Surf Forecasts:
Number Fours surf forecast from 4 Aug 2026:
- Best quality surf: Tuesday 4 Aug, 8AM (local time) - 5ft (1.5m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 4 Aug, 2AM (local time) - 5ft (1.5m), 12s period, ENE swell with 623 kJ wave energy.
- Next surfable swell (1★+): Tuesday 4 Aug, 8AM (local time) - 5ft (1.5m), 11s 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 Tuesday (Aug 04) at 8AM. The primary swell is predicted to be 1.5m and 11s period with a secondary swell of 0.4m and 12s. 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 1.5m 12s and forecast to arrive on Tuesday (Aug 04) at 2AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 6s period and expected on Friday (Aug 07) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Tue 4th Aug) | 5ft (1.5m) 11s |
| Best Surf | 8AM (Tue 4th Aug) | 5ft (1.5m) 11s |
| Most Powerful | 2AM (Tue 4th Aug) | 5ft (1.5m) 12s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
The Lowdown
Alright folks, Rusty here with the same look but in feet and miles per hour.
Number Fours (reef) is looking at a solid run of surf, but the wind’s going to be a factor. The water’s sitting at a warm 81°, which is about average for this time of year.
Monday the 3rd of August kicks off with a 5ft swell from the ENE with a 8 second interval and a cross-off breeze at 16 mph. Combined energy is moderate at 492, but the conditions feel a bit marginal. Tuesday the 4th looks a cleaner with 5ft at 11 seconds and winds dropping to 9 mph – the longer period will give the reef some proper lines.
Wednesday the 5th drops to about 4ft, still okay. Then Thursday and Friday the 6th and 7th are tiny – waist-high, long period S swell but energy drops hard to 166, and with fresh 16-19 mph wind it’s not worth paddling.
From Saturday the 8th we get a bump in size, back to 5-6ft but all short-period (7 seconds) windswell, and the wind is a fresh 22 mph. It’s clean enough for a kite but messy for a board. This pattern holds through the whole second week – consistent 5-8ft of short-period ENE windswell, energy in the 500-900 range, but always that same cross-off wind.
The one true standout hits right at the end. On Tuesday the 18th of August, look at the morning: 7ft ENE at 8 seconds, energy a strong 872, and the wind goes completely calm – dead flat glass. The reef will be handling some size but with zero wind the waves will be peaky and clean. That’s your session.
Watch the size later on – by the 14th through the 16th we’ve got 6-8ft, and over 8ft it’s expert-only. Crowds are "sometimes" a factor, so expect a few locals when it’s clean.
The glassy morning on the 18th is the one.
Rusty.
Short Range ForecastMostly dry. Warm (max 27°C on Mon afternoon, min 25°C on Mon morning). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Thu afternoon. Warm (max 26°C on Thu afternoon, min 25°C on Thu morning). Mainly fresh winds. | ||||||||||||||||||||
Monday 3 | Tuesday 4 | Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | |||||||||||||||
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 8 | ENE 8 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 9 | ENE 9 | SSW 14 | SSW 14 | ENE 8 | SW 21 | SW 20 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 313 | 294 | 623 | 515 | 415 | 473 | 312 | 237 | 176 | 81 | 80 | 102 | 115 | 99 | 181 | 219 | 204 | 289 | 305 | 358 | 310 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | 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 | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:55PM0.44m | 8:56AM0.47m | 7:27PM0.36m | 10:11AM0.53m | 8:07PM0.29m | 11:24AM0.60m | 9:30PM0.22m | 12:27PM0.67m | 11:32PM0.19m | 1:22PM0.73m | 00:59AM0.19m | 2:10PM0.78m | 2:02AM0.22m | ||||||||
Low Tide | 1:14PM0.22m | 1:46AM0.04m | 2:52PM0.27m | 2:23AM0.03m | 5:19PM0.27m | 3:10AM0.03m | 7:39PM0.21m | 4:08AM0.02m | 8:34PM0.16m | 5:14AM0.01m | 9:09PM0.12m | 6:20AM-0.01m | 9:40PM0.08m | ||||||||
 | |  |  | | | | | |  |  | | | | | | | | | | | |
 | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:05 | — | — | 6:07 | — | — | 6:07 | — | — |
 | — | 7:08 | — | — | 7:07 | — | — | 7:07 | — | — | 7:07 | — | — | 7:06 | — | — | 7:06 | — | — | 7:05 | — |
mm | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 26 | 25 | 25 | 26 | 25 | 25 | 25 | 25 | 26 | 26 | 25 | 26 | 26 | 25 |
Feels °C | 25 | 26 | 26 | 27 | 28 | 27 | 26 | 25 | 25 | 25 | 26 | 24 | 23 | 22 | 24 | 23 | 22 | 22 | 24 | 24 | 23 |
Swell 1 Height (m) Direction Period (s) | E 13 | E 12 | ENE 12 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | SSW 15 | ENE 9 | ENE 8 | ENE 8 | SW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 17 | SSW 12 | S 16 |
| kJ | 84 | 108 | 623 | 515 | 415 | 358 | 312 | 88 | 176 | 59 | 43 | 102 | 77 | 73 | 107 | 113 | 101 | 99 | 159 | 86 | 131 |
Swell 2 Height (m) Direction Period (s) | SSW 13 | SSW 12 | SSW 12 | SSW 12 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSE 12 | SSW 14 | SSW 14 | SSE 11 | SSE 11 | SW 20 | SSW 19 | SW 18 | SSW 18 | SW 18 | SSW 13 | SW 16 | SSW 12 |
| kJ | 53 | 50 | 56 | 46 | 51 | 47 | 38 | 39 | 49 | 81 | 80 | 40 | 22 | 99 | 148 | 164 | 124 | 150 | 96 | 66 | 57 |
Swell 3 Height (m) Direction Period (s) | SW 13 | SW 13 | SSE 9 | W 13 | SW 16 | SW 15 | SSE 13 | SSE 12 | SW 14 | SSE 12 | S 11 | NNW 7 | SW 21 | S 11 | NE 11 | SSE 10 | SSE 10 | SSE 10 | W 12 | SSW 18 | W 11 |
| kJ | 42 | 41 | 8 | 30 | 68 | 57 | 56 | 49 | 54 | 26 | 22 | 5 | 115 | 20 | 19 | 18 | 19 | 19 | 25 | 102 | 37 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 8 | — | — | — | ENE 10 | — | ENE 9 | ENE 5 | ENE 6 | ENE 5 | ENE 8 | ENE 5 | ENE 5 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 7 | ENE 8 | ENE 8 |
| kJ | 313 | 294 | — | — | — | 473 | — | 237 | 51 | 53 | 40 | 99 | 48 | 69 | 181 | 219 | 204 | 289 | 305 | 358 | 310 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 1 | 39 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 1 | 31 | 31 | 31 | 32 | 39 | 32 | 31 | 39 | 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.
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