Surf Forecasts:
Big Ben surf forecast from 23 Aug 2026:
- Best quality surf: Monday 24 Aug, 3AM (local time) - 3ft (0.9m), 12s period, SSE swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 3PM (local time) - 6.5ft (2.0m), 16s period, SSE swell with 1,982 kJ wave energy.
- Next surfable swell (1★+): Sunday 23 Aug, 9PM (local time) - 2.5ft (0.8m), 12s period with SSE 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 9PM. The primary swell is predicted to be 0.8m and 12s period with a secondary swell of 0.7m 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 2.0m 16s and forecast to arrive on Monday (Aug 24) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 5s period and expected on Wednesday (Aug 26) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sun 23rd Aug) | 2.5ft (0.8m) 12s |
| Best Surf | 3AM (Mon 24th Aug) | 3ft (0.9m) 12s |
| Most Powerful | 3PM (Mon 24th Aug) | 6.5ft (2.0m) 16s |
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 16-day window for Big Ben, but honestly, it’s a slow start and a bit of a mixed bag.
Right off the bat, the first few days are a tough watch. Sunday the 23rd kicks off with tiny 2ft SSE swell at 13 seconds. The wind is cross-on, and the water is sitting at 82°, about average for this time of year. The energy is weak (278) and it’s just not doing anything. Monday the 24th looks a bit more promising, but still not great. The morning has a cleaner 3ft SSE groundswell with a very long 18-second period. That’s a lot of energy (1463), and the wind is light and cross-shore, so it’s rideable. The long period means it’ll have some punch, but at a beach/jetty setup, it might be a bit straight and tricky. The afternoon picks up to 7ft, but the wind gets stronger and cross-shore, making it a messy cross-chop. That size is starting to push it for beginners.
The real standout, and the only time I’d get excited, is on Monday the 24th morning. The swell is 3ft from the SSE, period is a very long 18 seconds, and the energy is strong (1463). The wind is light and cross-shore, keeping it clean. It’s the best combo of size and clean conditions in the whole forecast. It’s not huge, but it’s the pick of the litter. The crowd can be an issue here sometimes, so get in early.
The rest of the week is a grind. Tuesday the 25th sees 6-6ft of swell, but it’s blown out by strong cross-shore winds. Wednesday the 26th morning has a cleaner 3ft with cross-offshore wind, but the energy is lower (457). Thursday the 27th morning has a brief window of clean 2ft from the east with cross-offshore winds, but it’s tiny. From Friday the 28th through to the end of the month, it’s a flat spell with poor to non-existent surf. The energy drops to under 300, and the wind is mostly cross or onshore. There’s a glassy 2ft on the morning of the 30th, but it’s barely surfable. Expect a gap of several days with nothing worthwhile.
Heading into September, there’s a flicker of hope. Wednesday the 2nd of September shows a pulse of 7ft SE swell, but it’s short period (9 seconds) and cross-on, so it’ll be lumpy and messy. That’s a lot of energy (1149), but the quality is poor. Thursday the 3rd is 5ft SSW groundswell, but again, cross-shore wind puts a chop on it. For a few days around the 4th and 5th, we get clean 4ft SSW groundswell with cross-offshore winds, and the energy is moderate (878-875). That’s actually a decent run – clean, solid waist-to-chest high waves. It’s a promising call, but it’s over a week out, so keep your fingers crossed. By the 6th and 7th, it’s back to howling onshore winds and storms, so that’s a write-off.
To be honest, if you’re a beginner, anything over 5ft is going to be challenging, and the 7ft on the 2nd is just for the experienced crew. For the rest of us, focus on Monday the 24th morning for the best clean conditions, and keep an eye on those September 4th and 5th mornings for a promising, cleaner groundswell. It’s not a classic run, but there are a few windows.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Mon morning, min 24°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 31mm), heaviest during Thu night. Warm (max 29°C on Wed afternoon, min 21°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Sun 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | ||||||||||||||
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) | SSE 13 | SSE 13 | SSE 14 | SSE 16 | SSE 13 | SSE 13 | S 12 | S 12 | SSW 12 | SSW 12 | SSW 12 | E 14 | S 10 | E 13 | E 12 | E 12 | E 12 | E 11 | E 12 | E 12 |
Wave Graph | ||||||||||||||||||||
106 | 209 | 670 | 1982 | 968 | 980 | 926 | 520 | 175 | 344 | 177 | 102 | 198 | 212 | 193 | 139 | 132 | 121 | 132 | 101 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | glassy | cross | cross | cross | cross | cross | cross | cross-off | cross | cross-off | cross-off | cross | cross-off | cross | cross | cross-off | cross | cross-on | cross-off |
High Tide | 4:10PM1.33m | 00:01AM1.29m | 4:16PM1.41m | 1:46AM1.34m | 4:31PM1.46m | 2:51AM1.43m | 4:50PM1.50m | 3:40AM1.52m | 5:08PM1.52m | 4:23AM1.58m | 5:27PM1.54m | 5:03AM1.61m | 5:47PM1.54m | |||||||
Low Tide | 8:35PM1.23m | 8:26AM0.35m | 9:17PM1.13m | 9:13AM0.27m | 9:46PM1.02m | 9:53AM0.22m | 10:14PM0.89m | 10:28AM0.21m | 10:42PM0.76m | 10:59AM0.24m | 11:10PM0.64m | 11:29AM0.31m | 11:40PM0.54m | |||||||
— | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | |
6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 5 | 8 | 16 | — | — | — | 2 | — | — |
Temp °C | 27 | 25 | 29 | 29 | 26 | 29 | 29 | 26 | 29 | 29 | 27 | 27 | 26 | 23 | 27 | 27 | 25 | 27 | 27 | 24 |
Feels °C | 30 | 30 | 31 | 30 | 29 | 30 | 30 | 26 | 31 | 30 | 29 | 30 | 29 | 25 | 28 | 28 | 28 | 30 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | ENE 9 | SSE 13 | SSE 14 | SSE 16 | SSE 13 | SSE 13 | S 12 | S 12 | SSE 9 | SSW 12 | SSW 12 | SW 11 | S 10 | S 9 | E 12 | E 12 | SSW 8 | E 11 | E 12 | E 12 |
88 | 209 | 621 | 1982 | 968 | 980 | 926 | 520 | 136 | 344 | 177 | 96 | 198 | 106 | 193 | 139 | 67 | 121 | 132 | 101 | |
Swell 2 Height (m) Direction Period (s) | ESE 12 | E 12 | SSE 18 | E 12 | S 15 | S 15 | E 13 | E 13 | S 11 | SSE 9 | SSE 9 | E 14 | E 13 | E 13 | S 9 | SSE 10 | E 12 | S 6 | SW 9 | SSE 10 |
83 | 104 | 670 | 175 | 894 | 446 | 225 | 215 | 146 | 119 | 116 | 102 | 128 | 212 | 99 | 36 | 132 | 25 | 39 | 41 | |
Swell 3 Height (m) Direction Period (s) | SSE 13 | E 9 | E 12 | SSW 8 | E 11 | E 14 | — | SSW 13 | SSW 12 | E 12 | E 12 | E 11 | SW 11 | SW 11 | SSE 10 | SW 10 | SSE 10 | SSE 11 | SSE 11 | SW 9 |
106 | 59 | 172 | 7 | 114 | 311 | — | 187 | 175 | 141 | 98 | 58 | 90 | 55 | 37 | 14 | 37 | 47 | 47 | 28 | |
Wind waves Height (m) Direction Period (s) | NE 3 | — | — | SW 9 | SW 4 | SW 4 | SW 4 | SW 5 | SW 4 | SW 4 | SW 5 | SSW 6 | NE 4 | S 9 | SW 5 | SSW 8 | SW 5 | NNE 3 | NE 5 | NE 5 |
1 | — | — | 41 | 13 | 23 | 29 | 53 | 24 | 31 | 45 | 74 | 13 | 168 | 25 | 92 | 33 | 7 | 33 | 14 | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 22 | 0 | 30 | 35 | 70 | 70 | 229 | 81 | 35 | 561 | 0 | 0 | 6 | 0 | 121 | 90 | 0 | 6 | 29 | 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.











