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Surf Forecasts:
Kuminatu surfForecast / Chiba / Japan
16 Day Weather and Surf, issued 8 am Sunday 31 May 2026 JSTForecast update in hr min s Forecast update imminent
Kuminatu surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Kuminatu sea temperature is
21.8° C
(Which is normal for this time of year)Kuminatu surf forecast from 31 May 2026:
- Best quality surf: Thursday 4 Jun, 12AM (local time) - 10ft (3.0m), 13s period, SW swell with cross-offshore winds.
- Most powerful swell: Wednesday 3 Jun, 9PM (local time) - 13ft (4.0m), 14s period, SW swell with 5,891 kJ wave energy.
- Next surfable swell (1★+): Thursday 4 Jun, 12AM (local time) - 10ft (3.0m), 13s period with SW 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 Thursday (Jun 04) at 12AM. The primary swell is predicted to be 3.0m and 13s period with a secondary swell of 3.5m and 10s. 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 4.0m 14s and forecast to arrive on Wednesday (Jun 03) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.8m 6s period and expected on Thursday (Jun 04) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Thu 4th Jun) | 10ft (3.0m) 13s |
| Best Surf | 12AM (Thu 4th Jun) | 10ft (3.0m) 13s |
| Most Powerful | 9PM (Wed 3rd Jun) | 13ft (4.0m) 14s |
Table - best surf conditions forecast for Kuminatu over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastLight rain (total 6mm), mostly falling on Tue night. Warm (max 23°C on Sun morning, min 19°C on Sun night). Mainly fresh winds. | Days 4-6 Weather SummaryHeavy rain (total 201mm), heaviest during Wed afternoon. Warm (max 21°C on Wed night, min 17°C on Thu night). Winds decreasing (near gales from the ENE on Wed afternoon, light winds from the NE by Fri night). | ||||||||||||||||||||
Sunday 31 | Monday 1 | Tuesday 2 | Wednesday 3 | Thursday 4 | Friday 5 | Saturday 6 | |||||||||||||||
AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||||
E 10 | ESE 10 | S 11 | S 11 | SSW 15 | SSW 13 | S 12 | SSW 14 | SW 13 | SE 7 | SSE 10 | SW 13 | NE 9 | NE 10 | ENE 10 | ENE 11 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 11 | |
161 | 167 | 160 | 149 | 196 | 307 | 383 | 486 | 376 | 662 | 4147 | 3471 | 865 | 600 | 836 | 687 | 673 | 571 | 365 | 326 | 281 | |
Wind (km/h) | |||||||||||||||||||||
cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | cross-on | cross | cross-off | off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | |
High Tide | 5:46PM1.28m | 3:56AM1.35m | 6:25PM1.28m | 4:28AM1.35m | 7:03PM1.26m | 5:02AM1.34m | 7:41PM1.25m | 5:39AM1.31m | 8:19PM1.24m | 6:18AM1.28m | 8:58PM1.23m | 7:02AM1.22m | 9:37PM1.23m | ||||||||
Low Tide | 10:33AM0.04m | 10:45PM0.87m | 11:07AM0.02m | 11:20PM0.88m | 11:42AM0.02m | 11:56PM0.89m | 12:19PM0.05m | 00:32AM0.90m | 12:57PM0.10m | 1:13AM0.90m | 1:36PM0.17m | 1:59AM0.90m | 2:18PM0.26m | 2:56AM0.88m | |||||||
 | |  |  | |  | | |  |  | |  | |  |  | | | | | | | |
 | 4:26 | — | — | 4:26 | — | — | 4:26 | — | — | 4:24 | — | — | 4:24 | — | — | 4:24 | — | — | 4:24 | — | — |
 | — | 6:45 | — | — | 6:46 | — | — | 6:47 | — | — | 6:47 | — | — | 6:49 | — | — | 6:49 | — | — | 6:50 | — |
— | — | — | — | — | — | — | — | 6 | 44 | 97 | 60 | — | — | — | — | — | — | — | — | — | |
Temp °C | 23 | 23 | 20 | 22 | 22 | 21 | 22 | 22 | 22 | 20 | 19 | 21 | 21 | 21 | 18 | 19 | 19 | 17 | 18 | 18 | 17 |
24 | 22 | 15 | 21 | 20 | 20 | 21 | 21 | 22 | 15 | 13 | 18 | 18 | 18 | 14 | 14 | 15 | 13 | 15 | 15 | 14 | |
Swell 1 Height (m) Direction Period (s) | E 10 | ESE 10 | S 11 | S 11 | S 10 | SSW 13 | S 12 | SSW 14 | SW 13 | SW 15 | SW 16 | SE 10 | NE 9 | SE 9 | SE 9 | ENE 11 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | ENE 11 |
 kJ | 161 | 167 | 160 | 149 | 174 | 307 | 383 | 486 | 376 | 432 | 1631 | 2210 | 362 | 269 | 73 | 687 | 673 | 571 | 365 | 326 | 281 |
Swell 2 Height (m) Direction Period (s) | S 6 | S 12 | E 10 | E 10 | E 10 | E 10 | E 10 | E 9 | E 9 | WSW 19 | SSW 20 | SW 13 | SW 11 | SW 10 | SW 9 | SSW 8 | ESE 9 | SE 8 | SSW 7 | SE 9 | SSW 7 |
| kJ | 15 | 72 | 125 | 92 | 90 | 89 | 65 | 62 | 60 | 142 | 40 | 3471 | 488 | 167 | 65 | 50 | 52 | 33 | 15 | 20 | 9 |
Swell 3 Height (m) Direction Period (s) | S 14 | SSW 14 | SSE 12 | SSE 5 | SSW 15 | SW 16 | SW 15 | SE 11 | SE 11 | S 13 | — | S 11 | SE 10 | S 9 | S 8 | SE 8 | SSW 8 | SSW 7 | SE 8 | SE 11 | ESE 9 |
| kJ | 33 | 69 | 15 | 13 | 196 | 96 | 181 | 20 | 20 | 3 | — | 524 | 348 | 59 | 32 | 57 | 33 | 18 | 16 | 5 | 16 |
Wind waves Height (m) Direction Period (s) | — | SSW 3 | SSW 6 | SW 5 | SW 4 | SSE 4 | SSE 4 | SSE 4 | SSE 6 | SE 7 | SSE 10 | WNW 6 | NE 9 | NE 10 | ENE 10 | — | — | — | — | SSW 7 | SSE 4 |
| kJ | — | 2 | 108 | 18 | 9 | 4 | 10 | 28 | 87 | 662 | 4147 | 204 | 865 | 600 | 836 | — | — | — | — | 9 | 16 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 5 | 21 | 91 | 48 | 21 | 91 | 21 | 21 | 21 | 870 | 605 | 188 | 106 | 188 | 524 | 195 | 545 | 545 | 1540 | 605 | 605 |
Best forecast wave conditions in Chiba | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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FREE! Surf-Forecast.com widget for your website
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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