Surf Forecasts:
Number Fours 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 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 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 Fours 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 Fours over the next 16 days.
The Lowdown
Alright, folks. Rusty here. Let’s talk about Number Fours for the next couple of weeks. It’s a bit of a slow start, so don’t get your hopes up for an immediate swell.
The first real shot at a decent session comes on Saturday afternoon, the 12th of September. Before that, Friday is a no-go with tiny, weak swell and a strong cross-off wind that just isn’t doing us any favors.
Saturday afternoon we get a clean little 2ft swell from the SW, with a long 16-second period. The wind is a gentle cross-off from the NE at 9 mph, keeping the surface smooth. The wave energy is weak at 222, so it’s small but playful. Water temp is a comfortable 81°, right about normal for this time of year. Good for beginners and intermediates.
Sunday and Monday are a write-off – poor conditions, tiny swell, and the wind stays up in the cross-off direction.
Things get interesting but messy from Wednesday the 16th. The swell builds from the SW, reaching 3ft by Thursday morning, but the period drops to a short 8 seconds. That’s windswell – bumpy, sectiony, and not fun. The combined energy hits 1032 (moderate), but the wind is a strong breeze at 25 mph cross-off, churning it up. This is expert-only territory due to the size (over 8ft) and poor shape.
The standout window is Saturday afternoon, 12th September. That’s your best bet for a clean, fun session. The 2ft SW swell with a long 22-second period on Monday the 14th afternoon is also a hidden gem – small but with proper shape. The wave energy is a moderate 288, and the wind is a moderate 12 mph cross-off, so it’ll be clean enough for intermediates.
Later in the run, around the 23rd and 24th of September, we get another pulse of size – 7ft to 8ft ENE windswell with a short 8-9 second period. The wind finally turns offshore on the 24th, with a light 9 mph SSE breeze, making the surface glassy. But the short period and big size mean it’s a kitesurfing paradise or a paddle-surfing mission only for the experts. The combined energy is strong at 901-967 (moderate-to-strong).
Bottom line: Your best wave for the average surfer is Saturday afternoon, 12th September – small, clean, and fun. For the adrenaline junkies, the 23rd and 24th offer bigger, cleaner surf, but it’s a beast of a short-period swell. Keep an eye on the forecast for that one, but don’t commit just yet.
Rusty out.
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 | 2 | 1 | 1 | 1 | 31 | 31 | 39 | 42 | 31 | 39 | 39 | 39 |
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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