Surf Forecasts:
Number Threes surf forecast from 11 Sep 2026:
- Best quality surf: Saturday 12 Sep, 5PM (local time) - 1.5ft (0.5m), 16s period, SW swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 2AM (local time) - 3.5ft (1.0m), 18s period, SSW swell with 644 kJ wave energy.
- Next surfable swell (1★+): Saturday 12 Sep, 5PM (local time) - 1.5ft (0.5m), 16s period with SW swell.
Best Forecast Surf Conditions for Number Threes this week:
The surf forecast for Number Threes over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 12) at 5PM. The primary swell is predicted to be 0.5m and 16s period with a secondary swell of 0.7m and 10s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Number Threes in the next 16 days are 1.0m 18s and forecast to arrive on Friday (Sep 18) 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 1.1m 9s period and expected on Sunday (Sep 13) at 8PM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Sat 12th Sep) | 1.5ft (0.5m) 16s |
| Best Surf | 5PM (Sat 12th Sep) | 1.5ft (0.5m) 16s |
| Most Powerful | 2AM (Fri 18th Sep) | 3.5ft (1.0m) 18s |
Table - best surf conditions forecast for Number Threes over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s take a look at what’s cooking.
Right, straight up, the next few days are a bit of a grind. We’ve got some small swell and a persistent cross-off breeze, so don’t expect much magic. The best bet on offer is a small window Saturday afternoon, the 12th of September. The waves are only around 2ft from the SSW, but it’s a clean, light breeze out of the NE, and the water’s a balmy 81°, right on average for this time of year. The swell energy is weak, only about 222 (moderate wave energy), so it’s a session for the longboard or a fun mid-length. Don't expect much power.
Saturday morning’s a write-off, and Sunday the 13th is flat and clean but basically unsurfable. Monday the 14th morning is tiny. Things stay marginal through the week, with the swell picking up a bit by Wednesday the 16th, but that wind is getting solid – 25 mph from the ENE – making it a choppy, messy affair.
Now, looking further into the second week, there’s a real shift. Thursday the 17th of September sees a jump in swell size, around 7ft to 7ft, but the period drops to 8 or 9 seconds. That’s short-period, wind-driven stuff, and combined with that strong 25 mph cross-off, it’s going to be a battle. The wave energy is strong (1032 – 1081), but it’s more about surviving than surfing well. Not a standout.
The one to circle, if you’re advanced and love a bit of size, is Wednesday the 23rd of September. We’re looking at 7ft to 8ft of ENE swell, period around 8 seconds, but the wind eases to a moderate breeze from the ENE. The combined energy is strong (964 – 967), and for Number Threes, that’s a lot of water moving. At over 8ft, it’s pushing into expert-only territory, and with a short period like that, it won’t be the cleanest, but the power is undeniable. Keep your eye on that one.
Overall, the first week is a battle for scraps. The second week has more size, with that Wednesday the 23rd being the big dog on the block, but the consistency and wind are still working against us. Crowds are often at Number Threes, so if the swell aligns, expect company.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Fri morning, min 24°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Tue afternoon, min 25°C on Mon morning). Winds increasing (light winds from the NE on Mon morning, strong winds from the ENE by Wed afternoon). | ||||||||||||||||||||
Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | |||||||||||||||
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) | SW 16 | E 11 | ENE 10 | SW 15 | SW 16 | ENE 9 | SW 15 | SSW 15 | SW 12 | SW 23 | SW 22 | SW 21 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | ENE 8 | ENE 9 | SSW 18 |
Wave Graph  | |||||||||||||||||||||
 kJ | 261 | 286 | 245 | 242 | 124 | 84 | 107 | 84 | 38 | 86 | 227 | 224 | 392 | 384 | 470 | 455 | 541 | 429 | 614 | 603 | 644 |
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 | cross-off |
High Tide | 4:12PM0.57m | 4:51AM0.54m | 4:42PM0.50m | 5:31AM0.57m | 5:11PM0.43m | 6:14AM0.58m | 5:40PM0.36m | 7:02AM0.58m | 6:07PM0.30m | 7:59AM0.57m | 6:32PM0.25m | 9:10AM0.56m | 7:25PM0.21m | ||||||||
Low Tide | 10:02AM0.10m | 10:33PM0.04m | 10:52AM0.13m | 10:56PM0.05m | 11:45AM0.17m | 11:19PM0.06m | 12:45PM0.20m | 11:42PM0.08m | 2:03PM0.23m | 00:07AM0.11m | 4:06PM0.24m | 00:38AM0.13m | 7:14PM0.21m | 1:26AM0.16m | |||||||
 | |  | | | | | |  | | | |  | | | | | | | | | |
 | 6:16 | — | — | 6:16 | — | — | 6:16 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — | 6:18 | — | — |
 | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 25 | 26 | 26 | 26 | 26 | 26 | 25 | 26 | 26 | 25 | 26 | 27 | 26 | 26 | 27 | 26 | 26 | 27 | 26 |
Feels °C | 25 | 24 | 25 | 25 | 26 | 26 | 25 | 25 | 25 | 24 | 24 | 24 | 27 | 27 | 25 | 25 | 25 | 24 | 24 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | ENE 7 | E 11 | ENE 10 | ENE 10 | NE 9 | NNE 9 | NE 9 | NNE 9 | NE 9 | NE 8 | SW 22 | NNE 8 | SW 20 | SW 19 | SSW 19 | SW 18 | SSW 18 | SW 17 | SW 16 | SW 16 | SSW 18 |
| kJ | 99 | 286 | 245 | 169 | 81 | 99 | 115 | 99 | 77 | 74 | 227 | 44 | 392 | 384 | 470 | 455 | 541 | 429 | 258 | 258 | 644 |
Swell 2 Height (m) Direction Period (s) | ENE 11 | SW 15 | SW 15 | NE 8 | ENE 10 | ENE 9 | SW 15 | SSW 15 | SW 12 | SW 14 | SW 14 | SW 21 | NNE 8 | E 11 | NNE 8 | SW 12 | SW 11 | E 10 | SSW 20 | SSW 19 | SSE 10 |
| kJ | 128 | 229 | 226 | 74 | 98 | 84 | 107 | 84 | 38 | 49 | 49 | 224 | 21 | 41 | 50 | 35 | 31 | 94 | 149 | 210 | 9 |
Swell 3 Height (m) Direction Period (s) | SW 16 | NNE 8 | SSE 6 | SW 15 | SW 16 | SSW 13 | ENE 9 | ENE 9 | ENE 8 | SW 23 | SSW 11 | SSW 13 | SW 13 | SW 12 | E 11 | WSW 8 | WSW 10 | SW 11 | SSW 11 | SSE 10 | W 10 |
| kJ | 261 | 51 | 10 | 242 | 124 | 68 | 26 | 25 | 14 | 86 | 12 | 68 | 42 | 38 | 58 | 6 | 9 | 19 | 11 | 10 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | E 5 | ENE 4 | NE 5 | ENE 5 | NE 8 | ENE 5 | NE 8 | NE 8 | ENE 6 | ENE 6 | ENE 7 | ENE 7 | ENE 8 | ENE 9 | ENE 9 |
| kJ | — | — | — | — | — | — | 24 | 11 | 25 | 17 | 129 | 38 | 84 | 108 | 42 | 183 | 265 | 340 | 614 | 603 | 534 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 31 | 1 | 1 | 1 | 0 | 1 | 31 | 1 | 7 | 3 | 1 | 1 | 1 | 31 | 31 | 39 | 42 | 32 | 39 | 40 | 39 |
Best forecast wave conditions in Oahu | |||||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||||
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Information about the Number Threes Surf forecast
The above surf forecast table for Number Threes provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Number Threes can be found by selecting the local surf guide option on the grey menu. Our Number Threes 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 Threes) 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 Threes 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 Threes 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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