Surf Forecasts:
Big Ben surf forecast from 9 Sep 2026:
- Best quality surf: Friday 11 Sep, 12AM (local time) - 5.5ft (1.7m), 7s period, ENE swell with cross-offshore winds.
- Most powerful swell: Thursday 10 Sep, 3AM (local time) - 5.5ft (1.7m), 9s period, S swell with 435 kJ wave energy.
- Next surfable swell (1★+): Friday 11 Sep, 12AM (local time) - 5.5ft (1.7m), 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 1.7m and 7s period with a secondary swell of 1.4m and 7s. Another secondary swell of 0.8m and 8s 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 1.7m 9s and forecast to arrive on Thursday (Sep 10) at 3AM. 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 Thursday (Sep 17) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Fri 11th Sep) | 5.5ft (1.7m) 7s |
| Best Surf | 12AM (Fri 11th Sep) | 5.5ft (1.7m) 7s |
| Most Powerful | 3AM (Thu 10th Sep) | 5.5ft (1.7m) 9s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what’s happening at Big Ben over the next 16 days. It’s a bit of a slow start, but there’s a few things to keep an eye on.
Water temp is about where you’d expect it for the season, so no drama there.
The beginning is small and a bit inconsistent. From Thursday the 10th through Saturday the 12th, the swell is tiny, running 2ft to 3ft, with a long period of 14 seconds on Friday and Saturday. That long period at a beach and jetty spot can make the waves a bit straight and difficult to ride. The wind is cross-off from the NNE, so it’s clean, but the energy is moderate. It’s a beginner-friendly size, but nothing special.
Sunday the 13th and Monday the 14th are a no-go. The wind turns onshore, the swell shifts to the SE, and the conditions get choppy and poor.
Tuesday the 15th to Thursday the 17th is mostly marginal. Wednesday the 16th morning has a clean window with 3ft of ENE swell at 13 seconds and moderate wave energy, but it’s still nothing to get excited about. The rest of that week is small and messy.
Saturday the 19th sees a bump in size to 4ft to 5ft of SE swell, but the wind is messy, and the quality is poor. Skip it.
Now, the real standout is Sunday the 20th. We’ve got a solid pulse coming in. Morning shows 8ft from the SSE with a very long 16-second period. The combined wave energy is strong (3334). The wind is light and cross from the NE, keeping it glassy. This is a proper groundswell. At 8ft, it’s for experts only. If you’ve got the skills, this is the best session on the board. The afternoon drops to 7ft, still solid, but with a light onshore breeze. Crowds are possible, so be ready.
From Monday the 21st to Thursday the 24th, the swell just keeps growing. We’re talking 12ft to 28ft from the S and SSW, with extreme wave energy. The wind is cross-on, and by Wednesday the 23rd, it’s a full gale. That’s not paddle surfing – that’s kite surfing territory, no question.
By Friday the 25th, it drops back to a small 4ft of SW swell, but the quality is poor. Window’s closed.
So, if you’re looking for the one day to get out, make it Sunday the 20th. That’s your best shot. Everything else is either too small, too messy, or way too big. The stuff in the second week looks promising on paper, but it’s gonna be a beast for most.
Rusty.
Short Range ForecastHeavy rain (total 30mm), heaviest during Wed night. Warm (max 23°C on Sat morning, min 19°C on Wed night). Mainly fresh winds. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Mon night. Warm (max 28°C on Mon morning, min 22°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | Tuesday 15 | ||||||||||||||
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) | S 9 | NE 7 | ENE 7 | ENE 7 | E 14 | E 14 | E 14 | E 14 | E 13 | ESE 13 | E 13 | E 13 | E 12 | SE 9 | SE 9 | E 14 | E 14 | E 14 | E 13 |
Wave Graph  | |||||||||||||||||||
 kJ | 562 | 239 | 263 | 282 | 144 | 140 | 183 | 236 | 289 | 295 | 272 | 273 | 190 | 188 | 241 | 384 | 248 | 329 | 222 |
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-off | cross | on | cross-on | cross-on | cross-on | cross | cross | cross | glassy |
High Tide | 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 | — | — |
 | — | — | 5:54 | — | — | 5:52 | — | — | 5:52 | — | — | 5:50 | — | — | 5:49 | — | — | 5:47 | — |
mm | 17 | 2 | 3 | 4 | — | 2 | 1 | — | 1 | — | — | — | 1 | — | — | 5 | 1 | — | — |
Temp °C | 22 | 20 | 21 | 19 | 19 | 20 | 20 | 23 | 23 | 22 | 26 | 26 | 26 | 28 | 27 | 25 | 28 | 27 | 25 |
Feels °C | 21 | 19 | 20 | 18 | 20 | 21 | 21 | 25 | 25 | 24 | 30 | 30 | 30 | 30 | 28 | 28 | 30 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 8 | S 8 | ENE 7 | ENE 6 | S 8 | E 14 | E 14 | E 13 | ESE 13 | E 13 | E 13 | SE 9 | SE 9 | SE 9 | SE 7 | SE 8 | SE 8 | SE 8 |
| kJ | 562 | 239 | 133 | 203 | 59 | 41 | 183 | 236 | 289 | 295 | 272 | 273 | 123 | 188 | 241 | 139 | 248 | 226 | 163 |
Swell 2 Height (m) Direction Period (s) | E 16 | E 15 | E 15 | S 8 | S 8 | E 14 | S 8 | SSW 7 | SSW 7 | SSW 7 | SSE 9 | SE 8 | E 12 | E 12 | E 12 | E 14 | E 14 | E 14 | E 13 |
| kJ | 43 | 68 | 67 | 82 | 57 | 140 | 29 | 18 | 18 | 9 | 53 | 93 | 190 | 184 | 193 | 384 | 243 | 329 | 222 |
Swell 3 Height (m) Direction Period (s) | ESE 11 | SE 11 | SE 11 | E 14 | E 14 | ESE 10 | SE 10 | ESE 9 | — | SSW 7 | ENE 6 | NE 6 | NE 7 | E 16 | ENE 15 | ENE 7 | ENE 10 | ENE 10 | ENE 10 |
| kJ | 11 | 18 | 18 | 100 | 144 | 37 | 24 | 32 | — | 19 | 16 | 11 | 12 | 45 | 78 | 5 | 10 | 10 | 18 |
Wind waves Height (m) Direction Period (s) | NE 6 | NE 7 | ENE 7 | ENE 7 | — | ENE 6 | ENE 5 | NE 6 | NE 6 | ENE 6 | NE 6 | — | — | — | — | — | — | — | — |
| kJ | 275 | 210 | 263 | 282 | — | 28 | 24 | 32 | 32 | 21 | 25 | — | — | — | — | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 184 | 29 | 29 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 30 | 30 | 30 | 30 | 30 | 90 | 35 | 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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