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Surf Forecasts:
Number Fours surfForecast / HAW – Oahu / USA
16 Day Weather and Surf, issued 7 pm Sunday 19 Apr 2026 HSTForecast update in hr min s Forecast update imminent
Number Fours surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Number Fours sea temperature is
24.7° C
(Which is normal for this time of year)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 Sunday (Apr 19) at 11PM. The primary swell is predicted to be 0.4m and 16s period with a secondary swell of 0.8m and 6s. 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 1.4m 7s and forecast to arrive on Sunday (Apr 26) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 7s period and expected on Saturday (Apr 25) at 2AM.
| Wave Type | Time (HST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 11PM (Sun 19th Apr) | 1.5ft (0.4m) 16s |
| Best Surf | 11PM (Sun 19th Apr) | 1.5ft (0.4m) 16s |
| Most Powerful | 11PM (Sun 26th Apr) | 4.5ft (1.4m) 7s |
Table - best surf conditions forecast for Number Fours over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range Forecast Some drizzle, heaviest during Mon afternoon. Warm (max 25°C on Tue afternoon, min 23°C on Sun night). Wind will be generally light. | Days 3-6 Weather Summary Mostly dry. Warm (max 24°C on Wed night, min 22°C on Wed night). Winds increasing (light winds from the NE on Wed night, fresh winds from the NE by Sat afternoon). | |||||||||||||||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sun 26 | ||||||||||||||||
| Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | ||
Rating (10 max) | ||||||||||||||||||||||
Swell Height Map |  |  |  |  |  |  |  |  | ||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||
| Period(s) (?) | 6 | 6 | 14 | 7 | 7 | 8 | 14 | 13 | 13 | 7 | 7 | 11 | 10 | 16 | 16 | 13 | 15 | 16 | 15 | 7 | 14 | |
Wave (?)Graph  | ||||||||||||||||||||||
 kJ (?) | 39 | 26 | 103 | 37 | 27 | 28 | 0 | 0 | 0 | 42 | 39 | 0 | 0 | 25 | 40 | 70 | 115 | 162 | 148 | 169 | 167 | |
Wind (km/h) | ||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross | cross- off | glass | glass | glass | 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 / height (m) | 5:45AM 0.13 | 7:09PM 0.65 | 6:54AM 0.09 | 8:13PM 0.62 | 8:44AM 0.08 | 9:21PM 0.59 | 10:46AM 0.12 | 10:27PM 0.55 | 12:06PM 0.19 | 11:27PM 0.51 | 12:58PM 0.27 | 12:17AM 0.46 | 1:38PM 0.34 | |||||||||
Low Tide / height (m) | 1:42AM 0.04 | 11:13AM -0.08 | 3:11AM 0.03 | 11:58AM -0.04 | 4:34AM 0.02 | 12:59PM 0.01 | 5:34AM -0.01 | 2:32PM 0.07 | 6:16AM -0.02 | 4:20PM 0.10 | 6:49AM -0.04 | 5:52PM 0.11 | 7:15AM -0.05 | 7:05PM 0.10 | ||||||||
Monday 20 | Tuesday 21 | Wednesday 22 | Thursday 23 | Friday 24 | Saturday 25 | Sun 26 | ||||||||||||||||
| Sunrise | - | 6:07 | - | - | 6:07 | - | - | 6:05 | - | - | 6:05 | - | - | 6:05 | - | - | 6:03 | - | - | 6:03 | - | |
| Sunset | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:52 | - | - | 6:53 | - | - | 6:53 | |
 |  |  |  |  | | | | | | | | | | | | | | | | | ||
Rain (mm) | - | - | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | |
| Temp. °C | 24 | 24 | 24 | 23 | 24 | 25 | 24 | 24 | 24 | 24 | 24 | 24 | 23 | 23 | 24 | 23 | 23 | 24 | 23 | 24 | 24 | |
| Feels °C (?) | 26 | 26 | 26 | 24 | 27 | 28 | 27 | 25 | 25 | 26 | 24 | 23 | 21 | 21 | 21 | 20 | 20 | 20 | 20 | 21 | 21 | |
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Number Fours surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
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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