Using Surf-Forecast’s Historical Surf Data To Find The Cleanest Waves On Earth
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Number Fours surfForecast / HAW – Oahu / USA
48hr Weather and Surf, issued 7 pm Wednesday 21 Jan 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
24.8° C
(Which is slightly warmer than usual)How big are the waves at Number Fours today?
The current surf forecast for Number Fours at 12AM is: 0.6m 7s primary swell from a East direction (forecast issued at 07:00pm January 21). An open ocean swell of 0.8m 14s is not directed at the surf break, a second open ocean swell of 0.8m 5s is not directed at the surf break. The wind direction is predicted to be cross-offshore.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (22 Jan) | 3.5ft (1.0m) | 7s |
| Afternoon (22 Jan) | 3ft (0.9m) | 7s |
| Evening (22 Jan) | 2.5ft (0.8m) | 8s |
Table - waves today at Number Fours. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | |||||||||||||||||||||
| 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | 5 PM | 8 PM | 11 PM | 2 AM | 5 AM | 8 AM | 11 AM | 2 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 16 | 7 | 7 | 15 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 8 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 25 | 70 | 39 | 38 | 99 | 93 | 93 | 91 | 81 | 75 | 60 | 60 | 60 | 79 | 43 | 44 | 45 | 45 | 82 | 80 | 61 | 60 | 29 | 29 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross- off | 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 | cross | on | glass | on |
High Tide / height (m) | 6:18PM 0.30 | 6:15AM 0.58 | 7:15PM 0.34 | 6:47AM 0.50 | 8:21PM 0.38 | 7:20AM 0.42 | ||||||||||||||||||
Low Tide / height (m) | 11:28PM 0.08 | 1:15PM 0.02 | 12:25AM 0.14 | 1:45PM 0.01 | 1:40AM 0.20 | |||||||||||||||||||
Wednesday 21 | Thursday 22 | Friday 23 | Saturday 24 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 7:09 | - | - | - | - | - | - | - | 7:09 | - | - | - | - | - | - | - | 7:09 | - | - |
| Sunset | 6:14 | - | - | - | - | - | - | - | 6:14 | - | - | - | - | - | - | - | 6:15 | - | - | - | - | - | - | - |
 |  | | |  | |  | | | | | | | | | | | | | | | |  | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | 2 |
| Temp. °C | 23 | 23 | 23 | 22 | 22 | 22 | 23 | 23 | 23 | 22 | 22 | 22 | 22 | 22 | 23 | 23 | 23 | 22 | 23 | 23 | 23 | 23 | 21 | 21 |
| Feels °C (?) | 19 | 20 | 22 | 21 | 21 | 21 | 22 | 22 | 21 | 21 | 22 | 22 | 21 | 21 | 22 | 22 | 22 | 22 | 24 | 23 | 24 | 23 | 23 | 22 |
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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.
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