
Surf Forecasts:
Number Fours surf forecast from 13 Jul 2026:
- Best quality surf: Wednesday 15 Jul, 5AM (local time) - 2.5ft (0.7m), 17s period, SSW swell with cross-offshore winds.
- Most powerful swell: Monday 13 Jul, 5AM (local time) - 7ft (2.1m), 8s period, ENE swell with 481 kJ wave energy.
- Next surfable swell (1★+): Wednesday 15 Jul, 2AM (local time) - 2ft (0.6m), 13s 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 Wednesday (Jul 15) at 2AM. The primary swell is predicted to be 0.6m and 13s period. 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 8s and forecast to arrive on Monday (Jul 13) 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 1.4m 8s period and expected on Wednesday (Jul 15) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Wed 15th Jul) | 2ft (0.6m) 13s |
| Best Surf | 5AM (Wed 15th Jul) | 2.5ft (0.7m) 17s |
| Most Powerful | 5AM (Mon 13th Jul) | 7ft (2.1m) 8s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
Alright folks, Rusty here. Let’s have a look at what’s on the cards for Number Fours.
First thing you need to know, there’s nothing worth paddling out for right now. The whole 16-day window is a tough one. We’re looking at a solid stretch of poor to marginal conditions with not a single standout day. The water temperature is sitting at 79°, which is bang on average for this time of year, so nothing unusual there.
The pattern is dominated by a persistent cross-off wind from the ENE, often blowing at 18 to 22 mph, which is a fresh breeze. That wind direction is actually the offshore direction for this spot, so it’s not all bad news for the surface texture, but the swell is coming from the wrong direction almost the entire time. The optimum swell direction for Number Fours is SSE, but we are stuck with constant ENE windswell for the first week and a half. That swell is short period, mostly 7 to 8 seconds, meaning weak, lumpy lines that won’t hold up well on this reef.
There is a glimmer of something different from the 14th of July, where a small SW groundswell of 2 ft slips in with a 14-second period, but with only 260 to 285 combined energy, it’s weak and marginal. The wind is still a moderate cross-off from the ENE, so it’s not ideal. The 15th of July has a similar story, with a tiny 2 ft SSW swell at 14 seconds, but the energy is still low at 262.
The second week, from roughly the 21st of July onward, we start to see some longer-period signals from the S and SSE, with periods up to 15 to 18 seconds. That’s a proper groundswell, but the heights are tiny, only 2 ft to 4 ft. The real issue is that persistent ENE wind, which is still blowing 15 to 18 mph, cross-off. It’s clean, but the swell is just too small and too weak to get excited about. The combined energy does pick up a bit, with values in the 400 to 800 range, so moderate energy, but it’s never matched with the right size or direction.
The best the whole 16 days can offer is a couple of sessions on the 27th of July. Monday morning shows a 4 ft E swell with a 15-second period, combined energy of 1168, which is the strongest of the whole period. The wind eases to a moderate 15 mph cross-off from the ENE. That’s the most promising window, but it’s still cross-off, not truly offshore, and the swell direction is ENE, not the preferred SSE. It’s marginal, but it’s the best of a bad bunch. Monday afternoon sees a similar setup with a 4 ft E swell at 15 seconds, wind shifting to NE at 12 mph, making for a slightly cleaner look. Still, don’t expect the world. This is a classic case of a long-range forecast looking a little better, but it’s still far from a sure thing.
Honestly, this is a tough run. The reef at Number Fours needs the right combination of SSE swell and light offshore winds, and we’re just not getting it. If you’re desperate for a paddle, the 27th of July is your best bet, but keep expectations low. For now, it’s a waiting game.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue morning. Warm (max 26°C on Wed morning, min 24°C on Sun night). Winds decreasing (strong winds from the ENE on Sun afternoon, light winds from the ENE by Tue night). | Days 5-7 Weather SummaryLight rain (total 2mm), mostly falling on Wed night. Warm (max 26°C on Wed afternoon, min 24°C on Thu night). Winds increasing (light winds from the E on Wed night, fresh winds from the ENE by Thu night). | ||||||||||||||||||||
Sun 12 | Monday 13 | Tuesday 14 | Wednesday 15 | Thursday 16 | Friday 17 | Saturday 18 | |||||||||||||||
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) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | SW 14 | SW 14 | SSW 13 | ENE 7 | SSW 14 | SW 16 | SSW 16 | SSW 17 | SSW 12 | SSW 11 | SSW 16 | S 14 | ENE 8 | ENE 8 | ENE 7 | ENE 7 |
Wave Graph | |||||||||||||||||||||
419 | 451 | 358 | 296 | 236 | 191 | 186 | 111 | 168 | 178 | 251 | 175 | 195 | 341 | 222 | 196 | 136 | 300 | 345 | 405 | 346 | |
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 | 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 | 3:11PM0.80m | 2:52AM0.17m | 3:56PM0.82m | 3:49AM0.19m | 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 | |||||||
Low Tide | 10:45PM0.04m | 8:13AM-0.09m | 11:23PM0.02m | 9:06AM-0.08m | 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 | ||||||||
— | — | 5:56 | — | — | 5:56 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | — | — | 5:58 | |
7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | — | 7:15 | — | 7:15 | |
mm | — | — | — | — | — | 1 | 1 | 1 | — | — | 2 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 25 | 24 | 25 | 25 | 24 | 25 | 25 | 24 | 26 | 26 | 25 | 26 | 26 | 25 | 25 | 26 | 25 | 26 | 26 | 25 | 25 |
Feels °C | 21 | 21 | 22 | 22 | 22 | 25 | 24 | 23 | 27 | 27 | 24 | 25 | 25 | 25 | 23 | 25 | 25 | 25 | 26 | 24 | 24 |
Swell 1 Height (m) Direction Period (s) | SW 16 | SW 16 | SSW 15 | SSW 15 | SW 14 | NNE 7 | E 8 | NE 7 | ENE 7 | ENE 7 | NE 7 | W 14 | W 14 | SSW 12 | ENE 7 | ENE 6 | NE 7 | SSW 13 | SSW 14 | S 12 | S 12 |
367 | 353 | 287 | 272 | 208 | 105 | 74 | 121 | 168 | 84 | 151 | 203 | 203 | 341 | 154 | 64 | 54 | 141 | 210 | 108 | 72 | |
Swell 2 Height (m) Direction Period (s) | SSE 12 | W 12 | SSE 12 | W 18 | W 18 | E 8 | SW 14 | W 15 | W 15 | W 15 | SW 16 | SSW 16 | SSW 17 | W 14 | SSW 11 | SSW 10 | S 14 | NNE 8 | NNE 8 | W 13 | S 19 |
48 | 26 | 27 | 97 | 152 | 94 | 186 | 227 | 221 | 215 | 251 | 175 | 195 | 148 | 222 | 111 | 136 | 19 | 19 | 28 | 65 | |
Swell 3 Height (m) Direction Period (s) | W 12 | SSE 12 | W 12 | SSE 11 | SW 18 | SW 14 | W 16 | SSW 13 | SSW 13 | SSW 14 | W 15 | NNE 8 | SSE 7 | SSW 18 | W 14 | SSW 16 | SSW 8 | SSW 8 | SW 8 | SSE 9 | SSE 8 |
26 | 28 | 26 | 25 | 82 | 191 | 188 | 111 | 142 | 178 | 212 | 33 | 31 | 103 | 101 | 196 | 41 | 23 | 14 | 15 | 7 | |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 7 | — | NE 7 | NE 8 | — | — | ENE 7 | ENE 6 | ENE 7 | ENE 7 | — | — | E 6 | ENE 8 | ENE 8 | ENE 7 | ENE 7 |
419 | 451 | 358 | 296 | 236 | — | 136 | 204 | — | — | 137 | 127 | 158 | 180 | — | — | 47 | 300 | 345 | 405 | 346 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 42 | 39 | 32 | 31 | 1 | 1 | 2 | 0 | 1 | 31 | 0 | 31 | 39 | 31 | 31 | 4 | 2 | 31 | 31 | 31 | 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.











