Surf Forecasts:
Big Ben surf forecast from 20 Aug 2026:
- Best quality surf: Monday 24 Aug, 3AM (local time) - 2.5ft (0.7m), 20s period, SSE swell with glassy winds.
- Most powerful swell: Monday 24 Aug, 3PM (local time) - 8ft (2.4m), 16s period, SSE swell with 2,793 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 9PM (local time) - 3.5ft (1.0m), 10s period with E 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 Saturday (Aug 22) at 9PM. The primary swell is predicted to be 1.0m and 10s period with a secondary swell of 0.4m 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 2.4m 16s and forecast to arrive on Monday (Aug 24) 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 0.4m 3s period and expected on Sunday (Aug 23) at 3AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Sat 22nd Aug) | 3.5ft (1.0m) 10s |
| Best Surf | 3AM (Mon 24th Aug) | 2.5ft (0.7m) 20s |
| Most Powerful | 3PM (Mon 24th Aug) | 8ft (2.4m) 16s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, Rusty again. Let's put this in feet and miles per hour.
The first few days are a total bust. Poor surf, small weak swell, and cross-shore rubbish. The combined energy is barely over 100 (very weak). Don't bother paddling out.
The real action kicks off Monday, August 24th. The morning is the pick of the entire forecast. We've got a clean 5ft groundswell from the SSE with a very long period of 18 seconds. The wind is glassy, dead calm, and the conditions are excellent for experienced surfers. The energy is a massive 2503 (strong). Water temp is 80°, pretty average for the season. This is the one to lock in. That long period means waves will be more powerful but with longer lulls between sets.
Tuesday the 25th brings 8ft from the south, but with cross-shore winds and a bit of chop. It's got plenty of energy (2977), but it's not as clean. Wednesday the 26th is down to 6ft, still with cross-shore breeze. Better for the die-hards.
There's a lull for a few days, then Sunday, August 30th delivers again. The morning is glassy with a 4ft SSE swell and very good conditions. Wind is dead calm. The energy is a moderate 685. The afternoon holds up with 5ft and glassy conditions. A solid day for a long session.
The start of September gets wild. The 2nd brings 8ft to 10ft from the east, but cross-onshore winds mess it up. Then September 3rd is a beast: a 33ft swell from the ESE with an 18-second period. The energy reading is an insane 112,886 (very strong). The wind is glassy, but this is a life-threatening swell. Only for the absolute elite. September 4th is still gigantic at 21ft, but with clean cross-offshore winds, making it slightly more manageable for the very brave.
The run ends with a messy 7ft on the 5th of September.
Rusty out.
Short Range ForecastLight rain (total 3mm), mostly falling on Sat afternoon. Warm (max 28°C on Fri morning, min 23°C on Sun night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 29°C on Wed afternoon, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | |||||||||||||||
AM | 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) | SE 11 | E 10 | E 10 | E 10 | E 11 | E 10 | E 10 | ENE 9 | SSE 13 | SSE 18 | SSE 16 | SSE 14 | S 14 | S 14 | S 13 | SSW 13 | SSW 12 | SSE 9 | SSW 12 | SSW 11 | E 13 |
Wave Graph  | |||||||||||||||||||||
 kJ | 58 | 65 | 66 | 175 | 231 | 198 | 120 | 121 | 269 | 1518 | 2793 | 1859 | 2651 | 2436 | 1736 | 1041 | 412 | 206 | 285 | 334 | 281 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-on | cross | cross | cross | glassy | cross | cross-on | cross | glassy | cross-on | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross |
High Tide | 8:37PM1.39m | 9:26PM1.33m | 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 | ||||||||||
Low Tide | 5:40AM0.51m | 7:19AM0.44m | 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 | ||||||||||
 | |  | |  |  | | | |  | | | | |  | | | | |  |  | |
 | 5:03 | — | — | 5:03 | — | — | 5:03 | — | — | 5:05 | — | — | 5:05 | — | — | 5:05 | — | — | 5:07 | — | — |
 | — | 6:22 | — | — | 6:20 | — | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — |
mm | — | — | — | — | 1 | 2 | — | — | — | — | — | — | — | — | — | — | — | — | 2 | 2 | 11 |
Temp °C | 28 | 28 | 26 | 28 | 28 | 25 | 27 | 26 | 24 | 28 | 28 | 25 | 28 | 28 | 26 | 28 | 29 | 26 | 26 | 25 | 25 |
Feels °C | 30 | 30 | 28 | 30 | 31 | 30 | 29 | 28 | 27 | 31 | 30 | 28 | 30 | 30 | 28 | 30 | 31 | 28 | 28 | 26 | 24 |
Swell 1 Height (m) Direction Period (s) | SSW 9 | E 10 | E 10 | E 10 | E 11 | E 10 | E 10 | ENE 9 | SSE 13 | SSE 18 | SSE 16 | SSE 14 | S 14 | S 14 | S 13 | SSW 13 | SSE 9 | SSE 9 | SSW 12 | SSW 11 | SSE 7 |
| kJ | 45 | 65 | 66 | 175 | 231 | 198 | 120 | 121 | 269 | 1518 | 2793 | 1859 | 2651 | 2436 | 1736 | 1041 | 254 | 206 | 285 | 334 | 102 |
Swell 2 Height (m) Direction Period (s) | SE 11 | SSW 9 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | SSW 9 | ESE 12 | ENE 9 | SSE 14 | E 12 | S 16 | E 14 | E 13 | E 13 | SSE 9 | SSW 12 | SSW 11 | E 15 | SSE 10 | E 13 |
| kJ | 58 | 44 | 52 | 47 | 46 | 65 | 44 | 83 | 64 | 886 | 175 | 513 | 311 | 284 | 215 | 136 | 412 | 180 | 209 | 200 | 281 |
Swell 3 Height (m) Direction Period (s) | ENE 8 | SE 11 | ESE 11 | SE 10 | SE 10 | SE 11 | SE 11 | SE 13 | E 12 | E 12 | SW 10 | S 18 | SW 10 | SW 10 | SE 10 | E 12 | E 12 | E 12 | E 11 | E 14 | SSW 10 |
| kJ | 21 | 30 | 47 | 16 | 28 | 29 | 29 | 78 | 106 | 99 | 33 | 657 | 15 | 15 | 48 | 190 | 141 | 97 | 83 | 232 | 182 |
Wind waves Height (m) Direction Period (s) | SSE 5 | SSW 3 | S 4 | S 5 | S 5 | — | NE 3 | NE 5 | — | — | — | SSW 11 | — | — | — | SSE 9 | — | — | SSE 8 | — | — |
| kJ | 9 | 3 | 13 | 22 | 23 | — | 2 | 15 | — | — | — | 75 | — | — | — | 227 | — | — | 202 | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 39 | 30 | 39 | 35 | 30 | 0 | 6 | 35 | 6 | 0 | 30 | 30 | 70 | 534 | 81 | 70 | 112 | 30 | 81 | 1273 | 534 |
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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