Surf Forecasts:
Big Ben surf forecast from 4 Sep 2026:
- Best quality surf: Monday 7 Sep, 3PM (local time) - 11ft (3.5m), 11s period, S swell with cross-shore winds.
- Most powerful swell: Monday 7 Sep, 12PM (local time) - 13ft (4.0m), 11s period, SSE swell with 3,882 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 3PM (local time) - 11ft (3.5m), 11s period with S 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 Monday (Sep 07) at 3PM. The primary swell is predicted to be 3.5m and 11s period with a secondary swell of 1.5m and 8s. The wind is predicted to be cross-shore as the swell arrives.
The most powerful waves expected at Big Ben in the next 16 days are 4.0m 11s and forecast to arrive on Monday (Sep 07) at 12PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.9m 4s period and expected on Wednesday (Sep 09) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Mon 7th Sep) | 11ft (3.5m) 11s |
| Best Surf | 3PM (Mon 7th Sep) | 11ft (3.5m) 11s |
| Most Powerful | 12PM (Mon 7th Sep) | 13ft (4.0m) 11s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s talk about what’s on the cards for Big Ben.
Look, to be honest, the next couple of weeks are a real mixed bag and most of the time, you’re better off waiting. The first proper chance to get wet isn’t until Friday the 4th of September in the afternoon, but it’s pretty weak. We've got some small 2ft swell from the SSW with a moderate 214 combined energy. The wind is a cross-shore, so it's going to be a bit bumpy. It’s semi-rideable for a beginner but nothing to write home about. The water is a warm 83°, which is a touch warmer than normal for this time of year.
The whole weekend and Monday the 7th are a write-off. The swell gets bigger, but the wind is all over the place and onshore, churning up the water. The wave energy climbs to over 2000, but with those wind states, it’s just a messy, ugly mess.
Now, keep your eyes peeled for Monday afternoon the 7th and Tuesday the 8th of September. The swell is massive, over 10ft from the south, with massive energy readings over 3000. But here’s the catch—it’s predicted to be too big for this break. However, we get a window on Tuesday afternoon (8th September) that stands out. The wind goes glassy, absolutely dead calm, for the afternoon, and the swell settles to a still big 8ft from the south. This is expert territory only—it's too big for beginners and it will be heavy. If you are a seasoned charger, that is your standout window. It’s the only time you’ll get a proper, clean wave at Big Ben in this whole forecast.
The rest of the fortnight is mostly small, weak, and messy. There is a return of some clean, glassy conditions on Saturday the 12th of September in the morning, with a very long-period 3ft groundswell from the east (14 seconds). The energy is low at 378, but the glassy wind makes it ridable. It’s a small wave day, but it will be pretty. After that, it’s back to marginal, cross-shore chop and weak swell for days on end.
Best on offer: Tuesday afternoon (8th September) for pure size and clean conditions, exclusively for experts. A distant second is Saturday morning (12th September) for a clean, small-wave fun session.
Rusty.
Short Range ForecastHeavy rain (total 209mm), heaviest during Sun night. Warm (max 28°C on Mon morning, min 22°C on Fri night). Winds increasing (light winds from the NE on Fri afternoon, fresh winds from the ESE by Sun night). | Days 5-7 Weather SummaryHeavy rain (total 75mm), heaviest during Wed afternoon. Warm (max 28°C on Mon afternoon, min 20°C on Thu morning). Winds decreasing (fresh winds from the SSW on Mon afternoon, calm by Tue afternoon). | |||||||||||||||||||
Fri 4 | Saturday 5 | Sunday 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | ||||||||||||||
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) | SSW 10 | SSW 9 | E 6 | E 7 | E 6 | ENE 7 | ENE 7 | E 8 | S 10 | S 11 | S 11 | S 10 | S 10 | S 10 | SSW 10 | S 10 | S 9 | ENE 7 | ENE 7 | ENE 7 |
Wave Graph  | ||||||||||||||||||||
 kJ | 75 | 65 | 225 | 200 | 160 | 385 | 503 | 858 | 1527 | 2935 | 2759 | 1849 | 1316 | 1403 | 2021 | 1041 | 480 | 247 | 319 | 237 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross-on | cross | cross-off | cross | cross | on | cross-on | cross | cross | cross | glassy | cross | off | cross-off | cross-off | cross | cross | cross-off |
High Tide | 7:48PM1.43m | 8:08PM1.35m | 3:59PM1.32m | 10:09PM1.26m | 3:49PM1.38m | 1:09AM1.28m | 4:00PM1.44m | 2:25AM1.38m | 4:17PM1.48m | 3:18AM1.48m | 4:35PM1.51m | |||||||||
Low Tide | 4:21AM0.52m | 6:15AM0.51m | 8:43PM1.26m | 7:44AM0.44m | 8:59PM1.14m | 8:40AM0.37m | 9:23PM1.01m | 9:23AM0.31m | 9:48PM0.87m | 9:59AM0.30m | 10:15PM0.72m | |||||||||
 |  |  | |  | |  |  | | | | | | | | | |  | | | |
 | — | — | 5:13 | — | — | 5:13 | — | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — | 5:16 | — | — |
 | 6:02 | — | — | 6:01 | — | — | 6:00 | — | — | 5:59 | — | — | 5:57 | — | — | 5:55 | — | — | 5:54 | — |
mm | 1 | 23 | 7 | 6 | 3 | 7 | 20 | 110 | 32 | 5 | 8 | 6 | 4 | 12 | 16 | 18 | 1 | 5 | 5 | 16 |
Temp °C | 26 | 24 | 23 | 22 | 23 | 23 | 23 | 26 | 28 | 28 | 27 | 28 | 26 | 26 | 23 | 23 | 23 | 22 | 20 | 20 |
Feels °C | 28 | 26 | 24 | 21 | 22 | 20 | 23 | 25 | 29 | 29 | 28 | 32 | 32 | 28 | 26 | 24 | 23 | 21 | 18 | 19 |
Swell 1 Height (m) Direction Period (s) | SE 6 | SSW 9 | SSW 10 | SSW 10 | SW 10 | SSE 8 | SSE 8 | S 11 | ESE 8 | E 8 | S 11 | S 10 | S 10 | ENE 9 | S 9 | S 10 | S 9 | S 9 | S 9 | S 8 |
| kJ | 47 | 65 | 83 | 61 | 33 | 13 | 44 | 338 | 381 | 319 | 2355 | 1461 | 1316 | 28 | 896 | 1041 | 480 | 229 | 145 | 84 |
Swell 2 Height (m) Direction Period (s) | SSW 10 | E 9 | SE 9 | SE 9 | SSW 8 | SW 9 | ESE 11 | — | ENE 9 | — | ENE 9 | E 9 | E 9 | E 18 | SSW 10 | E 16 | E 16 | E 15 | E 14 | E 14 |
| kJ | 75 | 58 | 12 | 12 | 13 | 13 | 13 | — | 349 | — | 135 | 57 | 41 | 25 | 310 | 46 | 43 | 68 | 65 | 100 |
Swell 3 Height (m) Direction Period (s) | E 9 | SE 6 | ENE 13 | ENE 13 | ENE 12 | SSW 9 | SW 9 | — | — | — | — | E 16 | E 19 | SE 12 | E 9 | E 9 | ESE 11 | SE 11 | ESE 11 | SE 10 |
| kJ | 58 | 20 | 17 | 17 | 14 | 8 | 3 | — | — | — | — | 5 | 7 | 6 | 15 | 14 | 11 | 30 | 11 | 16 |
Wind waves Height (m) Direction Period (s) | ESE 6 | ENE 4 | E 6 | E 7 | E 6 | ENE 7 | ENE 7 | E 8 | S 10 | S 11 | S 11 | S 10 | — | S 10 | SSW 10 | NE 4 | ENE 6 | ENE 7 | ENE 7 | ENE 7 |
| kJ | 34 | 8 | 225 | 200 | 160 | 385 | 503 | 858 | 1527 | 2935 | 2759 | 1849 | — | 1403 | 2021 | 27 | 120 | 247 | 319 | 237 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 6 | 29 | 184 | 35 | 513 | 595 | 595 | 595 | 66 | 177 | 70 | 29 | 0 | 6 | 18 | 22 | 29 | 29 | 530 | 63 |
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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