Surf forecast · Japan · Shonan & Chiba
Surf forecast Onjuku today
Waves, swell and wind at Onjuku (Shonan & Chiba, Japan) today and for the next 3 days, every 3 hours of daylight, with a plain verdict per day — flat, small, fun, good or big, offshore or onshore — and the best window to paddle out.
These numbers are more than 7 hours old, so they are hidden. Open the live waves map for the current sea. Open the waves map centred on Onjuku
Right now
Fun cross-shore.
Onjuku surf forecast, next 3 days
- Flat
- Small
- Fun
- Good
- Big
Sunday 25 October
Fun Best window 06:00–09:00: fun, cross-shore.
| Time | Waves | Swell | Wind |
|---|---|---|---|
| 06:00 | 1.8 m · 7 s ↑SSE | 1.4 m · 6 s ↑SE | 33–42 km/h ↑SW cross-shore |
| 09:00 | 1.9 m · 7 s ↑S | 1.3 m · 6 s ↑SSE | 39–56 km/h ↑SW cross-shore |
| 12:00 | 2.0 m · 7 s ↑S | 1.1 m · 6 s ↑SSE | 40–72 km/h ↑SW cross-shore |
| 15:00 | 2.0 m · 7 s ↑S | 0.9 m · 6 s ↑SSE | 43–76 km/h ↑SW cross-shore |
Monday 26 October
Fun Best window 06:00–09:00: fun, cross-shore.
| Time | Waves | Swell | Wind |
|---|---|---|---|
| 06:00 | 1.4 m · 7 s ↑ESE | 0.6 m · 6 s ↑ENE | 23–37 km/h ↑NE cross-shore |
| 09:00 | 1.4 m · 7 s ↑E | 0.7 m · 6 s ↑ENE | 27–44 km/h ↑NE cross-shore |
| 12:00 | 1.6 m · 6 s ↑E | 0.7 m · 6 s ↑E | 26–44 km/h ↑NE cross-shore |
| 15:00 | 1.5 m · 6 s ↑E | 1.0 m · 5 s ↑ENE | 35–39 km/h ↑NE cross-shore |
Tuesday 27 October
Fun Best window 06:00–09:00: fun, offshore.
| Time | Waves | Swell | Wind |
|---|---|---|---|
| 06:00 | 1.6 m · 7 s ↑ESE | 1.5 m · 6 s ↑E | 17–37 km/h ↑NNW offshore |
| 09:00 | 1.5 m · 7 s ↑ESE | 1.3 m · 6 s ↑E | 24–37 km/h ↑NNW offshore |
| 12:00 | 1.4 m · 7 s ↑ESE | 1.2 m · 6 s ↑E | 24–35 km/h ↑NNW offshore |
| 15:00 | 1.3 m · 7 s ↑SE | 0.9 m · 6 s ↑ENE | 11–22 km/h ↑N cross-shore |
Wednesday 28 October
Fun Best window 15:00–17:00: fun, offshore.
| Time | Waves | Swell | Wind |
|---|---|---|---|
| 06:00 | 1.3 m · 7 s ↑SSE | 1.0 m · 6 s ↑S | 14–32 km/h ↑NNW offshore |
| 09:00 | 1.2 m · 7 s ↑SE | 0.8 m · 6 s ↑S | 20–41 km/h ↑N cross-shore |
| 12:00 | 1.2 m · 7 s ↑E | 0.7 m · 6 s ↑SSW | 21–44 km/h ↑NNW offshore |
| 15:00 | 1.2 m · 7 s ↑E | 0.7 m · 5 s ↑NE | 20–43 km/h ↑NNW offshore |
Every 3 hours of daylight, local time. Waves = significant height of the whole sea, with the peak period; swell = the long-period part. Arrows point where the waves and the wind are going.
Forecast for Sun 04:00 local time · updated 2026-10-24 19:11 UTC
Waves map around Onjuku
Open the waves map centred on Onjuku
Live significant wave height from NOAA WaveWatch III, averaged over 2° cells: coarser than the forecast above, so near the coast it can differ from it.
More about Onjuku
LayEarth Pro
Pro adds GPS jamming, winds aloft, turbulence, 20 aurora cities and the evening-before pollen alerts for Europe — 9 USD/month.
Questions
- Is there surf at Onjuku today?
- Fun: waves 1.8 m at 8 s from SSE, swell 1.4 m · 6 s SSE (Sun 04:00).
- Is the wind offshore at Onjuku?
- Wind 23 km/h from SW: cross-shore for a beach facing SE.
- When is the best time to surf Onjuku today?
- 06:00–09:00 (fun, cross-shore)
- How warm is the water at Onjuku?
- 25.1 °C
- Where do the numbers come from?
- The Open-Meteo Marine API (wave models of Météo-France, ECMWF and NOAA) for a point just off the beach, and the Open-Meteo forecast for the wind. A model at sea, not a surf report: sandbanks, reefs and tide shape the waves you actually get.
Nearby surf spots
Tsurigasaki (Ichinomiya) 22 km · Shichirigahama 80 km · Kugenuma (Shonan) 83 km · Oarai 128 km · Habushiura (Niijima) 132 km · Ikumi 587 km
How it is computed
Hourly Open-Meteo Marine forecast (wave height, peak period and direction, swell) at a point just off Onjuku, and the Open-Meteo wind at 10 m. Size: flat under 0.3 m, small under 0.8 m, fun under 1.5 m, good under 2.5 m (with a period of 8 s or more), big above. Wind: under 8 km/h light; otherwise offshore, cross-shore or onshore from its angle to the direction the beach faces. The best window is the 3 daylight hours with the best mix of size, period and wind. Rebuilt every 3 hours. Live map.