
Surf Forecasts:
Big Ben surf forecast from 6 Sep 2026:
- Best quality surf: Monday 7 Sep, 6PM (local time) - 11ft (3.5m), 9s period, S swell with cross-shore winds.
- Most powerful swell: Monday 7 Sep, 3PM (local time) - 11ft (3.5m), 9s period, S swell with 2,004 kJ wave energy.
- Next surfable swell (1★+): Monday 7 Sep, 6PM (local time) - 11ft (3.5m), 9s 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 6PM. The primary swell is predicted to be 3.5m and 9s period with a secondary swell of 3.0m and 9s. Another secondary swell of 1.2m and 8s is also forecast. 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 3.5m 9s and forecast to arrive on Monday (Sep 07) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.4m 6s period and expected on Wednesday (Sep 09) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 7th Sep) | 11ft (3.5m) 9s |
| Best Surf | 6PM (Mon 7th Sep) | 11ft (3.5m) 9s |
| Most Powerful | 3PM (Mon 7th Sep) | 11ft (3.5m) 9s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s have a look at what Big Ben has in store for us over the next couple of weeks. I’ll be straight with you – it’s a bit of a rough start, but we’ve got a couple of windows that might just be worth a paddle.
The forecast kicks off with a messy and energetic system. We’re seeing a big pulse of swell from the 6th of September, but it comes with a heap of rain and strong cross-onshore winds. The water temp is sitting at 83°, which is a touch warmer than normal for this time of year, so at least you won’t need a thick suit. That first few days, from Sunday the 6th right through Monday the 7th, the swell is pushing 10 ft to 12 ft from the E and S, with a combined energy reading of 906 to 2256. That’s a lot of power, but with 19 to 22 mph cross-onshore winds and heavy rain, it’s a write-off for paddling. Honestly, with that kind of size and strong onshore wind at a beach/jetty setup, this looks more like a kite surfer’s playground than a surfer’s.
By Tuesday the 8th, things ease back a touch. The swell drops to 7 ft from the S, with period around 9 seconds, and the wind swings cross-shore at a lighter 9 to 12 mph. The energy is still moderate at 827-934. The conditions are still marginal, though – there’s a bit of chop on the water. This trend continues into Wednesday the 9th, with 8 ft to 10 ft SSW swell, but the wind stays fresh and cross-shore, keeping things lumpy.
Now, here’s where it gets interesting. Thursday the 10th looks like our first real window. The swell has dropped to a cleaner 4 ft in the morning and 3 ft in the afternoon, from the S, with a period of 8 seconds. The wind turns light cross-offshore from the NNE at 9 mph, and the wave comment calls it "clean". The combined energy is 402 in the morning, dropping to 294 in the afternoon. It’s not a huge swell, but for a beginner-friendly spot like Big Ben, that’s actually a decent size, and clean conditions make it the standout of the whole run. The crowd factor says "sometimes" here, so you might share it with a few others, but it’s worth the paddle.
After that, we hit a long, flat spell. From Friday the 11th all the way through to Saturday the 19th of September, the swell stays tiny – mostly under 3 ft, with periods that drop from 14 seconds down to 9 seconds. The wind is often cross or onshore, and the wave comments are consistently "poor surf conditions" or "marginal". That’s a solid nine days of mostly nothing to get excited about. The energy readings are weak to moderate, dropping as low as 103. There are a few moments, like Friday morning the 11th with a clean 2 ft easterly groundswell (14-second period) and light offshore wind, but the swell is just too small to hold up. That long period at a beach/jetty will also mean it breaks pretty straight.
Towards the very end of the run, on Sunday the 20th of September, we see a tiny uptick. The swell is still only 2 ft from the E, with a period of 9 seconds, but the wind goes glassy in the afternoon. The combined energy is down to 90, so it’s weak, but for a sunrise or late afternoon session on a longboard, it could be a fun little skeg-dunker.
In short: the best bet is Thursday the 10th of September for cleaner, smaller waves. The rest of the period is mostly a write-off, with a long gap of flatness from the 11th through the 19th. Keep an eye on the forecasts – it tends not to stay this quiet forever.
Rusty.
Short Range ForecastHeavy rain (total 162mm), heaviest during Sun afternoon. Warm (max 29°C on Tue afternoon, min 24°C on Sun afternoon). Winds decreasing (fresh winds from the S on Mon morning, light winds from the SW by Tue morning). | Days 5-7 Weather SummaryLight rain (total 9mm), mostly falling on Wed night. Warm (max 28°C on Wed afternoon, min 21°C on Wed night). Winds decreasing (fresh winds from the SW on Wed afternoon, calm by Fri afternoon). | |||||||||||||||||||
Sun 6 | Monday 7 | Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | ||||||||||||||
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 8 | ESE 8 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 8 | SSW 9 | SSW 9 | S 8 | S 8 | E 14 | E 14 | E 14 | E 14 | E 14 | ESE 13 | ESE 13 |
Wave Graph | ||||||||||||||||||||
892 | 1123 | 1288 | 2004 | 1021 | 707 | 509 | 548 | 935 | 1351 | 599 | 230 | 127 | 100 | 144 | 140 | 183 | 178 | 299 | 384 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | cross-on | cross | cross | cross | cross | cross | cross | off | cross-off | cross-off | cross | off | cross-on | cross | cross | cross | cross-off |
High Tide | 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 | 4:02AM1.57m | 4:53PM1.53m | 4:42AM1.62m | 5:12PM1.55m | |||||||
Low Tide | 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 | 10:31AM0.32m | 10:42PM0.59m | 11:01AM0.38m | 11:11PM0.48m | |||||||
— | — | 5:15 | — | — | 5:16 | — | — | 5:16 | — | — | 5:16 | — | — | 5:18 | — | — | 5:18 | — | — | |
6:00 | — | — | 5:59 | — | — | 5:57 | — | — | 5:55 | — | — | 5:54 | — | — | 5:52 | — | — | 5:52 | — | |
mm | 64 | 71 | 10 | 6 | 2 | 1 | — | 4 | 4 | 2 | 7 | — | — | — | — | — | — | — | — | — |
Temp °C | 24 | 26 | 27 | 27 | 27 | 28 | 29 | 27 | 29 | 28 | 25 | 21 | 22 | 23 | 26 | 26 | 23 | 24 | 24 | 23 |
Feels °C | 23 | 26 | 28 | 27 | 29 | 31 | 32 | 31 | 29 | 29 | 29 | 22 | 23 | 27 | 30 | 30 | 26 | 27 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | SW 9 | S 9 | E 8 | E 9 | S 9 | S 9 | S 9 | E 8 | E 9 | SE 11 | SSW 9 | S 8 | S 8 | ENE 6 | S 7 | E 14 | E 14 | E 14 | ESE 13 | ESE 13 |
3 | 202 | 350 | 252 | 1021 | 707 | 509 | 35 | 24 | 30 | 599 | 230 | 127 | 57 | 53 | 140 | 183 | 178 | 299 | 384 | |
Swell 2 Height (m) Direction Period (s) | NE 13 | NE 9 | ESE 11 | NNE 11 | E 8 | E 9 | E 9 | SE 10 | SE 10 | E 9 | E 16 | E 15 | E 15 | S 8 | E 14 | S 7 | SSW 7 | SSW 8 | SSW 8 | SSW 7 |
7 | 85 | 12 | 12 | 167 | 93 | 55 | 25 | 25 | 14 | 43 | 68 | 67 | 72 | 144 | 40 | 18 | 19 | 19 | 10 | |
Swell 3 Height (m) Direction Period (s) | S 14 | NE 12 | SE 11 | — | SE 10 | SE 10 | SE 10 | E 18 | E 17 | E 16 | ESE 11 | SE 11 | SE 11 | E 14 | ENE 6 | ESE 10 | SE 10 | ESE 8 | S 9 | S 13 |
4 | 23 | 19 | — | 28 | 27 | 26 | 25 | 52 | 46 | 11 | 29 | 29 | 100 | 21 | 36 | 25 | 28 | 2 | 3 | |
Wind waves Height (m) Direction Period (s) | E 8 | ESE 8 | S 9 | S 9 | — | — | SSW 9 | S 9 | S 8 | SSW 9 | NE 7 | NE 6 | ENE 6 | — | — | — | NE 5 | NE 4 | NE 5 | ENE 6 |
892 | 1123 | 1288 | 2004 | — | — | 344 | 548 | 935 | 1351 | 217 | 75 | 71 | — | — | — | 17 | 29 | 23 | 31 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 532 | 530 | 177 | 70 | 35 | 2 | 30 | 70 | 177 | 70 | 0 | 22 | 0 | 6 | 0 | 24 | 6 | 6 | 35 | 0 |
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.










