Surf Forecasts:
Kuminatu surf forecast from 29 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 6AM (local time) - 3ft (0.9m), 12s period, ESE swell with cross-offshore winds.
- Most powerful swell: Sunday 6 Sep, 6AM (local time) - 4ft (1.2m), 14s period, S swell with 590 kJ wave energy.
- Next surfable swell (1★+): Sunday 30 Aug, 3PM (local time) - 1.5ft (0.5m), 12s period with E swell.
Best Forecast Surf Conditions for Kuminatu this week:
The surf forecast for Kuminatu over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 30) at 3PM. The primary swell is predicted to be 0.5m and 12s period with a secondary swell of 0.4m and 6s. Another secondary swell of 0.7m and 5s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Kuminatu in the next 16 days are 1.2m 14s and forecast to arrive on Sunday (Sep 06) at 6AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 6s period and expected on Sunday (Sep 06) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Sun 30th Aug) | 1.5ft (0.5m) 12s |
| Best Surf | 6AM (Tue 1st Sep) | 3ft (0.9m) 12s |
| Most Powerful | 6AM (Sun 6th Sep) | 4ft (1.2m) 14s |
Table - best surf conditions forecast for Kuminatu over the next 16 days.
Short Range ForecastSome drizzle, heaviest during Mon morning. Warm (max 27°C on Tue morning, min 23°C on Sun morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 8mm), mostly falling on Fri night. Warm (max 29°C on Thu morning, min 22°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | |||||||||||||||
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) | E 11 | E 12 | E 11 | ESE 14 | ESE 14 | ESE 12 | ESE 12 | E 11 | E 11 | E 10 | E 10 | E 11 | E 11 | SSE 6 | S 6 | S 6 | SW 11 | E 9 | E 6 | E 7 | E 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 66 | 67 | 61 | 68 | 145 | 208 | 232 | 350 | 240 | 174 | 127 | 155 | 141 | 136 | 182 | 112 | 77 | 42 | 148 | 233 | 408 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | off | glassy | cross-on | cross-on | cross-on | cross-on | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off |
High Tide | 6:00PM1.55m | 6:02AM1.52m | 6:21PM1.55m | 6:46AM1.45m | 6:43PM1.53m | 7:35AM1.35m | 7:05PM1.51m | 8:37AM1.23m | 7:28PM1.48m | 10:17AM1.13m | 7:55PM1.44m | 8:34PM1.38m | |||||||||
Low Tide | 11:43AM0.32m | 00:01AM0.45m | 12:11PM0.44m | 00:35AM0.39m | 12:39PM0.58m | 1:13AM0.35m | 1:04PM0.75m | 1:59AM0.34m | 1:27PM0.91m | 2:58AM0.36m | 1:42PM1.05m | 4:20AM0.38m | |||||||||
 | |  |  | | |  | |  | | |  | | | |  | |  |  |  |  | |
 | 5:09 | — | — | 5:09 | — | — | 5:09 | — | — | 5:11 | — | — | 5:11 | — | — | 5:11 | — | — | 5:13 | — | — |
 | — | 6:08 | — | — | 6:07 | — | — | 6:07 | — | — | 6:05 | — | — | 6:04 | — | — | 6:02 | — | — | 6:00 | — |
mm | — | — | — | 1 | — | — | — | — | — | — | — | 2 | — | — | 2 | — | — | 4 | 3 | 6 | 12 |
Temp °C | 26 | 26 | 24 | 25 | 25 | 24 | 27 | 27 | 26 | 28 | 28 | 27 | 29 | 29 | 27 | 25 | 25 | 22 | 21 | 22 | 23 |
Feels °C | 28 | 28 | 27 | 26 | 26 | 25 | 29 | 30 | 31 | 31 | 31 | 30 | 30 | 30 | 28 | 25 | 24 | 20 | 20 | 22 | 23 |
Swell 1 Height (m) Direction Period (s) | ENE 5 | E 12 | E 11 | E 11 | ESE 14 | ESE 12 | ESE 12 | E 11 | E 11 | E 10 | E 10 | E 11 | E 11 | E 10 | E 10 | S 6 | SSE 6 | SE 6 | SW 11 | SW 12 | S 15 |
| kJ | 21 | 67 | 61 | 59 | 145 | 208 | 232 | 350 | 240 | 174 | 127 | 155 | 141 | 98 | 69 | 112 | 59 | 33 | 40 | 68 | 362 |
Swell 2 Height (m) Direction Period (s) | E 11 | SW 6 | SE 10 | SE 9 | E 11 | E 11 | SSW 8 | SSW 8 | E 7 | E 7 | ESE 6 | SSW 8 | SE 7 | SE 10 | SW 12 | E 10 | E 9 | E 9 | E 9 | S 15 | SE 13 |
| kJ | 66 | 14 | 26 | 31 | 57 | 59 | 14 | 14 | 61 | 61 | 56 | 22 | 54 | 15 | 23 | 65 | 62 | 42 | 27 | 113 | 138 |
Swell 3 Height (m) Direction Period (s) | SW 6 | SE 10 | SW 6 | ESE 14 | SE 9 | SSW 8 | ENE 11 | SE 10 | SSW 8 | SSW 8 | SSW 8 | SE 9 | SSW 8 | SW 13 | SE 10 | SW 12 | SW 11 | SW 11 | S 16 | ENE 13 | SW 11 |
| kJ | 19 | 27 | 9 | 68 | 22 | 14 | 23 | 25 | 14 | 27 | 23 | 14 | 73 | 7 | 15 | 49 | 77 | 40 | 20 | 17 | 43 |
Wind waves Height (m) Direction Period (s) | ENE 5 | E 5 | E 5 | ENE 4 | ENE 5 | ENE 5 | ENE 6 | — | — | — | — | SE 6 | — | SSE 6 | S 6 | NNE 2 | NE 5 | ENE 5 | E 6 | E 7 | E 8 |
| kJ | 42 | 25 | 15 | 23 | 34 | 32 | 29 | — | — | — | — | 89 | — | 136 | 182 | 1 | 47 | 31 | 148 | 233 | 408 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 11 | 0 | 0 | 195 | 44 | 11 | 5 | 39 | 0 | 0 | 21 | 21 | 120 | 130 | 26 | 39 | 39 | 5 | 541 | 563 | 524 |
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 Kuminatu 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 Kuminatu Surf forecast
The above surf forecast table for Kuminatu provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Kuminatu can be found by selecting the local surf guide option on the grey menu. Our Kuminatu 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 (Kuminatu) 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 Kuminatu 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.
Kuminatu is 6 km (4 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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