
Surf Forecasts:
Number Fours surf forecast from 15 Jul 2026:
- Best quality surf: Wednesday 15 Jul, 2AM (local time) - 2.5ft (0.7m), 13s period, SW swell with cross-offshore winds.
- Most powerful swell: Sunday 19 Jul, 5AM (local time) - 6ft (1.9m), 8s period, ENE swell with 395 kJ wave energy.
- Next surfable swell (1★+): Wednesday 15 Jul, 2AM (local time) - 2.5ft (0.7m), 13s period with SW 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 Wednesday (Jul 15) at 2AM. The primary swell is predicted to be 0.7m and 13s period with a secondary swell of 0.7m and 7s. 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 1.9m 8s and forecast to arrive on Sunday (Jul 19) at 5AM. 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 Wednesday (Jul 15) at 5AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Wed 15th Jul) | 2.5ft (0.7m) 13s |
| Best Surf | 2AM (Wed 15th Jul) | 2.5ft (0.7m) 13s |
| Most Powerful | 5AM (Sun 19th Jul) | 6ft (1.9m) 8s |
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 cookin’ for Number Fours over the next couple of weeks.
Right off the bat, we’ve got a real slow start. The surf on offer for the first few days is pretty weak and not worth paddling out for. The water temp is sitting at 79°, which is bang on average for the time of year, so no surprises there.
The first real chance to wet a line comes on Saturday, July 19th. The swell bumps up to 5ft from the ENE, but it’s short period stuff at 8 seconds, so it’s not going to have much push. The wind is a fresh cross-offshore breeze, which will keep the surface reasonably clean, but the overall wave quality is still poor. The combined energy is moderate (459), but it’s not really coming together for a proper surf. Sunday, July 20th, is similar with 5ft ENE swell and the same wind, but again, the period is short and the quality is lacking.
We finally get a window of slightly better conditions starting Monday, July 21st, through to Wednesday, July 23rd. Swell sizes stay modest, around 3ft to 3ft, but the period stretches out to 14–16 seconds, which means some longer lines and better shape. The wind is a moderate cross-off from the ENE, so it’s clean. The combined energy picks up into the moderate to strong range (538 to 599). This is about as good as it gets for the first week, but it’s still marginal. The waves will be small and inconsistent, so don’t expect a ripper session.
Now, the standout period for this outlook is the second week, from Thursday, July 24th, right through to the end of the month. The swell jumps into the 7ft range on Saturday, July 26th, from the ENE, with a short period of 7 seconds. That’s a lot of water moving fast, and with the combined energy hitting 916 (strong), this is only for experienced surfers. The wind stays a fresh cross-off, so it’ll be clean, but that size and short period will make for a lumpy, powerful wave. It’s not a beginner-friendly day.
Later in the week, from Monday, July 28th, the swell drops back to 3ft–4ft, but the period is back up to 16 seconds, with a solid combined energy of 821–944 (strong). The wind is a moderate cross-off, so it’s clean. The waves will be small but well-shaped, with long lines. This is your best bet for a fun, manageable session.
The absolute highlight of the whole 16-day window is probably the morning of Monday, July 28th, with 3ft of SSW swell at 16 seconds, combined energy of 821 (strong), and clean conditions. It’s small, but the quality will be there for the patient surfer. Just keep an eye on the tide.
Overall, the first week is a write-off for any decent surf. The second week has some promising windows, especially for those who can handle the bigger, short-period stuff on the 26th, or the cleaner, smaller lines later on. The crowds at Number Fours can be present sometimes, so don’t expect a solitary peak.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Wed morning. Warm (max 26°C on Tue afternoon, min 24°C on Tue night). Winds increasing (light winds from the E on Wed afternoon, fresh winds from the ENE by Fri morning). | Days 5-7 Weather SummaryMostly dry. Warm (max 26°C on Fri afternoon, min 24°C on Fri night). Mainly fresh winds. | ||||||||||||||||||||
Tue 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map | |||||||||||||||||||||
Wave Height (m) Direction Period (s) | SSW 14 | SW 13 | SW 13 | SW 14 | SSW 16 | ENE 6 | SSW 17 | SSW 14 | SW 16 | SSW 16 | ENE 7 | S 13 | E 7 | E 7 | ENE 8 | ENE 8 | ENE 8 | S 16 | S 16 | S 15 | S 14 |
Wave Graph | |||||||||||||||||||||
232 | 170 | 162 | 203 | 314 | 56 | 195 | 183 | 125 | 196 | 165 | 130 | 158 | 387 | 306 | 250 | 201 | 329 | 321 | 271 | 329 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross | 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 | 4:39PM0.80m | 4:45AM0.22m | 5:20PM0.76m | 5:41AM0.26m | 5:59PM0.69m | 6:41AM0.30m | 6:36PM0.61m | 7:44AM0.34m | 7:11PM0.52m | 8:53AM0.38m | 7:45PM0.43m | 10:04AM0.43m | 8:19PM0.34m | 11:13AM0.49m | |||||||
Low Tide | 11:59PM0.01m | 9:57AM-0.04m | 00:34AM0.01m | 10:49AM0.01m | 1:08AM0.01m | 11:44AM0.08m | 1:42AM0.01m | 12:46PM0.16m | 2:15AM0.02m | 2:03PM0.22m | 2:48AM0.03m | 3:52PM0.27m | 3:23AM0.04m | ||||||||
— | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 6:00 | — | — | 6:00 | |
7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | 7:14 | |
mm | — | — | 1 | 1 | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 24 | 25 | 26 | 25 | 26 |
Feels °C | 25 | 25 | 26 | 27 | 25 | 25 | 24 | 24 | 23 | 24 | 23 | 23 | 24 | 23 | 23 | 22 | 22 | 23 | 24 | 23 | 25 |
Swell 1 Height (m) Direction Period (s) | NE 7 | NE 8 | NE 7 | ENE 7 | ENE 7 | ENE 6 | W 14 | SSW 14 | W 14 | SSW 16 | SSW 14 | S 13 | E 7 | SSW 14 | SSW 12 | S 13 | ENE 8 | S 16 | S 16 | ENE 7 | S 14 |
140 | 110 | 122 | 79 | 68 | 56 | 200 | 183 | 144 | 196 | 158 | 130 | 152 | 158 | 87 | 84 | 201 | 329 | 321 | 132 | 329 | |
Swell 2 Height (m) Direction Period (s) | SSW 14 | W 15 | W 15 | W 15 | SSW 16 | W 14 | SSW 17 | W 14 | SW 16 | W 14 | W 13 | NNE 7 | SSW 14 | W 12 | S 19 | S 18 | SSW 12 | NNE 8 | SW 18 | S 15 | SW 17 |
232 | 227 | 221 | 215 | 314 | 203 | 195 | 148 | 125 | 97 | 90 | 26 | 158 | 28 | 66 | 106 | 44 | 22 | 81 | 271 | 73 | |
Swell 3 Height (m) Direction Period (s) | E 8 | SW 13 | SW 13 | SW 14 | W 15 | NNE 7 | SSW 13 | SSE 10 | SSW 12 | SSW 12 | SW 16 | WNW 13 | NNE 7 | S 20 | W 12 | W 12 | S 18 | SW 18 | SSE 6 | SW 16 | SSE 6 |
42 | 170 | 162 | 203 | 212 | 43 | 113 | 19 | 55 | 55 | 62 | 57 | 20 | 32 | 25 | 25 | 97 | 83 | 4 | 69 | 8 | |
Wind waves Height (m) Direction Period (s) | — | E 7 | SE 5 | — | — | — | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 6 | — | E 7 | ENE 8 | ENE 8 | — | ENE 7 | ENE 7 | — | ENE 7 |
— | 53 | 6 | — | — | — | 104 | 132 | 121 | 134 | 165 | 119 | — | 387 | 306 | 250 | — | 140 | 214 | — | 128 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 0 | 4 | 1 | 13 | 31 | 31 | 31 | 31 | 39 | 31 | 33 | 31 | 31 | 31 | 31 | 1 | 31 | 31 | 1 | 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.











