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Number Fours surfForecast / HAW – Oahu / USA
48hr Weather and Surf, issued 7 am Tuesday 21 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
24.6° C
(Which is normal for this time of year)How big are the waves at Number Fours today?
The current surf forecast for Number Fours at 11AM is: 0.5m 7s primary swell from a East direction (forecast issued at 07:00am April 21). An open ocean swell of 0.8m 8s is not directed at the surf break, a second open ocean swell of 0.5m 16s is not directed at the surf break. The wind direction is predicted to be glassy.
| Time (HST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (21 Apr) | 1.5ft (0.5m) | 7s |
| Afternoon (21 Apr) | 1.5ft (0.5m) | 8s |
| Evening (21 Apr) | - | - |
Table - waves today at Number Fours. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 21 | Wednesday 22 | Thursday 23 | Fri 24 | |||||||||||||||||||||
| 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 | 5 PM | 8 PM | 11 PM | 2 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 7 | 7 | 7 | 8 | 8 | 14 | 15 | 15 | 7 | 14 | 13 | 7 | 7 | 7 | 7 | 12 | 7 | 7 | 11 | 11 | 10 | 10 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 25 | 26 | 27 | 28 | 28 | 0 | 0 | 0 | 27 | 0 | 0 | 37 | 36 | 38 | 39 | 0 | 39 | 39 | 0 | 0 | 0 | 0 | 0 | 0 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | glass | glass | 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 | cross- off | cross- off | cross- off |
High Tide / height (m) | 6:54AM 0.09 | 8:13PM 0.62 | 8:44AM 0.08 | 9:21PM 0.59 | 10:46AM 0.12 | 10:27PM 0.55 | ||||||||||||||||||
Low Tide / height (m) | 3:11AM 0.03 | 11:58AM -0.04 | 4:34AM 0.02 | 12:59PM 0.01 | 5:34AM -0.01 | 2:32PM 0.07 | ||||||||||||||||||
Tuesday 21 | Wednesday 22 | Thursday 23 | Fri 24 | |||||||||||||||||||||
| Sunrise | - | 6:07 | - | - | - | - | - | - | - | 6:05 | - | - | - | - | - | - | - | 6:05 | - | - | - | - | - | - |
| Sunset | - | - | - | - | 6:52 | - | - | - | - | - | - | - | 6:52 | - | - | - | - | - | - | - | 6:52 | - | - | - |
 |  |  | |  |  | | | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 23 | 24 | 24 | 24 | 25 | 24 | 24 | 23 | 23 | 23 | 25 | 24 | 25 | 24 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 23 | 22 | 22 |
| Feels °C (?) | 26 | 28 | 27 | 27 | 29 | 27 | 26 | 25 | 25 | 25 | 27 | 25 | 26 | 25 | 24 | 24 | 24 | 23 | 23 | 23 | 23 | 22 | 20 | 20 |
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