
Surf Forecasts:
Big Ben surf forecast from 14 Sep 2026:
- Best quality surf: Friday 18 Sep, 9PM (local time) - 10ft (3.0m), 14s period, SE swell with cross-offshore winds.
- Most powerful swell: Saturday 19 Sep, 12AM (local time) - 11ft (3.5m), 14s period, SE swell with 4,395 kJ wave energy.
- Next surfable swell (1★+): Tuesday 15 Sep, 6PM (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 6PM. The primary swell is predicted to be 1.0m and 14s period with a secondary swell of 1.3m and 7s. 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 3.5m 14s and forecast to arrive on Saturday (Sep 19) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 5s period and expected on Sunday (Sep 20) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Tue 15th Sep) | 3.5ft (1.0m) 14s |
| Best Surf | 9PM (Fri 18th Sep) | 10ft (3.0m) 14s |
| Most Powerful | 12AM (Sat 19th Sep) | 11ft (3.5m) 14s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, this is Rusty, and I’m looking at what’s on the cards for Big Ben. Let’s get into it.
First up, the water temp is sitting pretty average for this time of year, so nothing weird going on there.
Right now, we’re in a bit of a flat spell. The first chance to get wet is on Tuesday the 15th, but it’s not gonna set your world on fire. We’ve got a 3ft east swell, period around 14 seconds, so there’s some groundswell in the water, but the wind is a messy cross-shore from the SSW at 12 mph. The energy reading is 522, which is moderate, but it’s just marginal. The jetty there might offer a bit of shelter, but it’s not looking great.
Wednesday the 16th is a little better. Still small at 3-3ft from the east, but the wind switches to a cross-offshore from the north, cleaning things right up. The energy is still in that moderate range (356-423), and the waves should be a bit more lined up. This is probably the best you’ll get in the early part of the week for a beginner-friendly session, but it’s nothing to get emotional about.
Now, here’s where it gets interesting. From Thursday the 17th, things start to ramp up fast, but it’s not all good news. That swell jumps, but the period drops to 7-8 seconds – that’s short-period, wind-driven stuff, and with the NNE wind blowing 19 mph, it’s gonna be a bumpy, messy mess. Not worth paddling out for.
Friday the 18th sees the swell building to 8ft by the morning and then swinging to the SE at 15 seconds by the afternoon. The energy hits 2747 – that’s strong. But that 19 mph cross-off wind is holding on, so it’s clean but mighty. This is starting to get into expert territory, and the beach setup might make it a bit of a handful.
Here’s the real standout, and I’m gonna say it loud: Saturday the 19th. The swell is a solid 10ft out of the southeast, with a long 13-second period. The combined energy is massive at 4081 in the morning. The wind is a cross-offshore from the NE at 16 mph, keeping it clean. But look, I have to be straight with you – this is way too big for the average punter. It’s a straight-up expert-only wave at Big Ben. If you’re not solid, stay on the sand and watch. The crowd will likely be around, but only the brave are getting out.
Sunday the 20th is still solid, with 8ft from the SSE and that groundswell energy (2601), but it’s backed off a bit. The wind stays cross-off. It’s still a big, powerful wave, but it’s getting more manageable for strong intermediates.
After that, we get a bit of a lull mid-week, with 5-7ft SSW swell and cross winds. Nothing special. But then, Tuesday the 22nd afternoon – glassy conditions. The wind drops to 3 mph, and it’s dead calm. The swell is 8ft from the SSW at a very long 14-second period. The energy is 2382. This is clean, powerful, and lined up. This is the other standout for experienced surfers. The long period will make it wall up nicely on the sandbank, but it’s still a proper wave.
The 23rd gets ugly – too big again at 15ft in the morning and then sloppy onshore. Skip it.
After that, it’s a long, quiet stretch. From the 24th of September right through to the 30th, we’re looking at knee-to-waist high stuff, mostly under 5ft, with a mix of cross and cross-off winds. The energy stays weak to moderate (under 1000). There’s a glimmer on the 24th morning with glassy conditions and a 4ft swell, but it’s small. The 30th shows a bump again with 8ft from the south and very long period, but that’s a full week and a half away, so keep an eye on it.
Bottom line: The first few days are small and average. The real juice comes this weekend (19th and 20th) and again on Tuesday the 22nd, but it’s all for the experienced crew. If you’re a beginner, you’re better off waiting for the small glassy window on the 24th morning. After that, it goes quiet for a long stretch.
Stay safe out there.
- Rusty
Short Range ForecastHeavy rain (total 42mm), heaviest during Tue afternoon. Warm (max 26°C on Mon night, min 18°C on Thu afternoon). Winds increasing (calm on Tue night, fresh winds from the NNE by Thu afternoon). | Days 5-7 Weather SummaryHeavy rain (total 57mm), heaviest during Sat morning. Warm (max 25°C on Sun afternoon, min 19°C on Thu night). Winds decreasing (fresh winds from the NNE on Fri morning, light winds from the NNE by Sat night). | ||||||||||||||||||
Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | ||||||||||||||
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 14 | E 14 | E 14 | E 13 | E 13 | E 13 | E 12 | NE 7 | NE 8 | ENE 8 | ENE 9 | SE 15 | SE 14 | SE 13 | SE 13 | SE 12 | SSE 13 | S 12 | S 12 |
Wave Graph | |||||||||||||||||||
384 | 383 | 411 | 345 | 340 | 255 | 184 | 292 | 520 | 864 | 932 | 1857 | 4395 | 3555 | 3242 | 3385 | 1687 | 1335 | 1167 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross | cross-on | cross-off | cross-off | cross-off |
High Tide | 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 | 4:03PM1.29m | |||||||||
Low Tide | 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 | 4:55AM0.53m | |||||||||
— | 5:20 | — | — | 5:22 | — | — | 5:22 | — | — | 5:22 | — | — | 5:24 | — | — | 5:24 | — | — | |
— | — | 5:47 | — | — | 5:45 | — | — | 5:45 | — | — | 5:43 | — | — | 5:42 | — | — | 5:39 | — | |
mm | 4 | 3 | 12 | 6 | 3 | 3 | 9 | 2 | — | — | — | — | 2 | 25 | 18 | 12 | — | — | — |
Temp °C | 26 | 25 | 25 | 24 | 23 | 22 | 22 | 20 | 19 | 20 | 20 | 21 | 20 | 22 | 22 | 23 | 24 | 25 | 22 |
Feels °C | 27 | 27 | 29 | 29 | 24 | 24 | 23 | 17 | 16 | 17 | 17 | 18 | 17 | 21 | 24 | 25 | 25 | 27 | 24 |
Swell 1 Height (m) Direction Period (s) | SE 9 | SE 8 | E 14 | SSE 7 | E 13 | E 13 | E 12 | E 12 | E 11 | SSE 9 | SE 18 | SE 15 | SE 14 | SE 13 | SE 13 | SE 12 | SSE 13 | S 12 | S 12 |
159 | 133 | 411 | 107 | 340 | 255 | 184 | 99 | 91 | 8 | 370 | 1857 | 4395 | 3555 | 3242 | 3385 | 1687 | 1335 | 1167 | |
Swell 2 Height (m) Direction Period (s) | E 14 | E 14 | NE 10 | E 13 | SE 7 | SE 8 | SE 8 | SE 8 | SE 7 | — | SE 8 | — | — | E 10 | E 10 | — | ESE 10 | E 10 | ESE 9 |
384 | 383 | 4 | 345 | 75 | 67 | 63 | 37 | 19 | — | 3 | — | — | 74 | 98 | — | 914 | 830 | 510 | |
Swell 3 Height (m) Direction Period (s) | ENE 7 | S 7 | ENE 10 | SSW 6 | SW 6 | SE 8 | E 16 | ENE 14 | SSE 9 | — | — | — | — | — | — | — | — | E 13 | E 12 |
10 | 1 | 10 | 22 | 8 | 3 | 5 | 40 | 8 | — | — | — | — | — | — | — | — | 30 | 71 | |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 4 | SSE 7 | — | NE 4 | NE 5 | NE 5 | NE 7 | NE 8 | ENE 8 | ENE 9 | ENE 8 | ENE 9 | ENE 8 | ENE 8 | NE 6 | NNE 5 | NE 5 | NE 5 |
12 | 5 | 169 | — | 7 | 31 | 47 | 292 | 520 | 864 | 932 | 890 | 699 | 452 | 383 | 120 | 67 | 124 | 35 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 81 | 30 | 30 | 0 | 35 | 0 | 6 | 273 | 273 | 513 | 530 | 530 | 513 | 595 | 90 | 29 | 6 | 2 | 0 |
Best forecast wave conditions in Chiba | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.










