Surf Forecasts:
Matsube Bay surf forecast from 18 Sep 2026:
- Best quality surf: Monday 21 Sep, 9PM (local time) - 21ft (6.5m), 14s period, SSE swell with cross-offshore winds.
- Most powerful swell: Monday 21 Sep, 9PM (local time) - 21ft (6.5m), 14s period, SSE swell with 15,566 kJ wave energy.
- Next surfable swell (1★+): Monday 21 Sep, 9PM (local time) - 21ft (6.5m), 14s period with SSE swell.
Best Forecast Surf Conditions for Matsube Bay this week:
The surf forecast for Matsube Bay over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 21) at 9PM. The primary swell is predicted to be 6.5m and 14s period with a secondary swell of 2.2m and 10s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Matsube Bay in the next 16 days are 6.5m 14s and forecast to arrive on Monday (Sep 21) at 9PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 3.0m 7s period and expected on Monday (Sep 21) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 21st Sep) | 21ft (6.5m) 14s |
| Best Surf | 9PM (Mon 21st Sep) | 21ft (6.5m) 14s |
| Most Powerful | 9PM (Mon 21st Sep) | 21ft (6.5m) 14s |
Table - best surf conditions forecast for Matsube Bay over the next 16 days.
Short Range ForecastHeavy rain (total 185mm), heaviest during Mon night. Warm (max 27°C on Mon morning, min 20°C on Sun morning). Winds increasing (light winds from the E on Sun night, gales from the NNE by Mon night). | Days 4-6 Weather SummaryMostly dry. Warm (max 25°C on Tue morning, min 21°C on Thu morning). Wind will be generally light. | ||||||||||||||||||||
Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | Wednesday 23 | Thursday 24 | Friday 25 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
Wave Height (m) Direction Period (s) | SE 15 | SE 13 | SE 12 | SE 12 | SE 11 | SSE 12 | SSE 13 | SSE 13 | SSE 12 | ENE 10 | SSE 9 | ENE 10 | ENE 9 | ENE 9 | SE 6 | ENE 9 | SE 6 | SE 6 | ENE 9 | NE 10 | NE 5 |
Wave Graph  | |||||||||||||||||||||
 kJ | 4890 | 3975 | 3225 | 2598 | 2413 | 3609 | 6570 | 7456 | 4412 | 512 | 218 | 175 | 103 | 106 | 92 | 94 | 84 | 59 | 53 | 225 | 38 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross | cross-off | cross-off | cross-off | on | cross-on | cross-off | glassy | cross-on | cross-on | cross | cross-on | cross-on | cross | cross-on | cross-on | cross-on | on | cross-on |
High Tide | 7:24PM1.24m | 7:46PM1.15m | 3:28PM1.16m | 11:46PM1.11m | 3:22PM1.21m | 1:26AM1.17m | 3:32PM1.27m | 2:24AM1.25m | 3:45PM1.32m | 3:10AM1.33m | 4:01PM1.37m | ||||||||||
Low Tide | 5:00AM0.52m | 6:47AM0.49m | 8:11PM1.06m | 7:49AM0.43m | 8:35PM0.94m | 8:31AM0.37m | 9:01PM0.82m | 9:06AM0.34m | 9:27PM0.68m | 9:37AM0.33m | 9:55PM0.54m | ||||||||||
 |  |  |  | |  |  | | | |  |  | | |  | | |  | |  | | |
 | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | 5:24 | — | — | 5:26 | — | — | 5:26 | — | — | 5:28 | — | — |
 | — | 5:40 | — | — | 5:38 | — | — | 5:37 | — | — | 5:37 | — | — | 5:35 | — | — | 5:34 | — | — | 5:31 | — |
mm | — | 2 | 7 | 35 | 23 | 28 | 9 | 25 | 56 | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 23 | 22 | 23 | 21 | 22 | 25 | 27 | 27 | 24 | 25 | 24 | 23 | 24 | 24 | 24 | 23 | 23 | 23 | 25 | 24 | 24 |
Feels °C | 21 | 21 | 23 | 18 | 20 | 29 | 28 | 25 | 17 | 26 | 25 | 23 | 22 | 23 | 25 | 24 | 23 | 24 | 26 | 24 | 25 |
Swell 1 Height (m) Direction Period (s) | SE 15 | SE 13 | SE 12 | SE 12 | SE 11 | SSE 12 | SSE 13 | SSE 13 | SSE 12 | ENE 10 | SSE 9 | ENE 10 | ENE 9 | SSE 6 | NE 9 | ENE 9 | ENE 9 | SE 6 | SE 6 | SSE 5 | ENE 9 |
| kJ | 4890 | 3975 | 3225 | 2598 | 2413 | 3609 | 6570 | 7456 | 4412 | 512 | 218 | 175 | 103 | 54 | 86 | 94 | 70 | 59 | 30 | 11 | 31 |
Swell 2 Height (m) Direction Period (s) | E 10 | E 10 | ENE 10 | E 14 | E 13 | E 12 | E 11 | — | E 10 | SSE 10 | ENE 9 | SSE 8 | S 7 | ENE 9 | E 9 | S 8 | E 9 | ENE 9 | ENE 9 | ESE 8 | ESE 10 |
| kJ | 92 | 125 | 160 | 15 | 30 | 71 | 114 | — | 1732 | 301 | 217 | 116 | 40 | 106 | 6 | 1 | 6 | 54 | 53 | 14 | 34 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | NNE 6 | — | SE 12 | W 7 | WSW 7 | ENE 9 | SSE 6 | S 9 | S 8 | — | SSE 9 | E 9 | ESE 8 | SSE 8 | SSE 5 |
| kJ | — | — | — | — | — | — | 24 | — | 1476 | 1 | 5 | 8 | 6 | 2 | 1 | — | 7 | 14 | 14 | 7 | 2 |
Wind waves Height (m) Direction Period (s) | ENE 8 | ENE 10 | NE 8 | NE 8 | NE 6 | NE 6 | — | — | NNE 8 | — | E 9 | — | E 5 | ENE 5 | SE 6 | SE 6 | SE 6 | — | — | NE 10 | NE 5 |
| kJ | 374 | 394 | 93 | 21 | 199 | 172 | — | — | 547 | — | 113 | — | 47 | 33 | 92 | 75 | 84 | — | — | 225 | 38 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 549 | 47 | 47 | 613 | 613 | 570 | 51 | 570 | 89 | 0 | 15 | 71 | 594 | 1470 | 47 | 2849 | 6 | 6 | 15 | 15 | 15 |
Best forecast wave conditions in Chiba | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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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 Matsube Bay 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.
Information about the Matsube Bay Surf forecast
The above surf forecast table for Matsube Bay provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Matsube Bay can be found by selecting the local surf guide option on the grey menu. Our Matsube Bay surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Matsube Bay) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).
Further information to help with frequently asked questions about our surf forecast for Matsube Bay may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.
Matsube Bay is 2 km (1 miles) from Katsuura. If you plan a holiday in Chiba, look for hotels and other accommodation in Katsuura. Katsuura has rooms for a wide range of budgets as well as car hire and transport links.
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