18 | S 18 | S 16 | S 16 | S 15 | S 15 | S 14 | S 14 | S 14 |
101 | 89 | 159 | 86 | 223 | 184 | 191 | 186 | 165 | 269 | 243 | 509 | 498 | 890 | 734 | 662 | 537 | 411 | 333 | 239 | |
Swell 2 Height (m) Direction Period (s) | 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 | E 13 | W 12 | W 11 |
154 | 99 | 96 | 102 | 56 | 56 | 49 | 23 | 40 | 16 | 276 | 222 | 218 | 11 | 11 | 11 | 10 | 31 | 11 | 9 | |
Swell 3 Height (m) Direction Period (s) | SSE 10 | SW 18 | SSE 10 | SSW 18 | W 11 | SSE 10 | SSE 10 | SSE 9 | SSE 9 | S 21 | SSE 8 | W 13 | W 12 | S 20 | SE 10 | SW 19 | SW 18 | W 12 | SSW 18 | SSE 15 |
19 | 150 | 19 | 102 | 20 | 19 | 18 | 17 | 16 | 79 | 7 | 30 | 25 | 8 | 4 | 14 | 13 | 11 | 30 | 22 | |
Wind waves Height (m) Direction Period (s) | ENE 6 | NE 7 | ENE 7 | ENE 8 | ENE 7 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 6 | ENE 6 | ENE 6 | E 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 | E 8 |
146 | 100 | 225 | 288 | 278 | 251 | 259 | 208 | 208 | 188 | 194 | 165 | 188 | 335 | 350 | 360 | 345 | 675 | 960 | 1379 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 39 | 31 | 31 | 39 | 31 | 31 | 31 | 31 | 31 | 32 | 31 | 31 | 39 | 31 | 39 | 44 | 31 | 44 | 127 | 44 |
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.











