Surf Forecasts:
Big Ben surf forecast from 25 Aug 2026:
- Best quality surf: Tuesday 1 Sep, 6AM (local time) - 3ft (0.9m), 11s period, ENE swell with cross-offshore winds.
- Most powerful swell: Tuesday 25 Aug, 6PM (local time) - 5.5ft (1.7m), 11s period, S swell with 747 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 9AM (local time) - 2ft (0.6m), 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 Thursday (Aug 27) at 9AM. The primary swell is predicted to be 0.6m and 14s period with a secondary swell of 0.6m and 10s. Another secondary swell of 0.6m and 11s is also forecast. Another secondary swell of 0.9m and 6s is also forecast. The wind is predicted to be offshore as the swell arrives.
The most powerful waves expected at Big Ben in the next 16 days are 1.7m 11s and forecast to arrive on Tuesday (Aug 25) 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 1.2m 5s period and expected on Wednesday (Aug 26) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Thu 27th Aug) | 2ft (0.6m) 14s |
| Best Surf | 6AM (Tue 1st Sep) | 3ft (0.9m) 11s |
| Most Powerful | 6PM (Tue 25th Aug) | 5.5ft (1.7m) 11s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright crew, Rusty checkin' in with the imperial rundown for Big Ben. The next two weeks are a bit of a rollercoaster, and honestly, there's a long stretch where you'll be better off doing something else.
Kicking things off, the water temp is about 82°, so it's a touch warmer than usual for this time of year – just a nice bit of comfort.
The 25th has a solid swell push with waves in the 6 to 7 ft range, but the wind is tearing it up from the southwest, creating a nasty cross-chop. The energy is huge (1662), but it's a total mess – not a day for a fun paddle.
From the 26th onward, it gets real quiet. For over a week, right through the end of August and into September, we're looking at waves mostly under 2 ft, sometimes with a clean morning breeze, but never enough oomph to get you excited. There's a gap of about 8 days where nothing really stands out.
There are a few small bright spots. On Thursday, August 27th afternoon, the forecast shows a tiny 2 ft east swell, but the wind goes totally glassy with a north breeze at just 3 mph. The energy is minimal, but for a log or a twinny, that afternoon glass could be your best bet for a clean slide.
Later on, Friday morning, September 4th has a 2 ft southwest swell with zero wind – dead calm. Glassy conditions like that in early September are a treat, so it could be worth a dawn patrol.
The pick of the litter, though, is likely Sunday, September 6th. A 4 ft south swell rolls in with a solid 12-second period and a light east-northeast breeze that should keep it clean. The energy reading hits 919, which is the strongest we see in the whole outlook. That's proper groundswell energy, so the banks could line up well. Expect the crowd to show up though.
So, a whole lot of waiting, but there are a couple of windows worth chasing. Keep your eyes peeled and be ready to move.
Rusty.
Short Range ForecastModerate rain (total 12mm), heaviest on Thu morning. Warm (max 30°C on Wed morning, min 24°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Sat morning. Warm (max 28°C on Fri afternoon, min 23°C on Sat morning). Wind will be generally light. | |||||||||||||||||||
Tue 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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) | S 12 | S 11 | SSW 12 | SSW 12 | SW 11 | E 14 | E 13 | E 13 | E 12 | E 12 | E 12 | E 12 | E 11 | E 11 | E 11 | E 12 | E 12 | SW 10 | S 12 | S 11 |
Wave Graph | ||||||||||||||||||||
895 | 326 | 233 | 196 | 534 | 146 | 173 | 212 | 193 | 139 | 137 | 98 | 93 | 63 | 93 | 99 | 98 | 62 | 175 | 185 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-off | cross | cross | off | cross | cross | cross-off | cross-off | glassy | cross | cross | cross-off | cross | glassy | off | glassy | cross-on | glassy |
High Tide | 4:31PM1.46m | 2:51AM1.43m | 4:50PM1.50m | 3:40AM1.52m | 5:08PM1.52m | 4:23AM1.58m | 5:27PM1.54m | 5:03AM1.61m | 5:47PM1.54m | 5:42AM1.60m | 6:06PM1.55m | 6:21AM1.55m | 6:26PM1.55m | |||||||
Low Tide | 9:46PM1.02m | 9:53AM0.22m | 10:14PM0.89m | 10:28AM0.21m | 10:42PM0.76m | 10:59AM0.24m | 11:10PM0.64m | 11:29AM0.31m | 11:40PM0.54m | 11:57AM0.41m | 00:11AM0.46m | 12:23PM0.54m | 00:45AM0.42m | |||||||
— | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:09 | — | — | 5:09 | — | — | |
6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — | — | 6:09 | — | — | 6:08 | — | |
mm | — | — | — | — | — | 8 | 2 | 2 | — | — | 2 | 3 | — | — | 1 | — | — | — | — | — |
Temp °C | 29 | 27 | 30 | 29 | 27 | 27 | 24 | 26 | 28 | 28 | 25 | 24 | 24 | 24 | 26 | 26 | 25 | 27 | 28 | 25 |
Feels °C | 30 | 28 | 32 | 30 | 29 | 31 | 27 | 28 | 29 | 29 | 29 | 26 | 25 | 26 | 28 | 30 | 29 | 31 | 32 | 29 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 11 | SSW 12 | SSE 9 | SSE 9 | SSE 10 | S 11 | E 13 | E 12 | E 12 | SW 6 | E 12 | E 11 | E 11 | ENE 5 | ENE 6 | ENE 6 | ENE 7 | S 12 | S 11 |
895 | 326 | 233 | 121 | 92 | 72 | 108 | 212 | 193 | 139 | 54 | 98 | 93 | 63 | 26 | 30 | 32 | 40 | 175 | 185 | |
Swell 2 Height (m) Direction Period (s) | E 13 | SSW 12 | SSE 9 | SSW 12 | E 12 | S 11 | E 13 | S 10 | S 9 | S 8 | E 12 | SW 6 | SSW 8 | SE 10 | E 11 | E 12 | E 12 | E 11 | ENE 7 | ENE 11 |
225 | 208 | 121 | 196 | 134 | 88 | 173 | 90 | 39 | 33 | 137 | 32 | 19 | 27 | 93 | 99 | 98 | 62 | 29 | 170 | |
Swell 3 Height (m) Direction Period (s) | — | E 13 | E 12 | E 12 | S 12 | E 14 | E 10 | SSE 10 | SSE 10 | SSE 10 | SSW 8 | SSW 8 | SE 11 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 9 | E 11 | ESE 11 |
— | 215 | 148 | 138 | 72 | 146 | 52 | 37 | 37 | 36 | 21 | 19 | 31 | 11 | 26 | 27 | 28 | 31 | 89 | 43 | |
Wind waves Height (m) Direction Period (s) | SW 4 | SW 5 | SW 5 | SW 5 | SW 11 | SW 6 | SW 5 | SW 6 | SW 6 | SW 6 | SW 6 | NE 4 | ENE 5 | ENE 5 | NE 5 | — | — | SW 10 | SSW 5 | SW 9 |
39 | 68 | 42 | 37 | 534 | 44 | 89 | 36 | 79 | 107 | 135 | 6 | 45 | 46 | 47 | — | — | 60 | 19 | 40 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 70 | 534 | 67 | 30 | 576 | 81 | 34 | 0 | 24 | 0 | 35 | 0 | 184 | 81 | 0 | 0 | 0 | 30 | 0 | 121 |
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.











