
Surf Forecasts:
Number Fours surf forecast from 21 Jul 2026:
- Best quality surf: Tuesday 21 Jul, 8AM (local time) - 2.5ft (0.8m), 15s period, S swell with cross-offshore winds.
- Most powerful swell: Monday 27 Jul, 2PM (local time) - 6.5ft (2.0m), 14s period, E swell with 1,653 kJ wave energy.
- Next surfable swell (1★+): Tuesday 21 Jul, 8AM (local time) - 2.5ft (0.8m), 15s period with S 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 Tuesday (Jul 21) at 8AM. The primary swell is predicted to be 0.8m and 15s period with a secondary swell of 1.2m and 7s. Another secondary swell of 0.9m and 7s 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 2.0m 14s and forecast to arrive on Monday (Jul 27) 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 (Jul 22) at 11PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Tue 21st Jul) | 2.5ft (0.8m) 15s |
| Best Surf | 8AM (Tue 21st Jul) | 2.5ft (0.8m) 15s |
| Most Powerful | 2PM (Mon 27th Jul) | 6.5ft (2.0m) 14s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down what's coming up for Number Fours.
The start of this run is a bit of a dud. Don't expect much for the first week. We're looking at a long wait for the end of the month when things finally start to line up. The water's at 80°, which is pretty normal for this time of year, so no need for a thick wetsuit.
The first week is a real struggle. Monday the 20th kicks off with a weak 3ft S swell. It's got a long 16 second period, which is nice, but a fresh 19 mph cross-off wind from the ENE is ripping across the face. The energy is a weak 595, so it's not moving much.
Tuesday the 21st is more of the same. A 3ft S swell with a 14-second period, but the wind is still a moderate to fresh cross-off. The energy is a bit better at 533 (morning) and 553 (afternoon), but the scores are still low. It's going to be a frustrating session.
Wednesday the 22nd gets weird. The morning brings a 5ft ENE windswell with a short 7-second period. A total no-go. The afternoon swaps to a 2ft SSW swell with a massive 23-second period, pushing the energy to 799. That's a long period groundswell, but it's tiny and the wind is still a fresh cross-off. It's a tease.
Thursday the 23rd and Friday the 24th are a real grind. The swell is small, around 2ft, from the SSW with a long period, but the wind is a fresh 22 mph cross-off. The energy is moderate (around 900-1000), but the conditions are just poor. The Friday afternoon gets a spike with a 7ft ENE windswell (7-second period) and a strong energy of 1129, but it's a short period, bumpy mess with a strong breeze.
Saturday the 25th and Sunday the 26th are still marginal. The swell starts to build from the east on Sunday, hitting 5ft on the morning of the 26th and 6ft in the afternoon. The period is a solid 16 seconds, so that's a proper groundswell. The energy jumps to 2208 and 2255, which is strong. But that wind is still a fresh 19 mph cross-off. It's a battle, but the swell is there.
Now, here's where it gets good. Monday the 28th of July is the first real standout. The morning brings a 7ft E swell with a 13-second period, and the wind drops to a gentle 9 mph cross-off from the ENE. That's a huge improvement. The energy is a solid 1663. The afternoon is even better: 8ft from the ENE with a 13-second period, and the wind is a light 9 mph from the NE. The combined energy hits 2184. This is the best window so far.
But the real winner is the morning of Tuesday the 29th of July. It's got a 8ft ENE swell, a 13-second period, and the wind is a light 6 mph from the ENE. The forecast calls it "excellent surf conditions for experienced surfers," and I can see why. The energy is a massive 2000. The only thing is, at 8ft, it's getting big. This is for the experienced crew. The crowds are "sometimes" an issue here, so you might have some company, but for that quality, it's worth it. The afternoon of the 29th holds up at 8ft, but the wind picks up a bit to a gentle breeze, so the morning is the pick.
After that, things drop off again. The 30th of July sees the swell collapse back to 2ft, and the rest of the run into early August is a mix of small, short-period windswell or bigger, blown-out windswell. The 1st and 2nd of August have some 6ft to 6ft ENE windswell, but it's only 8 seconds and the wind is a fresh 19-22 mph. That's more of a kite-surfing setup than a clean paddle session.
So, to wrap it up: be patient. The first week and a half is a lot of wind and no real quality. The standout is definitely the morning of Tuesday the 29th of July. That's the one to circle on the calendar. It's a powerful, long-period groundswell with light winds. If you're an intermediate, stick to the Monday the 28th when it's a touch smaller. After that, the window closes again.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Mon night. Warm (max 27°C on Tue afternoon, min 24°C on Tue night). Winds increasing (light winds from the ENE on Tue morning, fresh winds from the ENE by Thu morning). | Days 5-7 Weather SummarySome drizzle, heaviest during Fri morning. Warm (max 26°C on Fri afternoon, min 24°C on Thu night). Mainly strong winds. | |||||||||||||||||||
Mon 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sunday 26 | ||||||||||||||
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) | S 16 | S 15 | S 14 | S 14 | S 13 | ENE 7 | SSW 23 | SSW 22 | ENE 7 | ENE 7 | SSW 18 | SSW 18 | ENE 7 | ENE 8 | ENE 8 | SSW 18 | E 17 | E 16 | E 16 | E 16 |
Wave Graph | ||||||||||||||||||||
321 | 339 | 329 | 311 | 277 | 171 | 426 | 363 | 412 | 395 | 532 | 329 | 456 | 495 | 391 | 572 | 992 | 1301 | 1451 | 1566 | |
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 | 8:19PM0.34m | 11:13AM0.49m | 8:56PM0.27m | 12:12PM0.54m | 10:06PM0.22m | 1:02PM0.59m | 11:46PM0.19m | 1:44PM0.62m | 00:59AM0.18m | 2:22PM0.66m | 1:51AM0.19m | 2:56PM0.68m | 2:32AM0.21m | |||||||
Low Tide | 3:52PM0.27m | 3:23AM0.04m | 6:20PM0.26m | 4:02AM0.05m | 8:25PM0.21m | 9:13PM0.17m | 5:34AM0.05m | 9:41PM0.14m | 6:23AM0.04m | 10:05PM0.12m | 7:08AM0.02m | 10:27PM0.11m | ||||||||
— | — | 6:00 | — | — | 6:00 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | 6:01 | — | — | |
7:15 | — | — | 7:14 | — | — | 7:14 | — | — | 7:14 | — | — | 7:13 | — | — | 7:13 | — | — | 7:13 | — | |
mm | — | 1 | 1 | — | 3 | — | — | — | 1 | — | — | 1 | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 26 | 27 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 26 | 25 | 24 | 25 | 25 | 25 | 25 | 24 |
Feels °C | 23 | 24 | 26 | 25 | 25 | 22 | 22 | 24 | 21 | 21 | 22 | 21 | 23 | 22 | 21 | 23 | 23 | 22 | 21 | 22 |
Swell 1 Height (m) Direction Period (s) | S 16 | ENE 7 | ENE 7 | S 14 | S 13 | E 12 | E 11 | E 12 | SSW 20 | SSW 20 | SSW 18 | SSW 18 | SSW 17 | SSW 16 | SSW 19 | SSW 18 | E 17 | E 16 | E 16 | E 16 |
321 | 158 | 132 | 311 | 277 | 138 | 123 | 180 | 412 | 395 | 464 | 329 | 340 | 232 | 391 | 572 | 992 | 1301 | 1451 | 1566 | |
Swell 2 Height (m) Direction Period (s) | SW 18 | S 15 | S 14 | SW 16 | E 13 | S 13 | SSW 23 | S 13 | S 12 | S 11 | S 13 | S 12 | S 12 | S 20 | SSW 16 | E 14 | NNE 9 | SSW 16 | SSW 16 | SSW 16 |
81 | 339 | 329 | 67 | 121 | 128 | 426 | 157 | 97 | 93 | 85 | 143 | 102 | 296 | 223 | 102 | 144 | 469 | 427 | 416 | |
Swell 3 Height (m) Direction Period (s) | W 12 | SW 16 | SW 17 | E 11 | SW 15 | S 11 | S 13 | SSW 22 | SSW 16 | SW 16 | S 11 | SSW 16 | S 21 | S 12 | E 14 | E 18 | SSW 18 | S 11 | SE 12 | SE 12 |
11 | 69 | 72 | 39 | 60 | 58 | 125 | 363 | 99 | 127 | 56 | 94 | 231 | 100 | 148 | 154 | 547 | 35 | 5 | 6 | |
Wind waves Height (m) Direction Period (s) | ENE 7 | — | — | ENE 7 | 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 8 | ENE 8 | ENE 8 | ENE 7 |
193 | — | — | 136 | 158 | 171 | 125 | 240 | 350 | 339 | 532 | 281 | 456 | 495 | 336 | 402 | 291 | 403 | 372 | 297 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 34 | 1 | 1 | 31 | 31 | 31 | 31 | 33 | 39 | 39 | 31 | 39 | 126 | 31 | 31 | 126 | 31 | 31 | 39 | 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.










