
Surf Forecasts:
Big Ben surf forecast from 6 Aug 2026:
- Best quality surf: Sunday 9 Aug, 3AM (local time) - 6.5ft (2.0m), 14s period, ESE swell with glassy winds.
- Most powerful swell: Friday 7 Aug, 3AM (local time) - 7ft (2.2m), 13s period, S swell with 1,583 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 3AM (local time) - 6.5ft (2.0m), 14s period with ESE 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 09) at 3AM. The primary swell is predicted to be 2.0m and 14s period with a secondary swell of 1.1m and 11s. 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 2.2m 13s and forecast to arrive on Friday (Aug 07) at 3AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Monday (Aug 10) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3AM (Sun 9th Aug) | 6.5ft (2.0m) 14s |
| Best Surf | 3AM (Sun 9th Aug) | 6.5ft (2.0m) 14s |
| Most Powerful | 3AM (Fri 7th Aug) | 7ft (2.2m) 13s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s get into it. We’ve got a bit of a tricky run ahead for Big Ben, a beach/jetty spot that’s exposed to the swell. The next 16 days are a mixed bag, with a lot of marginal surf and less-than-ideal conditions. The best window looks like it’s going to be a stand-out early on, but you’ll have to be patient.
The first real chance to get wet kicks off on Friday, August 7th, but it’s not exactly a dream. We’ve got a 7ft S swell rolling in with a 12-second period, which gives it some decent energy (1590). The problem is the wind is on it from the SSE at 6 mph, and there’s a risk of thunderstorms. It’s a bit of a mission, but the size is there for a beginner-friendly wave. The afternoon cleans up a bit with clear skies, but the wind picks up to 9 mph from the same direction, still onshore. The water temp is about average for this time of year.
Saturday, August 8th, the swell drops to 5ft, shifting around to the SSW in the morning. It’s cleaner with a light SE breeze, but the energy is down (880). The afternoon sees a shift to an ESE swell with a longer 13-second period, pumping the energy back up to 1100, but the wind is still onshore. It’s a bit of a wait-and-see day.
Sunday, August 9th is the one to circle. The morning has a 6ft ESE swell, 13-second period, and a light cross-shore wind from the ENE at 6 mph. The energy is solid (1533), and the "light cross-shore with small crossing wind ripples" means it’s not perfect, but it’s the cleanest we’ve seen. This is the best on offer for the first week. The afternoon gets a bit choppier as the wind swings more onshore.
Monday, August 10th morning has a clean 7ft E swell, with a cross-offshore wind from the NNE at 12 mph. The energy is high (1452), and the conditions are clean. But the afternoon gets a bit messy with a cross-shore breeze.
Then we hit a rough patch. Tuesday, August 11th through Thursday, August 13th sees a lot of onshore or strong cross-offshore winds, and the swell is either too big for beginners or just not well-shaped. The 8ft ENE swell on Tuesday morning is too big for a beginner spot, and the energy is very strong (2595). By Wednesday, August 12th, the swell drops to 3ft, and the energy is weak (465). It’s a total gap in quality surf.
Thursday, August 13th and Friday, August 14th bring some size back, but the wind is either onshore or cross-off, keeping it messy. The real standout for the second week is Sunday, August 16th morning. We’ve got a 10ft E swell, 11-second period, and a light cross-shore wind from the ENE at 6 mph. The energy is massive (1936). However, the file says it’s predicted to be too big for this break. This is for experts only.
Monday, August 17th morning is even bigger, with a 10ft E swell and 19 mph cross-offshore winds. The energy is through the roof (3071), but again, it’s too big for most. The rest of that week is a mix of solid swell and strong winds, with the period dropping off. By Friday, August 21st, we get a glimmer of hope: a 3ft S swell with a 12-second period, and glassy conditions. The energy is low (398), but it’s the only "good surf conditions" call in the whole run. It’s a fun little window for the longboard or a log.
Overall, the best bet is Sunday, August 9th morning for the most consistent, clean-ish waves. The second week is for the brave and experienced, with some massive, powerful swells. If you’re a beginner, this 16-day window is a write-off, but for the pros, the 16th and 17th will be a spectacle.
Stay salty,
Rusty
Short Range ForecastLight rain (total 4mm), mostly falling on Thu night. Warm (max 29°C on Fri morning, min 24°C on Sat night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 3mm), mostly falling on Wed afternoon. Warm (max 29°C on Tue morning, min 23°C on Sun night). Mainly fresh winds. | ||||||||||||||||||
Friday 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | ||||||||||||||
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) | S 13 | S 12 | S 12 | S 11 | SSW 11 | ESE 13 | ESE 14 | ESE 13 | E 13 | E 12 | E 12 | E 11 | ENE 11 | ENE 11 | ENE 10 | ENE 10 | E 10 | E 10 | E 11 |
Wave Graph | |||||||||||||||||||
1938 | 1170 | 887 | 617 | 504 | 633 | 1360 | 1288 | 1207 | 1065 | 1204 | 1075 | 1008 | 1409 | 555 | 348 | 192 | 237 | 621 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | on | cross-on | on | on | on | cross | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross-off | cross-off | cross-off | cross-off | cross-on |
High Tide | 9:01PM1.40m | 9:44PM1.36m | 4:28PM1.26m | 11:10PM1.33m | 4:23PM1.35m | 00:59AM1.34m | 4:40PM1.42m | 2:16AM1.40m | 5:00PM1.47m | 3:13AM1.47m | 5:21PM1.50m | ||||||||
Low Tide | 5:14AM0.52m | 6:50AM0.45m | 6:32PM1.25m | 8:04AM0.35m | 8:47PM1.21m | 8:59AM0.25m | 9:34PM1.12m | 9:42AM0.17m | 10:08PM1.02m | 10:20AM0.13m | 10:38PM0.92m | ||||||||
— | 4:52 | — | — | 4:52 | — | — | 4:52 | — | — | 4:54 | — | — | 4:54 | — | — | 4:56 | — | — | |
6:37 | — | 6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | |
mm | 2 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 3 | 40 |
Temp °C | 26 | 29 | 29 | 25 | 29 | 28 | 25 | 28 | 28 | 24 | 27 | 27 | 23 | 29 | 28 | 23 | 27 | 24 | 26 |
Feels °C | 30 | 32 | 32 | 28 | 31 | 30 | 29 | 29 | 29 | 26 | 25 | 25 | 22 | 27 | 26 | 21 | 26 | 24 | 29 |
Swell 1 Height (m) Direction Period (s) | S 13 | S 12 | S 12 | S 11 | SSW 11 | ESE 13 | ESE 14 | ESE 13 | E 13 | E 12 | E 12 | E 11 | E 11 | ENE 11 | ENE 10 | ENE 10 | E 10 | E 10 | E 11 |
1938 | 1170 | 887 | 617 | 504 | 633 | 1360 | 1288 | 1207 | 1065 | 1204 | 1075 | 862 | 1027 | 555 | 348 | 192 | 237 | 621 | |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 10 | ESE 10 | ESE 9 | ESE 12 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | SSW 11 | E 14 | SSW 11 | SSW 11 | SSW 11 | SW 11 | SSW 11 | SW 11 |
425 | 378 | 370 | 293 | 330 | 422 | 303 | 245 | 222 | 117 | 128 | 119 | 243 | 90 | 91 | 93 | 189 | 160 | 121 | |
Swell 3 Height (m) Direction Period (s) | ENE 15 | ENE 15 | ENE 15 | ENE 14 | E 10 | E 10 | — | — | SW 11 | SW 12 | SW 12 | SW 11 | SSW 10 | SW 12 | SW 12 | SW 12 | NE 9 | NE 9 | NNE 9 |
46 | 42 | 43 | 41 | 46 | 45 | — | — | 217 | 124 | 120 | 101 | 80 | 69 | 69 | 71 | 84 | 43 | 52 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | ENE 11 | ENE 11 | — | — | — | — | — |
— | — | — | — | — | — | — | — | — | — | — | — | 1008 | 1409 | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 29 | 30 | 30 | 30 | 30 | 30 | 30 | 22 | 35 | 0 | 29 | 29 | 63 | 183 | 121 | 60 | 49 | 48 | 177 |
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.











