
Surf Forecasts:
Big Ben surf forecast from 4 Aug 2026:
- Best quality surf: Wednesday 5 Aug, 12AM (local time) - 13ft (4.0m), 16s period, SE swell with cross-offshore winds.
- Most powerful swell: Wednesday 5 Aug, 12AM (local time) - 13ft (4.0m), 16s period, SE swell with 8,201 kJ wave energy.
- Next surfable swell (1★+): Wednesday 5 Aug, 12AM (local time) - 13ft (4.0m), 16s 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 Wednesday (Aug 05) at 12AM. The primary swell is predicted to be 4.0m and 16s period with a secondary swell of 0.4m and 13s. 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 4.0m 16s and forecast to arrive on Wednesday (Aug 05) 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 1.6m 6s period and expected on Monday (Aug 10) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Wed 5th Aug) | 13ft (4.0m) 16s |
| Best Surf | 12AM (Wed 5th Aug) | 13ft (4.0m) 16s |
| Most Powerful | 12AM (Wed 5th Aug) | 13ft (4.0m) 16s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
G’day, I’m Rusty, and I’ve been sifting through the numbers for Big Ben. This is a tricky one. The swell is enormous for the first few days, and this spot is a beach/jetty that’s inconsistent and only for beginners when it’s tiny. From the 4th of August, we’re looking at 12ft to 13ft of SE swell with a long period of 15-16 seconds, and the combined energy is massive (6398 to 7353). That’s way too big for a beginner spot, and the cross-shore winds are going to wreck it. The water temperature is 82°, which is a touch warmer than normal.
So, we’ve got a gap. From the 4th through the 8th, it’s either too big or the conditions are poor. The 7th and 8th drop to 8ft-8ft, but the wind is onshore and the scores are low. The first real chance comes on the 10th of August. Monday morning, the swell drops to 7ft from the SW with a very long 17-second period, and the wind goes cross-offshore from the NNE. That’s clean. The energy is still solid (4838). It’s still a bit big for a beginner, but the long-period groundswell could give some nice lines if the jetty works. The afternoon is similar, with a fresh breeze, but still clean. That’s the best window early on.
The 12th of August brings 8ft E swell with a 12-13 second period and clean cross-off winds, but the energy is lower (2611). It’s rideable. Then things get small. The 13th has a tiny 6ft E swell, but the wind is light and cross-off in the afternoon, with low energy (905). The forecast says “very good surf conditions,” but it’s weak.
The 18th of August is a tease. Tuesday morning, we’ve got 12ft of ESE swell with a 12-second period and cross-offshore winds. The energy is 3484, and the wind is clean. But again, it’s too big for a beginner break. If you’re an expert, it might be fun, but the cross-shore chop will be messy.
The only standout I can see is the 10th of August, Monday morning. The 7ft SW swell, very long period, and clean cross-off winds make for the best chance of a clean, lined-up wave at the jetty. It’s still big, but it’s the best on offer. The crowds are “sometimes” an issue, so keep an eye out. The 18th is a close second, but only for the experienced.
So, there’s plenty of swell, but not much quality. The first few days are a washout, and the second week fades into small, choppy stuff. The forecasts can change, but right now, the 10th is your window. Rusty out.
Short Range ForecastLight rain (total 5mm), mostly falling on Wed night. Warm (max 29°C on Thu morning, min 22°C on Tue night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Warm (max 28°C on Sat morning, min 23°C on Sun night). Winds increasing (calm on Fri night, fresh winds from the NNE by Mon afternoon). | ||||||||||||||||||
Wednesday 5 | Thursday 6 | Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | ||||||||||||||
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 16 | SE 15 | SE 14 | SSE 13 | S 13 | S 13 | S 13 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 16 | SW 16 | ENE 12 | ENE 12 | ENE 11 |
Wave Graph | |||||||||||||||||||
8201 | 6936 | 5810 | 2809 | 2056 | 2005 | 1811 | 2041 | 1851 | 1517 | 1750 | 1800 | 1534 | 2034 | 2567 | 2033 | 1967 | 1977 | 2993 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | cross-off | cross | on | cross-on | cross-on | on | on | cross-on | cross-on | cross-on | cross | cross | cross-off | cross-off | cross-off | cross-off |
High Tide | 9:01AM1.18m | 8:31PM1.43m | 10:40AM1.08m | 9:01PM1.40m | 9:44PM1.36m | 4:28PM1.26m | 11:10PM1.33m | 4:23PM1.35m | 00:59AM1.34m | 4:40PM1.42m | 2:16AM1.40m | ||||||||
Low Tide | 2:48AM0.56m | 2:13PM0.83m | 3:50AM0.55m | 2:28PM0.99m | 5:14AM0.52m | 6:50AM0.45m | 6:32PM1.25m | 8:04AM0.35m | 8:47PM1.21m | 8:59AM0.25m | 9:34PM1.12m | ||||||||
— | 4:50 | — | — | 4:50 | — | — | 4:52 | — | — | 4:52 | — | — | 4:52 | — | — | 4:54 | — | — | |
6:39 | — | 6:38 | — | — | 6:37 | — | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | |
mm | — | — | — | 1 | 1 | — | — | 2 | 1 | — | — | — | — | — | — | — | — | — | 3 |
Temp °C | 23 | 27 | 27 | 25 | 29 | 29 | 26 | 28 | 28 | 25 | 28 | 28 | 25 | 28 | 27 | 23 | 26 | 25 | 25 |
Feels °C | 22 | 27 | 28 | 28 | 31 | 31 | 30 | 30 | 30 | 28 | 30 | 30 | 28 | 27 | 26 | 22 | 25 | 23 | 25 |
Swell 1 Height (m) Direction Period (s) | SE 16 | SE 15 | SE 14 | SSE 13 | S 13 | S 13 | S 13 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 15 | SSW 16 | SW 16 | E 12 | SW 16 | ENE 11 |
8201 | 6936 | 5810 | 2809 | 2056 | 2005 | 1811 | 2041 | 1851 | 1517 | 1750 | 1800 | 1534 | 2034 | 2567 | 2033 | 1424 | 1532 | 2161 | |
Swell 2 Height (m) Direction Period (s) | ENE 13 | ENE 12 | E 18 | E 10 | E 10 | ESE 10 | ESE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 10 | ESE 13 | ESE 13 | E 14 | E 14 | E 13 | SW 16 | SE 8 | SW 16 |
57 | 52 | 6 | 510 | 468 | 356 | 425 | 428 | 312 | 450 | 346 | 614 | 1104 | 1617 | 1638 | 1200 | 1685 | 3 | 1041 | |
Swell 3 Height (m) Direction Period (s) | — | ENE 18 | — | ENE 17 | ENE 16 | ENE 16 | ENE 15 | SE 9 | SSE 9 | ENE 14 | E 9 | ENE 9 | — | — | SE 15 | — | — | — | S 13 |
— | 31 | — | 27 | 25 | 51 | 46 | 21 | 216 | 41 | 42 | 28 | — | — | 37 | — | — | — | 123 | |
Wind waves Height (m) Direction Period (s) | — | ENE 11 | — | — | — | — | — | — | — | — | ESE 11 | — | — | — | — | E 5 | ENE 12 | ENE 12 | ENE 11 |
— | 451 | — | — | — | — | — | — | — | — | 423 | — | — | — | — | 57 | 1967 | 1977 | 2993 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 63 | 63 | 29 | 18 | 22 | 30 | 29 | 48 | 81 | 29 | 29 | 30 | 29 | 29 | 95 | 1075 | 1075 | 1075 | 273 |
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.











