Surf Forecasts:
Big Ben surf forecast from 15 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 6AM (local time) - 3.5ft (1.0m), 8s period, E swell with cross-offshore winds.
- Most powerful swell: Saturday 15 Aug, 3PM (local time) - 5ft (1.5m), 10s period, E swell with 440 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 6AM (local time) - 3.5ft (1.0m), 8s 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 Tuesday (Aug 18) at 6AM. The primary swell is predicted to be 1.0m and 8s period with a secondary swell of 0.4m and 10s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Big Ben in the next 16 days are 1.5m 10s and forecast to arrive on Saturday (Aug 15) at 3PM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Tue 18th Aug) | 3.5ft (1.0m) 8s |
| Best Surf | 6AM (Tue 18th Aug) | 3.5ft (1.0m) 8s |
| Most Powerful | 3PM (Sat 15th Aug) | 5ft (1.5m) 10s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, grab your board and let’s have a look at what’s cooking in the water.
Honestly, for the next week and a half, things are looking pretty bleak. We’ve got a long stretch of weak, onshore slop with no real quality on the cards. It’s not until late in the forecast period, around Saturday the 30th, that we finally get a window of something worth paddling out for.
The first recommended session comes up on Saturday morning, August 30th. At Big Ben, we’ll see a solid 6 ft east swell with a very long period of 16 seconds. That kind of period means proper groundswell energy, so expect good shape and long lines, but it’ll be breaking straight at the beach. The wind is light and offshore from the ESE, which will keep the surface glassy and clean. This is easily the standout of the whole outlook. The combined swell energy is strong at 1595. Water temp is 81°, which is bang on average for this time of year, so no weird surprises there. This spot is a beginner-friendly beach and jetty setup, so it’s accessible, but don’t expect a crowded scene—just the occasional crew in the water.
The next day, Sunday the 31st, still has some pulse. Morning sees 7 ft from the east with that same long 16-second period, but the wind swings onshore from the SE, which will mess up the surface a bit. The energy is even stronger at 2129, but the quality drops. It’s more of a backup if you’re desperate.
Before that, from August 15th all the way through to the 23rd, it’s pretty much a write-off. Small waves, cross-onshore winds, and a lot of chop. Nothing worth wetting a wetsuit for. Big Ben is inconsistent at the best of times, so this kind of blank run isn’t unusual for the area.
From the 24th to the 27th, the swell cranks up big time—over 10 ft to 15 ft—but it’s way too much for this break. That’s expert-only territory and the forecast even says it’s too big. The combined energy hits 4990 to 10865, which is massive, but for a beachy, it’ll just be a washing machine. Might be more interesting for the kite crew than us paddle surfers.
So, bottom line: hold out for Saturday the 30th at Big Ben. That’s your best shot. Everything before that is a waste of wax.
Rusty
Short Range ForecastSome drizzle, heaviest during Sun morning. Warm (max 28°C on Sat morning, min 23°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummarySome drizzle, heaviest during Thu morning. Warm (max 28°C on Tue morning, min 24°C on Tue night). Wind will be generally light. | ||||||||||||||||||||
Saturday 15 | Sunday 16 | Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | |||||||||||||||
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) | E 10 | E 10 | E 10 | E 10 | E 9 | E 8 | E 9 | E 8 | E 9 | E 8 | ESE 7 | ESE 7 | E 7 | E 7 | E 8 | E 8 | E 8 | ESE 8 | ESE 8 | ESE 7 | SSW 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 510 | 440 | 379 | 268 | 264 | 205 | 215 | 177 | 150 | 90 | 96 | 108 | 107 | 102 | 124 | 144 | 206 | 266 | 196 | 140 | 136 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | cross-on | cross-on | cross-on | cross-on | on | cross-on | on | on |
High Tide | 6:22PM1.53m | 6:04AM1.56m | 6:42PM1.52m | 6:45AM1.49m | 7:03PM1.51m | 7:29AM1.39m | 7:24PM1.50m | 8:20AM1.27m | 7:46PM1.47m | 9:31AM1.15m | 8:09PM1.44m | 8:37PM1.39m | |||||||||
Low Tide | 11:57AM0.26m | 00:10AM0.61m | 12:25PM0.38m | 00:43AM0.54m | 12:52PM0.51m | 1:20AM0.50m | 1:17PM0.66m | 2:01AM0.49m | 1:39PM0.82m | 2:52AM0.50m | 1:53PM0.97m | 4:00AM0.52m | |||||||||
 |  |  |  | | |  | | | | | | | |  |  | | | | | | |
 | 4:58 | — | — | 4:58 | — | — | 5:00 | — | — | 5:00 | — | — | 5:01 | — | — | 5:01 | — | — | 5:03 | — | — |
 | — | 6:29 | — | — | 6:28 | — | — | 6:25 | — | — | 6:24 | — | — | 6:23 | — | — | 6:22 | — | — | 6:22 | — |
mm | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | — |
Temp °C | 28 | 27 | 24 | 27 | 27 | 24 | 27 | 27 | 24 | 28 | 27 | 25 | 28 | 28 | 25 | 27 | 28 | 25 | 27 | 27 | 25 |
Feels °C | 29 | 28 | 26 | 28 | 28 | 26 | 29 | 29 | 26 | 30 | 29 | 28 | 29 | 29 | 28 | 29 | 30 | 28 | 29 | 29 | 28 |
Swell 1 Height (m) Direction Period (s) | E 10 | E 10 | E 10 | E 10 | E 9 | E 8 | E 9 | E 8 | E 9 | E 8 | ESE 7 | ESE 7 | E 7 | SE 10 | E 8 | E 8 | SE 11 | ESE 8 | ESE 8 | ESE 7 | ESE 7 |
| kJ | 510 | 440 | 379 | 268 | 264 | 205 | 215 | 177 | 150 | 90 | 96 | 108 | 97 | 36 | 89 | 144 | 30 | 266 | 196 | 140 | 111 |
Swell 2 Height (m) Direction Period (s) | SSW 11 | SSW 10 | SSW 9 | SSW 9 | SSW 9 | S 8 | SSW 9 | SSW 8 | SE 11 | SE 8 | E 8 | ENE 9 | ENE 8 | ENE 9 | SE 10 | SE 11 | SSW 9 | S 8 | S 8 | S 8 | SSW 10 |
| kJ | 93 | 58 | 48 | 46 | 45 | 37 | 25 | 23 | 40 | 51 | 69 | 26 | 24 | 25 | 37 | 40 | 16 | 35 | 33 | 34 | 136 |
Swell 3 Height (m) Direction Period (s) | SSE 9 | SSE 8 | SSE 12 | ESE 9 | SE 11 | SE 11 | SE 11 | SE 11 | SSW 8 | SE 10 | SE 10 | SE 10 | SE 10 | SSE 7 | SSE 6 | SSE 6 | SSE 6 | S 13 | S 13 | SE 10 | SE 10 |
| kJ | 49 | 23 | 55 | 35 | 43 | 42 | 42 | 42 | 13 | 37 | 36 | 37 | 36 | 9 | 7 | 4 | 4 | 3 | 3 | 45 | 50 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | ENE 8 | E 7 | E 7 | E 8 | — | E 8 | — | — | — | — |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 96 | 107 | 102 | 124 | — | 206 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 48 | 81 | 22 | 29 | 81 | 29 | 30 | 30 | 35 | 22 | 29 | 22 | 35 | 29 | 22 | 35 | 29 | 29 | 29 | 30 | 30 |
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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