Ichinomiya
Japan · Japan
Right now
Mainly clearWind and swell direction
Swell: 0.8m E
Wind: 12 km/h SW (cross-offshore)
Beach faces: E
Cross-offshore wind. Still favourable, expect reasonably clean waves with some texture.
Swell is arriving at a great angle for this beach.
Today hour by hour
Updated 10:19Expected crowds
Prediction model v15amDawn patrol territory
7amMidweek quiet
Next 7 days
Forecast via Open-MeteoWhat to pack
- 3/2mm wetsuit or spring suit for 18°C water.
- Strong winds on some days. Check the forecast each morning.
- Standard shortboard conditions.
Today's briefing
0.8m swell at 7s. Onshore wind creating some chop. Water temperature 18°C.
AI-generated summary for Ichinomiya. Always check local reports before heading out.
Forecast accuracy at Ichinomiya
Not enough data yet. Log a session to help build the accuracy score.
Best time to go
No great windows in the next 2 days
Best available option is Tomorrow around 8am (score: 21). Conditions are below the Good threshold but may still be surfable.
Nearby spots right now
Crowd report
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Session journal
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Create free accountTide
Approximate modelSwell forecast
7-day forecastDaily score breakdown
This week is looking slightly below average for late April.
Comparing the 7-day forecast to the last 5 years of marine data for the same week at Ichinomiya.
What's driving it
Recent form
Last 3 days of logged conditions.
About Ichinomiya
Ichinomiya is a premier, highly exposed beach break situated in the Chiba Prefecture on the eastern coast of Japan. The seafloor is composed of a vast expanse of dark, volcanic sand, structured into defined banks by a series of engineered coastal jetties. Facing directly into the Pacific Ocean, it acts as a swell magnet, capturing robust easterly and south-easterly groundswells, frequently generated by passing summer typhoons. A westerly offshore wind is required to structure the frequently chaotic sea state into rideable peaks. The interaction between the incoming oceanic swell and the groynes produces steep, high-quality A-frame waves that offer fast drops and workable walls. Because the wave energy is significant and the banks can produce hollow shorebreak sections, the location is best suited for intermediate to advanced surfers. It provides a reliable training ground for practising rapid take-offs and high-speed carving manoeuvres.
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Create Profile →Frequently asked questions
How often is this page updated?
Current conditions refresh every 6 hours when the cron runs. Hourly data updates every 30 minutes. The 7-day forecast, luck factor, and packing notes are all pre-computed at the same time.
What is the luck factor?
We compare the 7-day forecast to the last 5 years of marine data for the same week at Ichinomiya. The delta tells you whether conditions are shaping up better, worse, or about the same as a typical late April.
How is 'best session' picked?
We score each day of the 7-day forecast using the same algorithm as the leaderboard, and highlight the highest scorer.
Where does the data come from?
Open-Meteo's Marine API (swell height, period, water temperature) and Weather API (wind and conditions).
Does the score capture local knowledge?
Honestly, no. Every break has tide windows, swell directions and reef contours that a global model cannot see. Treat the score as a starting point, then check a local cam.
When is the best time to surf Ichinomiya?
Check our timing score heatmap above for a week-by-week breakdown combining surf conditions with crowd pressure.