Surf Forecasts:
Big Ben surf forecast from 19 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 6AM (local time) - 10ft (3.0m), 15s period, S swell with onshore winds.
- Most powerful swell: Wednesday 26 Aug, 9AM (local time) - 10ft (3.0m), 16s period, S swell with 4,174 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 3AM (local time) - 1.5ft (0.4m), 10s period with SE 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 20) at 3AM. The primary swell is predicted to be 0.4m and 10s period with a secondary swell of 0.5m and 5s. Another secondary swell of 0.5m and 8s is also forecast. 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 3.0m 16s and forecast to arrive on Wednesday (Aug 26) at 9AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 4s period and expected on Sunday (Aug 23) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Thu 20th Aug) | 1.5ft (0.4m) 10s |
| Best Surf | 6AM (Wed 26th Aug) | 10ft (3.0m) 15s |
| Most Powerful | 9AM (Wed 26th Aug) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, crew, Rusty here with the straight talk on the waves.
We're looking at a pretty quiet start. The first few days are a dud. From the 19th through the 23rd of August, the waves are tiny and messy, around 2 to 3 feet from the E or SE, with weak energy. Winds are all over the place, cross-shore and cross-onshore, keeping the surface rough. Not worth paddling out.
Then we get a solid window. Monday morning, August 24th is your target at Big Ben. We’ve got a clean 5-foot SSE groundswell with a long 14-second period. The energy is moderate, and here’s the kicker: the wind is glass. That means smooth, clean faces. It's a beach/jetty break, so that long period might make it a little walled, but with those conditions, it's the best wave on offer. It's a bit much for beginners at that size.
Tuesday the 25th brings more size—around 6 feet—but the wind gets messy, putting some chop on the face. The power is there, just not the perfection of the day before.
And then the door slams shut. From the 26th of August through the 1st of September, the swell explodes, hitting 8 to 15 feet. That's giant, expert-only stuff, and the forecast says it's too big for this spot. The wave energy readings are massive, but it's not for surfing. You'll get a few smaller days in there, but the wind is onshore and it's all just a washing machine.
We get one more look on the morning of September 2nd. The swell drops to a still-chunky 8 feet from the SSE, but the wind turns offshore, cleaning things up nicely. It's still a solid, powerful wave, but the most rideable we'll see after the big swell.
The clear standout is Monday, August 24th. That 5-foot glassy morning with a long-period swell is your best shot. Mark it on the calendar.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Thu morning, min 24°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 7mm), mostly falling on Sat night. Warm (max 29°C on Tue morning, min 24°C on Sat night). Wind will be generally light. | |||||||||||||||||||
Wed 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
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 9 | SE 10 | SE 11 | SE 11 | SE 11 | SE 11 | E 10 | E 10 | E 11 | E 11 | E 10 | ENE 10 | E 9 | SSE 12 | SSE 14 | SSE 13 | SSE 16 | SSE 14 | SSE 13 | S 15 |
Wave Graph | ||||||||||||||||||||
39 | 37 | 42 | 57 | 57 | 58 | 65 | 66 | 189 | 227 | 202 | 128 | 83 | 196 | 899 | 756 | 1025 | 1454 | 1077 | 2716 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | on | cross-on | cross-on | cross | cross-on | cross | cross | cross | glassy | cross | cross-on | cross | glassy | cross-on | cross | cross | cross-on | cross-on |
High Tide | 7:46PM1.47m | 9:31AM1.15m | 8:09PM1.44m | 8:37PM1.39m | 9:26PM1.33m | 4:10PM1.33m | 00:01AM1.29m | 4:16PM1.41m | 1:46AM1.34m | 4:31PM1.46m | 2:51AM1.43m | |||||||||
Low Tide | 2:52AM0.50m | 1:53PM0.97m | 4:00AM0.52m | 5:40AM0.51m | 7:19AM0.44m | 8:35PM1.23m | 8:26AM0.35m | 9:17PM1.13m | 9:13AM0.27m | 9:46PM1.02m | ||||||||||
— | — | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | |
6:23 | — | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | |
mm | — | — | — | — | — | — | — | — | — | — | 1 | 2 | 2 | 2 | — | — | — | — | — | — |
Temp °C | 27 | 25 | 28 | 27 | 25 | 28 | 28 | 26 | 28 | 28 | 26 | 26 | 26 | 24 | 28 | 28 | 26 | 29 | 29 | 26 |
Feels °C | 30 | 28 | 30 | 29 | 28 | 29 | 30 | 29 | 29 | 29 | 30 | 29 | 29 | 28 | 32 | 31 | 30 | 31 | 32 | 30 |
Swell 1 Height (m) Direction Period (s) | SE 6 | SE 6 | SE 6 | SE 6 | SE 11 | SSW 9 | E 10 | E 10 | E 11 | E 11 | E 10 | ENE 10 | E 9 | SSE 12 | SSE 14 | SSE 13 | SSE 16 | SSE 14 | SSE 13 | S 15 |
22 | 20 | 15 | 15 | 57 | 45 | 65 | 66 | 189 | 227 | 202 | 128 | 83 | 196 | 899 | 756 | 1025 | 1454 | 1077 | 2716 | |
Swell 2 Height (m) Direction Period (s) | E 9 | E 8 | SE 11 | SE 11 | ENE 8 | SE 11 | SSW 9 | SSW 10 | SSE 5 | SSW 9 | S 5 | SSW 9 | ESE 12 | ENE 9 | E 12 | E 12 | SSE 12 | S 17 | S 16 | E 13 |
39 | 37 | 42 | 57 | 22 | 58 | 44 | 52 | 28 | 47 | 13 | 46 | 83 | 84 | 99 | 175 | 347 | 443 | 728 | 268 | |
Swell 3 Height (m) Direction Period (s) | SE 10 | SE 10 | ENE 9 | ENE 9 | SSW 8 | ENE 8 | SE 11 | ESE 11 | SSW 9 | SE 11 | SSW 9 | ESE 13 | SSW 9 | E 12 | E 9 | SW 10 | E 11 | E 11 | E 13 | SW 10 |
36 | 36 | 26 | 26 | 23 | 21 | 30 | 47 | 47 | 29 | 56 | 55 | 45 | 106 | 39 | 48 | 152 | 114 | 277 | 15 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | SE 5 | SSW 5 | SSE 5 | SSE 5 | — | S 5 | — | NE 5 | ENE 4 | — | — | — | — | — | — | — |
— | — | — | — | 10 | 3 | 8 | 28 | — | 25 | — | 19 | 12 | — | — | — | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 39 | 121 | 121 | 0 | 6 | 22 | 6 | 0 | 30 | 35 | 30 | 30 | 30 |
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.











