Surf Forecasts:
Big Ben surf forecast from 8 Aug 2026:
- Best quality surf: Sunday 9 Aug, 12AM (local time) - 6ft (1.9m), 14s period, ESE swell with glassy winds.
- Most powerful swell: Tuesday 11 Aug, 6AM (local time) - 8ft (2.5m), 11s period, ENE swell with 1,487 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 12AM (local time) - 6ft (1.9m), 14s period with ESE swell.
Best Forecast Surf Conditions for Big Ben this week:
The surf forecast for Big Ben over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 09) at 12AM. The primary swell is predicted to be 1.9m and 14s period with a secondary swell of 1.1m and 11s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Big Ben in the next 16 days are 2.5m 11s and forecast to arrive on Tuesday (Aug 11) at 6AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Monday (Aug 10) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 9th Aug) | 6ft (1.9m) 14s |
| Best Surf | 12AM (Sun 9th Aug) | 6ft (1.9m) 14s |
| Most Powerful | 6AM (Tue 11th Aug) | 8ft (2.5m) 11s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, Rusty here with a look at Big Ben. The first part of the forecast is a bit of a scrap, but there are two windows that stand out above the rest.
Your best bet is going to be the morning of Sunday, the 9th of August. We’ve got a solid 7ft easterly swell with a long 13-second period, pumping in with some serious energy (1631). The wind is glassy, just a slight air from the east-northeast. That’s going to be clean, powerful, and a proper session for experienced surfers. Water temp is sitting about average for this time of year.
The other good shout is Tuesday morning, the 11th of August. The swell is coming in at 7ft from the east with a 12-second period (energy at 1232), and we’ve got a clean cross-off breeze from the west. That’ll smooth out the surface nicely for the more seasoned crew. Expect there to be a few others out.
After that, the middle of the first week goes flat and ugly from Wednesday the 12th onwards. The second half of the outlook, from around the 18th of August, brings some bigger swell back—up to 8ft—but the period drops way down to 8 or 9 seconds. That’s a short, dumpy wave, and most of those days come with a cross-onshore wind, making for a lumpy, choppy mess. Even the bigger energy reading of 2072 on Tuesday the 18th morning is let down by the wind.
The very end of the run, from the 22nd of August, is just small stuff with the swell dropping to only 2ft. The Saturday morning of the 22nd has a glassy 4ft easterly swell, so maybe a fun little longboard session, but it’s not worth the hype.
Rusty.
Short Range ForecastLight rain (total 3mm), mostly falling on Tue afternoon. Warm (max 29°C on Sun morning, min 22°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 45mm), heaviest during Tue night. Warm (max 28°C on Wed afternoon, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | ||||||||||||||
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) | ESE 14 | E 13 | E 13 | E 12 | E 12 | E 12 | ENE 10 | E 11 | E 12 | ENE 11 | E 10 | SSW 11 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 | E 10 |
Wave Graph  | |||||||||||||||||||
 kJ | 1360 | 1421 | 1207 | 1065 | 1344 | 1406 | 1258 | 1104 | 1117 | 503 | 240 | 222 | 307 | 326 | 369 | 490 | 656 | 840 | 1019 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | glassy | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-on | cross-on | cross-on | cross | cross | cross-on | cross | cross | cross-on | cross-off |
High Tide | 11:10PM1.33m | 4:23PM1.35m | 00:59AM1.34m | 4:40PM1.42m | 2:16AM1.40m | 5:00PM1.47m | 3:13AM1.47m | 5:21PM1.50m | 4:00AM1.54m | 5:41PM1.52m | 4:43AM1.58m | 6:02PM1.53m | |||||||
Low Tide | 8:04AM0.35m | 8:47PM1.21m | 8:59AM0.25m | 9:34PM1.12m | 9:42AM0.17m | 10:08PM1.02m | 10:20AM0.13m | 10:38PM0.92m | 10:54AM0.14m | 11:08PM0.81m | 11:26AM0.18m | 11:38PM0.70m | |||||||
 |  | |  | |  | | |  |  | | | | |  | | |  | | |
 | — | 4:52 | — | — | 4:54 | — | — | 4:54 | — | — | 4:56 | — | — | 4:56 | — | — | 4:56 | — | — |
 | 6:36 | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — |
mm | — | — | — | — | — | — | — | — | 3 | 16 | 8 | 3 | 2 | 1 | — | 5 | 3 | 7 | 5 |
Temp °C | 25 | 29 | 28 | 25 | 28 | 27 | 23 | 24 | 25 | 25 | 26 | 28 | 25 | 27 | 28 | 25 | 28 | 27 | 25 |
Feels °C | 28 | 31 | 30 | 27 | 27 | 26 | 23 | 25 | 25 | 25 | 28 | 30 | 28 | 29 | 29 | 28 | 29 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | ESE 14 | E 13 | E 13 | E 12 | E 12 | E 12 | E 10 | E 11 | E 12 | ENE 11 | E 10 | E 9 | E 10 | E 10 | E 10 | E 10 | E 10 | SSW 9 | E 10 |
| kJ | 1360 | 1421 | 1207 | 1065 | 1344 | 1406 | 899 | 1104 | 1117 | 503 | 240 | 171 | 307 | 326 | 369 | 490 | 656 | 34 | 1019 |
Swell 2 Height (m) Direction Period (s) | SSW 11 | SSW 10 | SSW 11 | SW 12 | SW 12 | SW 11 | SSW 10 | SSW 10 | SSW 11 | SSW 10 | SSW 11 | SSW 11 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SW 10 | S 10 | SSE 10 |
| kJ | 297 | 210 | 226 | 146 | 139 | 80 | 85 | 83 | 88 | 86 | 151 | 222 | 176 | 92 | 88 | 64 | 44 | 48 | 56 |
Swell 3 Height (m) Direction Period (s) | SW 14 | — | SSW 10 | SSW 10 | SSW 12 | SSW 11 | SW 11 | SW 11 | SW 11 | SW 10 | S 5 | E 5 | SE 12 | SE 11 | SSE 12 | SE 11 | SE 11 | SSE 11 | SSW 9 |
| kJ | 29 | — | 187 | 110 | 104 | 93 | 58 | 45 | 44 | 52 | 16 | 17 | 21 | 20 | 13 | 19 | 19 | 12 | 32 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | ENE 10 | — | SSW 3 | SSW 5 | SSW 5 | S 5 | — | NE 3 | — | — | — | E 10 | — |
| kJ | — | — | — | — | — | — | 1258 | — | 3 | 56 | 21 | 24 | — | 5 | — | — | — | 840 | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 35 | 0 | 35 | 29 | 29 | 0 | 35 | 30 | 48 | 22 | 6 | 29 | 29 | 6 | 184 | 534 | 0 |
Best forecast wave conditions in Chiba | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
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Information about the Big Ben Surf forecast
The above surf forecast table for Big Ben provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Big Ben can be found by selecting the local surf guide option on the grey menu. Our Big Ben 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 (Big Ben) 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 Big Ben 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.
Big Ben is 3 km (2 miles) from Kawaguchi. If you plan a holiday in Chiba, look for hotels and other accommodation in Kawaguchi. Kawaguchi has rooms for a wide range of budgets as well as car hire and transport links.
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