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Surf Forecasts:
Katahama surfForecast / Shizuoka / Japan
48hr Weather and Surf, issued 8 pm Friday 17 Apr 2026 JSTForecast update in hr min s Forecast update imminent
Katahama surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Katahama sea temperature is
16.9° C
(Which is 1.9°C colder than average for this time of year)How big are the waves at Katahama today?
The current surf forecast for Katahama at 4AM is: 1.8m 16s primary swell from a South-southeast direction and 1.0m 12s secondary swell from a East direction (forecast issued at 08:00pm April 17). The wind direction is predicted to be cross-offshore and the swell rating is 4.
| Time (JST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (18 Apr) | 6.5ft (2.0m) | 16s |
| Afternoon (18 Apr) | 6.5ft (2.0m) | 15s |
| Evening (18 Apr) | 6.5ft (2.0m) | 15s |
Table - waves today at Katahama. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Fri 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||||||||
| 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |   |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 16 | 16 | 16 | 16 | 16 | 16 | 15 | 15 | 15 | 15 | 15 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 969 | 1451 | 1586 | 1650 | 1788 | 1982 | 1982 | 1907 | 1785 | 1785 | 1835 | 1810 | 1626 | 1604 | 1536 | 1641 | 1956 | 1983 | 2082 | 2024 | 1770 | 1496 | 1367 | 1269 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | on | cross- on | cross- off | cross- off | glass | cross- on | cross- on | cross- on | glass | cross- off | cross- off | cross- off | cross- on | on | cross- on | on | on | cross | cross- off | cross | cross- on | on | on |
High Tide / height (m) | 5:47PM 1.46 | 5:19AM 1.57 | 6:22PM 1.45 | 5:45AM 1.59 | 7:01PM 1.42 | 6:14AM 1.57 | ||||||||||||||||||
Low Tide / height (m) | 11:28PM 0.59 | 11:57AM 0.09 | 11:55PM 0.65 | 12:30PM 0.06 | 12:25AM 0.71 | 1:07PM 0.07 | ||||||||||||||||||
Fri 17 | Saturday 18 | Sunday 19 | Monday 20 | |||||||||||||||||||||
| Sunrise | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:11 | - | - | - | - | - | - | - | 5:09 | - | - | - |
| Sunset | 6:20 | - | - | - | - | - | - | - | 6:20 | - | - | - | - | - | - | - | 6:21 | - | - | - | - | - | - | - |
 |  | |  |  | | | |  |  | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 15 | 15 | 14 | 13 | 13 | 16 | 17 | 17 | 17 | 16 | 16 | 15 | 15 | 17 | 19 | 19 | 18 | 17 | 16 | 16 | 16 | 17 | 18 | 18 |
| Feels °C (?) | 13 | 13 | 12 | 11 | 10 | 15 | 15 | 14 | 16 | 16 | 15 | 14 | 14 | 16 | 18 | 17 | 17 | 17 | 16 | 16 | 15 | 15 | 15 | 14 |
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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