
Surf Forecasts:
Big Ben surf forecast from 10 Aug 2026:
- Best quality surf: Tuesday 11 Aug, 12AM (local time) - 10ft (3.0m), 10s period, ENE swell with cross-offshore winds.
- Most powerful swell: Monday 17 Aug, 9AM (local time) - 10ft (3.0m), 10s period, E swell with 1,729 kJ wave energy.
- Next surfable swell (1★+): Tuesday 11 Aug, 12AM (local time) - 10ft (3.0m), 10s 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 Tuesday (Aug 11) at 12AM. The primary swell is predicted to be 3.0m and 10s period with a secondary swell of 2.3m and 10s. Another secondary swell of 0.5m and 10s 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 3.0m 10s and forecast to arrive on Monday (Aug 17) at 9AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Saturday (Aug 15) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Tue 11th Aug) | 10ft (3.0m) 10s |
| Best Surf | 12AM (Tue 11th Aug) | 10ft (3.0m) 10s |
| Most Powerful | 9AM (Mon 17th Aug) | 10ft (3.0m) 10s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s have a look at what’s cookin’ over the next couple of weeks for Big Ben.
Well, straight up, this isn’t the most consistent run we’ve ever seen. There are going to be some good windows, but also some proper flat spells and grovel sessions. The first few days are a real mixed bag – we’ve got some size but the wind is all over the shop, often making things pretty average. Water temp’s sitting around 81°, which is about normal for this time of year, so no crazy surprises there in terms of what you’re wearing.
The standout window for the first week is looking like Sunday the 16th. The morning session is the pick. You’re looking at a solid 7ft east swell with clean conditions off a light westerly breeze. The combined energy is running at 955, a nice moderate pulse that will actually offer some decent shaped waves. It’s not monstrous, but it’s the best quality on offer by a long shot in the first part of the run. For a spot that can be a bit inconsistent, having that energy with clean conditions is the one to point the car at.
After that, things get a bit sketchy. Monday the 17th morning has a lot of size – 10ft on the east – but that’s just too much juice for a beach/jetty setup, real expert territory only, and the wind is up too making it messy. Honestly, that Monday looks more interesting for a kite surfer than a paddle surfer.
Then there’s a real dry spell. From the afternoon of Tuesday the 18th all the way through to Friday the 21st, the surf really drops off. Swell heights tumbling down below 3ft, periods dropping to 8 or 9 seconds, and the wind is mostly onshore or cross-onshore. That stretch is a proper write-off – you’re looking at close to four days where it’s just not worth paddling out unless you’re desperate.
Hope comes back on Saturday the 22nd. The morning has a clean 6ft east swell (energy at 545), and then the afternoon... oh boy, the afternoon is special. Clean 6ft swell, but the wind drops to glassy. That’s an absolute gem of a session if the forecast holds. That afternoon is your other true standout – glassy conditions, chest to shoulder high waves, and a solid period of 9 seconds. Perfect for a longboard or a fun shortboard.
From Sunday the 23rd onward, the swell drops away again and the wind goes onshore. By the 24th and 25th, we’re down to 2ft with long period (13-second) groundswell pushing through, but the onshore wind is just going to chop it all up. You might get a clean face at a river or point, but at a beach break like Big Ben, that long period stuff just walls up and closes out. Not worth the fight.
So bottom line: Saturday 16th morning is your best early bet, and that glassy Saturday 22nd afternoon is the one to circle on the calendar. Everything else is slim pickins.
Rusty.
Short Range ForecastHeavy rain (total 44mm), heaviest during Tue afternoon. Warm (max 28°C on Mon morning, min 21°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 12mm), heaviest on Thu morning. Warm (max 28°C on Fri morning, min 21°C on Sat night). Winds decreasing (fresh winds from the NE on Sat morning, light winds from the WNW by Sat night). | ||||||||||||||||||||
Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | |||||||||||||||
AM | 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 12 | E 11 | ENE 10 | ENE 12 | ENE 12 | ENE 11 | ESE 10 | E 9 | E 9 | E 10 | E 10 | E 11 | E 10 | E 11 | E 10 | ENE 10 | ENE 10 | E 9 | E 10 | E 10 | E 10 |
Wave Graph | |||||||||||||||||||||
1472 | 1389 | 1465 | 1462 | 1413 | 772 | 540 | 211 | 293 | 440 | 524 | 639 | 535 | 573 | 596 | 523 | 586 | 568 | 800 | 867 | 1333 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross | cross-off | cross-off | cross | cross-on | cross-on | cross-off | cross-off | cross | cross | cross-off | cross-off | cross | cross | cross | cross | cross-off | cross-off | cross | cross |
High Tide | 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 | 5:24AM1.59m | 6:22PM1.53m | 6:04AM1.56m | 6:42PM1.52m | ||||||||
Low Tide | 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 | 11:57AM0.26m | 00:10AM0.61m | 12:25PM0.38m | 00:43AM0.54m | ||||||||
4:54 | — | — | 4:54 | — | — | 4:56 | — | — | 4:56 | — | — | 4:56 | — | — | 4:58 | — | — | 4:58 | — | — | |
— | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | — | 6:30 | — | — | 6:29 | — | — | 6:28 | — | |
mm | — | — | — | — | 12 | 28 | 3 | 1 | — | 3 | 2 | — | 2 | 1 | 4 | — | — | — | — | — | — |
Temp °C | 28 | 28 | 24 | 26 | 24 | 23 | 25 | 25 | 23 | 27 | 27 | 24 | 28 | 28 | 25 | 28 | 28 | 24 | 27 | 28 | 26 |
Feels °C | 27 | 27 | 24 | 26 | 25 | 22 | 27 | 26 | 25 | 30 | 29 | 27 | 30 | 29 | 27 | 26 | 26 | 23 | 27 | 29 | 29 |
Swell 1 Height (m) Direction Period (s) | E 12 | SW 11 | ENE 10 | ENE 12 | ENE 12 | ENE 11 | SSW 10 | E 9 | E 9 | E 10 | E 10 | E 11 | E 10 | E 11 | E 10 | ENE 10 | SE 9 | E 9 | E 10 | E 10 | E 10 |
1472 | 80 | 1040 | 1462 | 1413 | 772 | 80 | 211 | 293 | 440 | 524 | 639 | 535 | 573 | 596 | 523 | 83 | 445 | 800 | 708 | 1058 | |
Swell 2 Height (m) Direction Period (s) | SW 12 | SSW 11 | SSW 10 | SSW 10 | SSW 10 | SW 11 | SW 12 | SE 5 | SSW 10 | SSW 10 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSE 10 | SE 10 | SSW 11 | SSW 12 | SSW 11 | SSW 10 | SSW 9 |
139 | 93 | 62 | 60 | 60 | 42 | 47 | 38 | 68 | 86 | 85 | 58 | 56 | 48 | 73 | 96 | 65 | 107 | 88 | 75 | 48 | |
Swell 3 Height (m) Direction Period (s) | SSW 12 | SSE 11 | SW 11 | SW 11 | SW 11 | SE 13 | SE 12 | SSW 10 | S 6 | S 5 | SSE 12 | SE 11 | SSE 12 | SSE 11 | SSW 9 | SW 9 | SSE 13 | SSE 8 | SE 12 | SE 11 | SE 11 |
106 | 11 | 58 | 45 | 43 | 26 | 24 | 95 | 15 | 2 | 13 | 19 | 27 | 47 | 32 | 20 | 16 | 45 | 67 | 59 | 30 | |
Wind waves Height (m) Direction Period (s) | NNE 5 | E 11 | ENE 10 | NE 9 | — | SSW 5 | ESE 10 | — | NE 8 | — | — | — | — | — | — | NNE 5 | ENE 10 | E 9 | — | E 10 | E 10 |
69 | 1389 | 1465 | 640 | — | 80 | 540 | — | 46 | — | — | — | — | — | — | 46 | 586 | 568 | — | 867 | 1333 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 48 | 29 | 29 | 6 | 30 | 30 | 30 | 0 | 0 | 22 | 29 | 0 | 35 | 29 | 6 | 177 | 29 | 29 | 0 | 56 | 30 |
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.











