
Surf Forecasts:
Number Fours surf forecast from 5 Sep 2026:
- Best quality surf: Sunday 6 Sep, 11PM (local time) - 7ft (2.1m), 12s period, ENE swell with cross-offshore winds.
- Most powerful swell: Monday 7 Sep, 11PM (local time) - 10ft (3.0m), 14s period, SW swell with 3,419 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 11PM (local time) - 7ft (2.1m), 12s period with ENE 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 Sunday (Sep 06) at 11PM. The primary swell is predicted to be 2.1m and 12s period with a secondary swell of 1.3m and 14s. 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 3.0m 14s and forecast to arrive on Monday (Sep 07) at 11PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.6m 11s period and expected on Tuesday (Sep 08) at 2PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 6th Sep) | 7ft (2.1m) 12s |
| Best Surf | 11PM (Sun 6th Sep) | 7ft (2.1m) 12s |
| Most Powerful | 11PM (Mon 7th Sep) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get stuck into what’s cooking at Number Fours over the next couple of weeks.
Right off the bat, I gotta be honest with you – this is a tough stretch. The forecast is a real mixed bag of half-decent swell and some pretty nasty winds. The water temp is sitting at 81°, which is bang on average for this time of year, so no surprises there.
The main issue is that almost every day gets tagged as "marginal" or "poor." The first few days this weekend and into next week have some size, but the wind is a big problem. Saturday morning, September 5th, has a 7ft swell from the ENE with a 13-second period, and the combined energy is a hefty 2205, but it's a cross-offshore breeze at 19 mph. That’s a lot of wind on a 7ft face, and it's gonna be a bumpy, blown-out mess. The better option the same day is the afternoon, but it's the same story. Sunday the 6th is a little smaller at 6ft, but the wind is still howling. The chance of thunderstorms doesn’t help the vibe either.
Monday the 7th is a write-off. The morning has a 7ft swell, but the wind is a straight cross, causing a chop. The afternoon is even worse, with a 7ft SW groundswell rolling in from a 14-second period, but the wind swings onshore, and the energy jumps to 3676. That’s a lot of power, but with onshore wind, it’s going to be a washing machine. That’s more of a kite-surfing session than a paddle session.
The mid-week is a total wipeout. Tuesday the 8th has onshore wind and a 8ft swell – that’s expert territory, but with the wind howling on it, it’s just dangerous. Wednesday the 9th drops right off to 3ft, and the cross-offshore wind is back but it’s just too small to do anything with.
Now, if you’re patient, there’s a glimmer of hope in the second week. Around Tuesday the 15th and Wednesday the 16th, the swell picks back up to 7ft from the ENE. The period is short at 8 seconds, so it’s gonna be a bit dumpy and fat, but the wind is a light to moderate cross-offshore at 12-19 mph, and the combined energy is in the moderate range (1067 for the 16th). The sets will be quick and consistent, but it’s a short-period windswell – not the kind of wave that’ll peel down the reef like a dream. It’ll be a bit of a battle, but it’s the best of a bad lot. The crowd factor is "sometimes," so you might have a few others out there, but it won’t be a circus.
The last few days of the forecast, from the 18th to the 20th, drop back down to 3ft SSW groundswell with a long 15-17 second period. That’s a classic Number Fours direction, and the energy is still there (in the 700-900 range), but the size is tiny. For a reef break, a 3ft SSW groundswell with that long period can be a fun little wave if you’re on a log, but it’s not going to get you out of bed.
The Standout: Honestly, there’s no single day that screams "go." The best of the bunch is probably Tuesday the 15th and Wednesday the 16th. The swell is consistent at 7ft from the ENE, the wind is cross-offshore, and it's the most consistent run of the whole forecast. It’s not perfect, but it’s the only window where you’re not fighting the wind or the tide. For a reef, the ENE direction isn’t the optimum (that’s SSE), so it’ll be a bit fat on the takeoff, but it’s ridable.
If you’re a beginner, steer clear of anything over 5ft, and definitely avoid the 8ft day on the 8th. For the experts, the 8ft day on the 8th is a no-go because of the wind.
So, to sum it up: a frustrating start, a quiet middle, and a slightly better but still average second week. It’s not a classic run, but conditions can change. Keep an eye on the wind.
Rusty.
Short Range ForecastHeavy rain (total 22mm), heaviest during Sun night. Warm (max 27°C on Sat afternoon, min 25°C on Sat morning). Mainly fresh winds. | Days 4-6 Weather SummaryLight rain (total 7mm), mostly falling on Tue morning. Warm (max 27°C on Tue morning, min 25°C on Wed night). Mainly fresh winds. | ||||||||||||||||||||
Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | |||||||||||||||
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 13 | ENE 13 | E 13 | ENE 12 | ENE 12 | ENE 12 | ENE 12 | SW 14 | SW 14 | SW 11 | ENE 11 | SSW 14 | SSW 14 | SSW 13 | E 12 | ENE 7 | ENE 7 | ENE 7 | SW 16 | ENE 12 | ENE 7 |
Wave Graph | |||||||||||||||||||||
1496 | 1474 | 1400 | 1100 | 1064 | 1316 | 1428 | 1665 | 3355 | 1487 | 615 | 356 | 273 | 204 | 148 | 197 | 203 | 262 | 261 | 188 | 310 | |
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 | cross-on | cross-on | on | on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 12:05PM0.69m | 00:18AM0.21m | 1:00PM0.73m | 1:21AM0.26m | 1:47PM0.73m | 2:09AM0.32m | 2:28PM0.72m | 2:51AM0.39m | 3:05PM0.69m | 3:32AM0.45m | 3:39PM0.64m | 4:11AM0.50m | 4:12PM0.57m | 4:51AM0.54m | |||||||
Low Tide | 8:03PM0.13m | 5:11AM0.08m | 8:31PM0.10m | 6:25AM0.07m | 8:57PM0.08m | 7:26AM0.06m | 9:22PM0.06m | 8:21AM0.06m | 9:46PM0.05m | 9:12AM0.07m | 10:10PM0.04m | 10:02AM0.10m | 10:33PM0.04m | ||||||||
6:15 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | |
— | 6:43 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | |
mm | — | — | — | — | 1 | 13 | 2 | 4 | 2 | 2 | 2 | 1 | 2 | — | — | — | — | — | — | — | 2 |
Temp °C | 26 | 27 | 26 | 27 | 27 | 25 | 26 | 27 | 27 | 27 | 27 | 27 | 27 | 27 | 26 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 25 | 26 | 26 | 26 | 27 | 26 | 27 | 28 | 27 | 28 | 27 | 30 | 30 | 28 | 26 | 24 | 24 | 23 | 24 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 12 | E 13 | ENE 12 | ENE 12 | ENE 12 | ENE 12 | ENE 12 | SW 14 | SW 11 | ENE 11 | ENE 9 | ENE 8 | ENE 8 | E 12 | E 12 | E 12 | E 12 | ENE 12 | ENE 12 | ENE 7 |
647 | 650 | 1400 | 1100 | 1064 | 1316 | 1428 | 1281 | 3355 | 1487 | 615 | 272 | 169 | 122 | 148 | 141 | 141 | 146 | 192 | 186 | 310 | |
Swell 2 Height (m) Direction Period (s) | SSW 18 | NNE 10 | SSW 12 | SSW 11 | SSW 11 | SSW 14 | SW 13 | SW 14 | ENE 12 | ENE 11 | SSW 9 | SSW 8 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SW 16 | SW 16 | SW 15 | SW 15 |
62 | 19 | 488 | 337 | 280 | 742 | 594 | 1665 | 1066 | 885 | 380 | 149 | 273 | 204 | 133 | 133 | 93 | 211 | 261 | 181 | 226 | |
Swell 3 Height (m) Direction Period (s) | NNE 10 | NNE 10 | SSE 10 | SSW 16 | SSW 19 | SSW 18 | SW 15 | SSW 17 | SSW 15 | SSW 15 | W 10 | SSW 14 | SSW 8 | E 13 | SSW 7 | SSW 16 | SW 18 | SSW 12 | SSW 12 | SSW 12 | SSW 11 |
20 | 19 | 19 | 169 | 283 | 340 | 427 | 618 | 500 | 474 | 392 | 356 | 66 | 161 | 38 | 179 | 154 | 81 | 45 | 44 | 24 | |
Wind waves Height (m) Direction Period (s) | ENE 13 | ENE 13 | — | — | — | — | — | S 7 | — | — | — | — | — | — | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | — |
1496 | 1474 | — | — | — | — | — | 112 | — | — | — | — | — | — | 125 | 197 | 203 | 262 | 208 | 188 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 31 | 1 | 31 | 31 | 0 | 46 | 58 | 46 | 48 | 19 | 16 | 1 | 31 | 31 | 31 | 31 | 2 | 31 | 31 | 1 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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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.










