Surf Forecasts:
Big Ben surf forecast from 13 Sep 2026:
- Best quality surf: Friday 18 Sep, 9PM (local time) - 10ft (3.0m), 16s period, SE swell with cross-offshore winds.
- Most powerful swell: Saturday 19 Sep, 3AM (local time) - 11ft (3.5m), 15s period, SE swell with 5,258 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 3AM (local time) - 3.5ft (1.0m), 14s period with E 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 Tuesday (Sep 15) at 3AM. The primary swell is predicted to be 1.0m and 14s period with a secondary swell of 1.1m and 9s. 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 3.5m 15s and forecast to arrive on Saturday (Sep 19) at 3AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Wednesday (Sep 16) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Tue 15th Sep) | 3.5ft (1.0m) 14s |
| Best Surf | 9PM (Fri 18th Sep) | 10ft (3.0m) 16s |
| Most Powerful | 3AM (Sat 19th Sep) | 11ft (3.5m) 15s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, folks, Rusty here again, but this time in feet and miles per hour. Let's break down what's happening at Big Ben. It's a beach and jetty break, exposed to the swell, and it doesn't break all that often, so we need to pick our moments.
We've got a slow start. The first decent chance is Tuesday afternoon, the 15th of September. The swell is about 3ft from the east, with a long 14-second period. That means better-shaped waves and more energy. The wind is light and cross-offshore, keeping things clean. The combined wave energy is moderate at 549. Not a huge day, but for an inconsistent spot, it's a good one. Water temp is 80°F, which is about normal for this time of year.
Now, mark your calendars for Saturday the 19th and Sunday the 20th of September. We're talking serious size. Saturday morning brings a 12ft swell from the southeast with a 13-second period. The combined energy is a hefty 4577. The wind is light and cross-offshore, so conditions are clean. But at 12ft, this is for experts only – too big for beginners. Sunday morning is similar, with a 10ft swell from the southeast and clean offshore wind. These are the days for the big dogs.
After that, the wind turns onshore and we get a few days of poor surf. There's a huge swell around the 22nd of September, with 25ft waves and a massive combined energy of 19398, but the wind is onshore and it's just too much for this break. Skip it.
Looking to the end of the month, we have a nice small window. On the morning of Friday the 25th of September, the swell drops to about 3ft from the southeast, with an 11-second period. The wind is glassy – dead calm – which means perfect, smooth waves. The combined energy is moderate at 388. It's a small day, but great for beginners or anyone wanting a relaxing session. Then on Sunday the 27th of September, we get 7ft from the east-northeast, with an 8-second period. The wind is glassy again. This is over 8ft, so it's for experts, but the glassy conditions will make it a dream session. The combined energy is strong at 1275.
So, the two best bets are the 19th and 20th for the big, clean swell if you're experienced, and the 25th for a glassy, smaller day that everyone can enjoy. Remember, Big Ben is inconsistent, so these are the windows to chase. If it stays quiet, things can always change.
Rusty out.
Short Range ForecastModerate rain (total 19mm), heaviest on Tue night. Warm (max 27°C on Mon morning, min 22°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 23mm), heaviest during Wed afternoon. Warm (max 23°C on Fri afternoon, min 19°C on Thu night). Mainly fresh winds. | |||||||||||||||||||
Sun 13 | Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | ||||||||||||||
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 13 | E 12 | E 12 | SSE 10 | E 14 | E 14 | E 14 | E 13 | E 13 | E 13 | E 12 | E 12 | ENE 7 | NE 7 | ENE 7 | SE 17 | SE 15 | SE 13 | SE 13 | SSE 12 |
Wave Graph  | ||||||||||||||||||||
 kJ | 276 | 190 | 233 | 218 | 384 | 383 | 411 | 345 | 340 | 255 | 184 | 134 | 259 | 352 | 333 | 2490 | 4351 | 4228 | 3452 | 1795 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross | cross | cross | cross | cross-off | glassy | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on | cross-on |
High Tide | 5:30PM1.56m | 5:58AM1.59m | 5:50PM1.57m | 6:37AM1.52m | 6:10PM1.56m | 7:20AM1.42m | 6:29PM1.55m | 8:11AM1.30m | 6:50PM1.51m | 9:25AM1.19m | 7:10PM1.46m | 7:26PM1.38m | ||||||||
Low Tide | 11:41PM0.39m | 11:55AM0.58m | 00:13AM0.33m | 12:20PM0.71m | 00:48AM0.32m | 12:42PM0.84m | 1:26AM0.34m | 1:01PM0.96m | 2:13AM0.40m | 1:11PM1.08m | 3:15AM0.48m | |||||||||
 |  |  | |  |  | |  |  |  | | | | | |  |  | |  |  | |
 | — | — | 5:20 | — | — | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — |
 | 5:50 | — | — | 5:49 | — | — | 5:47 | — | — | 5:45 | — | — | 5:45 | — | — | 5:43 | — | — | 5:42 | — |
mm | — | — | — | — | — | 1 | 1 | 9 | 8 | 5 | 6 | 1 | 1 | — | — | 1 | 3 | 6 | 13 | 43 |
Temp °C | 25 | 25 | 27 | 27 | 25 | 24 | 25 | 24 | 23 | 22 | 22 | 22 | 22 | 20 | 22 | 23 | 23 | 23 | 23 | 23 |
Feels °C | 29 | 29 | 28 | 28 | 26 | 26 | 28 | 29 | 25 | 24 | 25 | 22 | 20 | 17 | 20 | 22 | 23 | 24 | 25 | 24 |
Swell 1 Height (m) Direction Period (s) | E 13 | E 12 | E 12 | E 12 | SSE 9 | E 14 | SE 7 | SE 7 | E 13 | E 13 | E 12 | E 12 | E 11 | E 11 | E 12 | SE 17 | SE 15 | SE 13 | SE 13 | SSE 12 |
| kJ | 276 | 190 | 233 | 193 | 221 | 383 | 134 | 106 | 340 | 255 | 184 | 134 | 91 | 94 | 99 | 2490 | 4351 | 4228 | 3452 | 1795 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 7 | SE 10 | ENE 15 | E 14 | SE 8 | E 14 | E 13 | SSE 6 | SE 7 | SE 8 | SE 7 | SE 7 | SE 7 | SE 18 | ESE 11 | SE 16 | E 10 | ENE 10 | ESE 10 |
| kJ | 55 | 44 | 74 | 78 | 384 | 114 | 411 | 345 | 69 | 64 | 63 | 33 | 19 | 12 | 152 | 254 | 1847 | 74 | 255 | 1092 |
Swell 3 Height (m) Direction Period (s) | ENE 6 | ENE 6 | ENE 6 | ENE 7 | ENE 6 | SW 7 | NE 10 | — | — | SE 8 | E 16 | ENE 14 | SSE 9 | SSE 9 | SE 21 | — | — | — | — | E 15 |
| kJ | 25 | 16 | 8 | 10 | 4 | 2 | 4 | — | — | 3 | 5 | 40 | 8 | 8 | 220 | — | — | — | — | 4 |
Wind waves Height (m) Direction Period (s) | — | — | SSW 3 | SSE 10 | S 7 | — | — | — | NE 4 | ENE 5 | NE 5 | NE 5 | ENE 7 | NE 7 | ENE 7 | NE 6 | NE 11 | ENE 10 | — | — |
| kJ | — | — | 3 | 218 | 1 | — | — | — | 18 | 51 | 22 | 69 | 259 | 352 | 333 | 150 | 334 | 275 | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 18 | 30 | 121 | 561 | 90 | 35 | 0 | 0 | 6 | 0 | 0 | 184 | 530 | 513 | 273 | 184 | 513 | 553 | 29 | 29 |
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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