
Surf Forecasts:
Number Fours surf forecast from 31 Jul 2026:
- Best quality surf: Wednesday 5 Aug, 5AM (local time) - 4.5ft (1.4m), 10s period, ENE swell with cross-offshore winds.
- Most powerful swell: Saturday 1 Aug, 8AM (local time) - 10ft (3.0m), 8s period, E swell with 1,220 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 5AM (local time) - 4.5ft (1.4m), 10s 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 Wednesday (Aug 05) at 5AM. The primary swell is predicted to be 1.4m and 10s period with a secondary swell of 0.4m and 11s. 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 8s and forecast to arrive on Saturday (Aug 01) at 8AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Wednesday (Aug 05) at 5PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5AM (Wed 5th Aug) | 4.5ft (1.4m) 10s |
| Best Surf | 5AM (Wed 5th Aug) | 4.5ft (1.4m) 10s |
| Most Powerful | 8AM (Sat 1st Aug) | 10ft (3.0m) 8s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down what Number Fours is doing for the next couple of weeks.
The action starts on Thursday, 30th July with a tiny, clean little south-southwest groundswell. At 2 ft from the SSW with a very long 18-second period, this is a proper groundswell – the kind that wraps around and finds the reef. The energy is moderate (559). The water temp is sitting at 80°F which is about normal for the time of year. The wind is a light cross-shore, so it’s glassy enough, but the swell is small. It’s a marginal call, but for a patient surfer on a longboard, it’s a fun little session.
Then we hit a long, long stretch of strong wind. From Friday, 31st July all the way through to the morning of Tuesday, 4th August, the wind is blowing a solid 25 mph from the ENE – that’s cross-offshore, which keeps the surface clean, but the swell jumps up fast. By Saturday morning, 1st August we’ve got 10 ft of short-period E windswell (8 seconds). That’s a lot of raw energy (1578), but it’s messy and powerful – only for the experienced crew. The wave comment flags it as marginal or poor. For the average punter, this is a week to stay on the beach or watch the kite surfers rip. The combined energy is strong.
Tuesday, 4th August brings a slight shift. The morning shows 5 ft from the ENE with a longer 12-second period, and the wind drops to a gentle 9 mph. The energy is moderate (706). This is the best bet in the whole window. The swell is still on the bigger side for beginners, but the clean conditions and longer period should make for some better-shaped waves on the reef. Later in the day, the swell drops to 5 ft with an 11-second period – still a solid option.
After that, the wind stays up but the swell drops off. From Wednesday, 5th August through to Monday, 10th August, we’re looking at mostly 2 ft to 6 ft of short-period windswell, with the wind remaining cross-off but strong. The energy is moderate to weak. Nothing really stands out.
Then on Monday, 10th August, a new SSW groundswell pushes in with a 16-second period and 3 ft of height. The energy is strong (1158), but the wind is still cross-off and the surf is called marginal. It’s a taste of what could be on offer, but it’s a bit of a tease.
From Tuesday, 11th August onward, it’s a slow fade. The swell drops to 2 ft - 3 ft with very short periods (6 seconds) and weak energy. The wind is cross-off, but the surf is flat and poor. Nothing to get excited about.
The standout: Tuesday, 4th August morning. 5 ft of ENE groundswell, gentle wind, and a long period (12s) – that’s the cleanest, most promising window in this 16-day stretch. The crowds are listed as "sometimes", so you might not have the place to yourself, but it’s worth the paddle.
Overall, it’s a mixed bag. The first week is either too windy or too big, then we get a couple of days of decent, surfable waves, then it fades out. If you’ve got a flexible schedule, point your board at Number Fours on the 4th.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Thu afternoon, min 25°C on Thu night). Winds increasing (moderate winds from the ENE on Thu night, strong winds from the ENE by Fri night). | Days 5-7 Weather SummaryMostly dry. Warm (max 27°C on Wed morning, min 25°C on Sun afternoon). Winds decreasing (fresh winds from the ENE on Sun afternoon, light winds from the ENE by Tue night). | |||||||||||||||||||
Thu 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | ||||||||||||||
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) | SSW 18 | ENE 7 | E 8 | ENE 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 12 | ENE 12 | ENE 11 | ENE 10 | ENE 9 | ENE 9 | ENE 8 |
Wave Graph | ||||||||||||||||||||
207 | 220 | 329 | 469 | 1015 | 1142 | 939 | 1098 | 844 | 782 | 554 | 394 | 339 | 824 | 648 | 505 | 373 | 266 | 92 | 147 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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 | cross-off | cross-off |
High Tide | 4:58PM0.68m | 5:11AM0.31m | 5:26PM0.64m | 5:57AM0.34m | 5:55PM0.59m | 6:49AM0.38m | 6:24PM0.52m | 7:47AM0.42m | 6:55PM0.44m | 8:56AM0.47m | 7:27PM0.36m | 10:11AM0.53m | 8:07PM0.29m | |||||||
Low Tide | 11:58PM0.07m | 10:29AM0.06m | 00:22AM0.06m | 11:14AM0.11m | 00:48AM0.05m | 12:06PM0.16m | 1:15AM0.04m | 1:14PM0.22m | 1:46AM0.04m | 2:52PM0.27m | 2:23AM0.03m | 5:19PM0.27m | 3:10AM0.03m | |||||||
— | — | 6:03 | — | — | 6:03 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | |
7:10 | — | — | 7:09 | — | — | 7:09 | — | — | 7:08 | — | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 27 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 26 | 26 | 27 | 27 | 26 |
Feels °C | 27 | 27 | 23 | 22 | 22 | 20 | 20 | 21 | 22 | 22 | 22 | 24 | 24 | 22 | 27 | 26 | 27 | 29 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 8 | S 13 | S 12 | E 16 | E 15 | E 15 | E 14 | E 14 | E 14 | E 14 | E 13 | E 13 | E 13 | ENE 12 | ENE 12 | ENE 11 | ENE 10 | ENE 9 | ENE 9 | ENE 8 |
181 | 166 | 153 | 301 | 267 | 267 | 257 | 194 | 188 | 142 | 125 | 119 | 163 | 824 | 648 | 505 | 373 | 266 | 92 | 147 | |
Swell 2 Height (m) Direction Period (s) | S 13 | SSW 16 | E 15 | SW 15 | SW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 15 | SW 14 |
171 | 177 | 159 | 239 | 220 | 127 | 123 | 131 | 133 | 67 | 57 | 32 | 32 | 48 | 46 | 45 | 41 | 40 | 88 | 53 | |
Swell 3 Height (m) Direction Period (s) | SSW 18 | E 16 | SW 16 | S 12 | SSW 12 | S 12 | S 11 | S 11 | N 9 | N 9 | SW 13 | SW 13 | SW 12 | SSE 9 | SSE 8 | SSE 14 | SW 15 | SW 16 | SSW 11 | S 12 |
207 | 127 | 206 | 106 | 47 | 42 | 39 | 22 | 16 | 13 | 42 | 42 | 38 | 16 | 12 | 63 | 57 | 61 | 39 | 45 | |
Wind waves Height (m) Direction Period (s) | — | ENE 7 | E 8 | ENE 8 | E 8 | E 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | ENE 8 | — | — | — | SE 6 | E 5 | ENE 6 |
— | 220 | 329 | 469 | 1015 | 1142 | 939 | 1098 | 844 | 782 | 554 | 394 | 339 | 370 | — | — | — | 33 | 58 | 54 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 39 | 1 | 39 | 46 | 127 | 130 | 126 | 128 | 46 | 42 | 34 | 39 | 34 | 1 | 7 | 1 | 1 | 1 | 1 | 1 |
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.











