Surf Forecasts:
Big Ben surf forecast from 9 Sep 2026:
- Best quality surf: Friday 11 Sep, 12AM (local time) - 4ft (1.2m), 7s period, ENE swell with cross-offshore winds.
- Most powerful swell: Wednesday 9 Sep, 6PM (local time) - 8ft (2.5m), 9s period, SSW swell with 933 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 12AM (local time) - 4ft (1.2m), 7s period with ENE 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 Friday (Sep 11) at 12AM. The primary swell is predicted to be 1.2m and 7s period with a secondary swell of 0.8m and 8s. Another secondary swell of 0.5m and 14s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Big Ben in the next 16 days are 2.5m 9s and forecast to arrive on Wednesday (Sep 09) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 4s period and expected on Tuesday (Sep 15) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 11th Sep) | 4ft (1.2m) 7s |
| Best Surf | 12AM (Fri 11th Sep) | 4ft (1.2m) 7s |
| Most Powerful | 6PM (Wed 9th Sep) | 8ft (2.5m) 9s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Right, listen up. Rusty here. Let’s talk about what’s coming at Big Ben.
Alright, straight up – the first half of this run is a write-off. For the first week and a bit, we’re looking at a whole lot of nothing that’s worth paddling out for. The bulk of the energy is wild and messy, with big, wind-affected swell. There’s a short window around Thursday the 11th with some tiny, clean little waves, but at 2 feet, it’s barely a ripple. You’ll be fighting for scraps. Don’t get your hopes up until we get past the middle of the month.
The real story, the one that’s got my heart thumping, is the weekend of the 20th and 21st of September. That’s the stand-out. We’ve got a proper, long-period groundswell from the S-SSW rolling in. Saturday the 20th sees it building to 7 feet, but by Sunday the 21st of September, it’s peaking with a 8 foot swell from the SSW, with a stunning 16-second period. The energy is massive. Now, this is big, expert-only territory – over 8 feet on Monday, so keep the beginners on the beach. The kicker? The wind on Sunday morning is glassy. Absolutely glassy. That’s a goldilocks zone for a wave this size. The water is a touch warmer than normal for this time of year, sitting at 83°F.
This spot is a beach/jetty affair, and with that long period, it’s going to be a freight train. It’ll be clean, powerful, and for the crew who know what they’re doing, it’s going to be epic. The downside is that crowds can be a factor here, so get in early. After that peak, the winds get messy again, and the swell drops off quickly, so that Sunday morning window is the one to circle.
A few days later, on the 24th, the swell drops back under 7 feet, but the wind is finally cross-off, offering a cleaner, more manageable option for the less experienced. Not a classic, but a salvageable end to the run.
Rusty
Short Range ForecastHeavy rain (total 30mm), heaviest during Wed night. Warm (max 28°C on Wed afternoon, min 19°C on Wed night). Winds decreasing (fresh winds from the SW on Wed afternoon, light winds from the N by Fri night). | Days 5-7 Weather SummaryLight rain (total 5mm), mostly falling on Sat afternoon. Warm (max 28°C on Tue morning, min 23°C on Sat afternoon). Wind will be generally light. | |||||||||||||||||||
Wed 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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) | SSW 9 | S 9 | NE 7 | ENE 7 | ENE 7 | E 14 | E 14 | E 14 | E 14 | ESE 13 | ESE 13 | E 13 | E 13 | E 12 | SE 9 | SE 9 | E 14 | E 14 | E 14 | E 13 |
Wave Graph  | ||||||||||||||||||||
 kJ | 1081 | 562 | 211 | 237 | 148 | 144 | 140 | 183 | 236 | 299 | 295 | 272 | 276 | 236 | 272 | 260 | 315 | 366 | 333 | 280 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross | on | cross-on | cross-on | cross-on | cross-on | cross | cross | cross-off |
High Tide | 4:17PM1.48m | 3:18AM1.48m | 4:35PM1.51m | 4:02AM1.57m | 4:53PM1.53m | 4:42AM1.62m | 5:12PM1.55m | 5:20AM1.63m | 5:30PM1.56m | 5:58AM1.59m | 5:50PM1.57m | 6:37AM1.52m | 6:10PM1.56m | |||||||
Low Tide | 9:48PM0.87m | 9:59AM0.30m | 10:15PM0.72m | 10:31AM0.32m | 10:42PM0.59m | 11:01AM0.38m | 11:11PM0.48m | 11:29AM0.47m | 11:41PM0.39m | 11:55AM0.58m | 00:13AM0.33m | 12:20PM0.71m | 00:48AM0.32m | |||||||
 |  |  |  |  | | |  |  | |  |  |  |  | | | | | |  | |
 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | 5:20 | — | — | 5:20 | — | — | 5:20 | — | — |
 | 5:55 | — | — | 5:54 | — | — | 5:52 | — | — | 5:52 | — | — | 5:50 | — | — | 5:49 | — | — | 5:47 | — |
mm | 3 | 17 | — | 1 | 1 | 1 | 5 | 1 | 1 | 1 | — | — | — | 1 | — | — | 1 | 2 | — | — |
Temp °C | 28 | 22 | 21 | 21 | 20 | 20 | 20 | 20 | 23 | 23 | 23 | 27 | 27 | 26 | 27 | 27 | 25 | 28 | 28 | 25 |
Feels °C | 28 | 22 | 21 | 20 | 20 | 21 | 21 | 22 | 25 | 25 | 26 | 32 | 31 | 30 | 29 | 28 | 27 | 30 | 30 | 26 |
Swell 1 Height (m) Direction Period (s) | SE 10 | S 9 | S 8 | S 8 | S 8 | ENE 6 | S 8 | E 14 | E 14 | ESE 13 | ESE 13 | E 13 | E 13 | SE 9 | SE 9 | SE 9 | SE 8 | SE 8 | SE 8 | SSE 8 |
| kJ | 28 | 562 | 205 | 133 | 82 | 47 | 41 | 183 | 236 | 299 | 295 | 272 | 276 | 104 | 272 | 260 | 191 | 145 | 250 | 183 |
Swell 2 Height (m) Direction Period (s) | ENE 9 | E 16 | E 15 | E 15 | E 14 | S 8 | E 14 | S 8 | S 8 | SSW 7 | SSW 7 | SE 9 | SE 8 | E 12 | E 12 | E 12 | E 14 | E 14 | E 14 | E 13 |
| kJ | 17 | 43 | 68 | 67 | 100 | 57 | 140 | 29 | 29 | 18 | 9 | 40 | 78 | 236 | 184 | 190 | 315 | 366 | 333 | 280 |
Swell 3 Height (m) Direction Period (s) | E 16 | ESE 11 | ESE 11 | SE 11 | SE 10 | E 14 | ESE 10 | SE 10 | ESE 9 | — | SSW 7 | NE 6 | NE 6 | ENE 6 | E 16 | ENE 15 | ENE 8 | ENE 8 | ENE 10 | ENE 10 |
| kJ | 46 | 12 | 11 | 18 | 16 | 144 | 37 | 24 | 47 | — | 16 | 10 | 10 | 4 | 45 | 78 | 6 | 6 | 10 | 36 |
Wind waves Height (m) Direction Period (s) | SSW 9 | NE 7 | NE 7 | ENE 7 | ENE 7 | NE 6 | ENE 6 | ENE 5 | ENE 6 | ENE 6 | ENE 6 | — | — | — | SW 7 | SW 7 | W 4 | — | S 7 | — |
| kJ | 1081 | 312 | 211 | 237 | 148 | 59 | 22 | 16 | 22 | 23 | 23 | — | — | — | 2 | 2 | 9 | — | 1 | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 561 | 70 | 183 | 29 | 57 | 22 | 0 | 0 | 0 | 0 | 35 | 2 | 35 | 35 | 0 | 30 | 30 | 30 | 30 | 35 |
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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