Surf Forecasts:
Big Ben surf forecast from 20 Aug 2026:
- Best quality surf: Monday 24 Aug, 6PM (local time) - 10ft (3.0m), 15s period, SSE swell with cross-onshore winds.
- Most powerful swell: Tuesday 25 Aug, 9AM (local time) - 11ft (3.5m), 15s period, S swell with 5,138 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 3AM (local time) - 3.5ft (1.0m), 10s 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 Sunday (Aug 23) at 3AM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.4m and 9s. 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 15s and forecast to arrive on Tuesday (Aug 25) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.3m 2s period and expected on Sunday (Aug 23) at 9AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sun 23rd Aug) | 3.5ft (1.0m) 10s |
| Best Surf | 6PM (Mon 24th Aug) | 10ft (3.0m) 15s |
| Most Powerful | 9AM (Tue 25th Aug) | 11ft (3.5m) 15s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, Rusty here again. Let's break it down in the old measures.
First thing, water temp is a balmy 81°F, which is dead average for the season – no shock there.
We're startin' slow. Thursday the 20th and Friday the 21st are duds – ankle-biters and nasty breezes. Don't even bother.
Saturday the 22nd shows a pulse of moderate energy (254 to 326), but it's bumpy cross-chop. Swell is around 3 feet from the east.
Now, Sunday the 23rd morning is your first real chance. The wind goes glassy, and we've got a clean little 3 foot swell from the ENE. Energy is moderate at 164. It's not huge, but it's clean and surfable – a nice little session for a cruise.
Monday the 24th brings the first proper swell – 7 to 8 feet from the SSE with a very long 15 to 16 second period. Combined energy jumps to 3685 – that's serious power. But the wind is cross-onshore, so it'll be lumpy. This is for the big-wave crew only.
Tuesday the 25th is the standout. A solid 12 foot south swell with a 15 second period. Energy is 5474 – massive. Wind is cross-onshore but the forecast says conditions are favorable for the experienced. This is the day if you've got the nerve and the skills. For everyone else, stay on the beach.
Wednesday the 26th through Friday the 28th stays huge, with swell between 8 and 15 feet, but the wind gets messy and cross-onshore. Energy stays strong to very strong (up to 4367). This is all expert-level, heavy, and mostly poor conditions.
Saturday the 29th is the reset. The swell drops to a clean 2 feet from the east with a nice 13 second period. Energy is moderate at 361. The afternoon goes glassy – perfect for everyone to get a few clean ones after the madness. This is your best bet for a fun, relaxed session.
Sunday the 30th is clean but the swell (5 feet) has a short 6 second period, so it'll be a bit weak and crumbly. Monday the 31st and Tuesday the 1st of September have a bit more east swell but the wind gets bumpy.
Into early September, look to Thursday the 3rd morning – clean 5 foot swell from the ESE, 11 second period, with a fresh offshore breeze. Energy is strong at 1034. The direction isn't perfect, but clean surf is clean surf.
So, to wrap it up: for the big dogs, Tuesday the 25th is *the* standout – a massive, powerful south groundswell for experts only. For the rest of us, Saturday the 29th afternoon is the winner – glassy, clean, and manageable.
Rusty out.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat night. Warm (max 28°C on Thu morning, min 25°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 16mm), heaviest on Sun morning. Warm (max 29°C on Tue morning, min 25°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | |||||||||||||||
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) | SE 11 | SE 11 | SE 11 | SE 11 | E 10 | E 10 | E 10 | E 11 | E 10 | ENE 10 | SSE 15 | SSE 15 | SSE 16 | SSE 15 | SSE 14 | S 15 | S 14 | S 13 | S 12 | S 11 | S 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 42 | 57 | 57 | 58 | 65 | 66 | 175 | 231 | 198 | 128 | 196 | 1374 | 2417 | 3284 | 3387 | 5138 | 4494 | 2873 | 1959 | 2615 | 2906 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | cross-on | cross-on | cross | cross-on | cross | cross | cross | cross | glassy | cross-on | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | cross-on |
High Tide | 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 | 4:50PM1.50m | ||||||||||
Low Tide | 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 | 9:53AM0.22m | 10:14PM0.89m | ||||||||||
 |  |  | | | | | |  |  | |  | |  |  | | |  |  | | | |
 | 5:01 | — | — | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — |
 | — | 6:22 | — | — | 6:22 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — |
mm | — | — | — | — | — | — | — | — | 3 | 5 | 2 | 3 | 1 | 1 | — | — | — | 4 | 12 | 12 | 25 |
Temp °C | 28 | 27 | 26 | 28 | 27 | 26 | 28 | 28 | 26 | 26 | 26 | 25 | 27 | 28 | 26 | 29 | 29 | 27 | 25 | 25 | 26 |
Feels °C | 31 | 29 | 30 | 29 | 28 | 28 | 30 | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 29 | 32 | 32 | 31 | 29 | 28 | 27 |
Swell 1 Height (m) Direction Period (s) | SE 6 | SE 6 | SE 11 | ESE 7 | E 10 | E 10 | E 10 | E 11 | E 10 | ENE 10 | ENE 9 | SSE 15 | SSE 16 | SSE 15 | SSE 14 | S 15 | S 14 | S 13 | E 13 | E 12 | E 15 |
| kJ | 15 | 15 | 57 | 32 | 65 | 66 | 175 | 231 | 198 | 128 | 88 | 1374 | 2417 | 3284 | 3387 | 5138 | 4494 | 2873 | 157 | 103 | 218 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SE 11 | ENE 8 | SSW 9 | SSW 9 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | SSE 15 | E 9 | SSE 19 | E 12 | E 15 | E 14 | E 13 | E 13 | E 18 | E 16 | E 12 |
| kJ | 42 | 57 | 22 | 45 | 44 | 52 | 47 | 46 | 32 | 30 | 196 | 79 | 1094 | 177 | 272 | 320 | 285 | 215 | 54 | 127 | 97 |
Swell 3 Height (m) Direction Period (s) | ENE 9 | ENE 9 | SSW 8 | SE 11 | SE 11 | ESE 11 | SE 10 | SE 10 | S 4 | SSE 4 | ESE 12 | E 12 | E 12 | SSW 10 | SW 10 | SW 10 | SW 10 | E 18 | SE 15 | — | E 12 |
| kJ | 26 | 26 | 14 | 58 | 30 | 47 | 16 | 28 | 9 | 6 | 115 | 106 | 174 | 38 | 15 | 16 | 16 | 27 | 8 | — | 98 |
Wind waves Height (m) Direction Period (s) | — | — | S 2 | SSW 3 | SSW 3 | SSW 3 | S 5 | S 5 | — | NNE 2 | — | — | — | — | SSE 6 | — | — | — | S 12 | S 11 | S 10 |
| kJ | — | — | 1 | 2 | 3 | 4 | 16 | 21 | — | 1 | — | — | — | — | 25 | — | — | — | 1959 | 2615 | 2906 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 30 | 30 | 30 | 35 | 35 | 39 | 35 | 121 | 30 | 0 | 24 | 0 | 30 | 30 | 35 | 532 | 532 | 30 | 29 | 35 | 852 |
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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