Surf Forecasts:
Big Ben surf forecast from 25 Aug 2026:
- Best quality surf: Wednesday 26 Aug, 9AM (local time) - 3ft (0.9m), 12s period, SSW swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 3AM (local time) - 5.5ft (1.7m), 13s period, SSW swell with 1,011 kJ wave energy.
- Next surfable swell (1★+): Wednesday 26 Aug, 9AM (local time) - 3ft (0.9m), 12s period with SSW 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 Wednesday (Aug 26) at 9AM. The primary swell is predicted to be 0.9m and 12s period with a secondary swell of 0.9m and 9s. Another secondary swell of 0.8m and 5s is also forecast. 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 1.7m 13s and forecast to arrive on Wednesday (Sep 02) 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 1.3m 5s period and expected on Thursday (Aug 27) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Wed 26th Aug) | 3ft (0.9m) 12s |
| Best Surf | 9AM (Wed 26th Aug) | 3ft (0.9m) 12s |
| Most Powerful | 3AM (Wed 2nd Sep) | 5.5ft (1.7m) 13s |
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's on the menu for the next couple of weeks at Big Ben.
Overall, it's a mixed bag. We've got a decent run of clean, small waves kicking things off, but then a big, messy, and eventually oversized swell moves in for the second week that’s really only for the brave or the kite crew. The first week is where the real surf is.
We start off on Wednesday the 26th of August with a clean morning. The swell is a modest 3 ft from the SSW with a 12-second period, feeling pretty weak but delivering a decent amount of energy. The wind is a light cross-off, and the water temp is about average for the time of year. It’s not big, but it looks fun and clean. The afternoon gets a bit choppy with a stronger cross-breeze, so get out early.
Thursday the 27th has a couple of nice windows. The morning is a bit sketchy with a risk of storms, but the WSW wind is cross-off, keeping the 2 ft S swell clean. The afternoon actually looks better: a 3 ft SSW swell with a light cross-off breeze from the NNE. That’s a solid window for a small-wave session.
Friday the 28th is another clean morning, with a 3 ft easterly swell and light winds. The afternoon fades a bit into marginal territory.
Saturday the 29th and Sunday the 30th are pretty ordinary. Saturday is blown out by a cross-shore wind, and the swell drops to 2 ft. Sunday is glassy but tiny, with only 2 ft of weak E swell. You could probably find a longboard wave, but it’s flat by any standard.
The first week has a couple of subtle highlights. The best of the bunch is likely Wednesday morning the 26th. The swell is clean, the 3 ft SSW swell is well-directed for this beach/jetty setup, and with a cross-off wind, it’s the most user-friendly wave of the week. The morning of Thursday the 27th is also a standout for the same reasons, just a touch smaller. Keep in mind the crowds are possible here, so get in early.
Heading into the second week, things get weird. Monday the 31st of August has a small, clean 1 ft swell with a very long 15-second period. That long period will make it a bit fat and straight on a beach setup, but it’s sparkly. Tuesday the 1st of September sees a bump in size to 4-4 ft, but the wind goes junk, making it a marginal call.
Then from Wednesday the 2nd of September, the swell pumps up. On the 2nd, we see 7 ft SSW swell but with a strong cross-onshore wind, making it choppy and messy. The energy is huge, but the quality is poor. This pattern continues into the 3rd and 4th with 6 ft to 4 ft swells, but the wind is always on it. Honestly, this setup over 5 ft with onshore wind looks more interesting for kite surfing than paddle surfing.
The real bomb hits on Monday the 7th and Tuesday the 8th of September. The swell builds to 10 ft, then 15 ft from the SSE with a very long 14-second period. The energy readings are massive. The file says the break is too big. This is expert-only territory, and even then, the wind is cross-onshore, so it’s going to be a washing machine. The swell direction is also a bit off for this break’s optimum.
By the 9th and 10th, the swell drops back to 7 ft and then 4 ft, but the wind is still strong and cross-shore, keeping things messy. There’s a promising but less certain window on Saturday the 5th of September with a clean 2 ft to 3 ft swell and light cross-off winds, but it’s a long way out.
So, to sum it up: the first few days are your best bet for clean, fun waves. The second week is a write-off for the average surfer.
Rusty.
Short Range ForecastModerate rain (total 14mm), heaviest on Thu morning. Warm (max 30°C on Wed morning, min 24°C on Thu afternoon). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Sun night. Warm (max 26°C on Sat morning, min 23°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Wednesday 26 | Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | ||||||||||||||
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 11 | SSW 12 | SSW 12 | SW 11 | SW 11 | SSW 11 | E 13 | E 12 | E 12 | E 12 | E 12 | E 11 | E 11 | E 11 | E 12 | E 11 | SSW 15 | S 14 | SSW 12 |
Wave Graph | |||||||||||||||||||
326 | 233 | 196 | 439 | 88 | 240 | 212 | 193 | 139 | 137 | 98 | 93 | 63 | 94 | 98 | 62 | 73 | 100 | 115 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross-off | cross | cross | cross-off | cross-off | cross-on | cross-off | cross-off | glassy | cross | cross | cross-off | glassy | glassy | cross | cross-off | cross-off | cross-off |
High Tide | 2:51AM1.43m | 4:50PM1.50m | 3:40AM1.52m | 5:08PM1.52m | 4:23AM1.58m | 5:27PM1.54m | 5:03AM1.61m | 5:47PM1.54m | 5:42AM1.60m | 6:06PM1.55m | 6:21AM1.55m | 6:26PM1.55m | |||||||
Low Tide | 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 | 11:57AM0.41m | 00:11AM0.46m | 12:23PM0.54m | 00:45AM0.42m | ||||||
— | 5:05 | — | — | 5:07 | — | — | 5:07 | — | — | 5:09 | — | — | 5:09 | — | — | 5:09 | — | — | |
6:16 | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — | — | 6:09 | — | — | 6:08 | — | |
mm | — | — | — | — | 8 | 2 | 2 | 2 | — | 1 | — | — | — | — | — | 3 | 2 | — | — |
Temp °C | 27 | 30 | 29 | 27 | 27 | 24 | 26 | 27 | 28 | 25 | 26 | 26 | 25 | 26 | 26 | 24 | 23 | 24 | 23 |
Feels °C | 28 | 32 | 30 | 29 | 30 | 26 | 29 | 29 | 30 | 30 | 27 | 27 | 27 | 30 | 30 | 25 | 25 | 26 | 26 |
Swell 1 Height (m) Direction Period (s) | S 11 | SSW 12 | SSE 9 | SSE 9 | SSE 10 | SSW 11 | E 13 | E 12 | E 12 | E 12 | E 12 | E 11 | E 11 | E 11 | E 12 | E 11 | E 11 | E 11 | SSW 12 |
326 | 233 | 121 | 92 | 72 | 240 | 212 | 193 | 139 | 137 | 98 | 93 | 63 | 94 | 98 | 62 | 62 | 86 | 115 | |
Swell 2 Height (m) Direction Period (s) | SSW 12 | SSE 9 | SSW 12 | E 12 | SW 11 | E 13 | S 10 | S 9 | S 8 | SW 6 | S 8 | SSW 8 | SE 10 | E 5 | SSW 6 | SSW 6 | SSW 6 | S 14 | E 11 |
208 | 121 | 196 | 134 | 71 | 173 | 118 | 38 | 47 | 31 | 18 | 20 | 27 | 11 | 12 | 13 | 12 | 100 | 91 | |
Swell 3 Height (m) Direction Period (s) | E 13 | E 12 | E 12 | S 12 | S 11 | E 10 | SW 10 | SSE 10 | SE 10 | S 8 | SSE 11 | SE 11 | SSW 8 | SE 10 | SE 10 | SE 10 | SSW 15 | SSW 10 | S 10 |
215 | 148 | 138 | 72 | 88 | 50 | 35 | 36 | 23 | 21 | 47 | 31 | 11 | 26 | 27 | 28 | 73 | 33 | 46 | |
Wind waves Height (m) Direction Period (s) | SW 5 | SW 5 | SW 5 | SW 11 | SW 5 | NE 4 | SW 6 | SW 6 | SW 6 | SW 6 | NNE 3 | ENE 5 | ENE 5 | — | SSW 5 | NE 3 | NE 5 | ENE 5 | — |
66 | 35 | 42 | 439 | 57 | 4 | 11 | 96 | 62 | 61 | 1 | 25 | 47 | — | 36 | 3 | 11 | 19 | — | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 35 | 0 | 70 | 35 | 0 | 0 | 30 | 0 | 20 | 0 | 35 | 35 | 0 | 0 | 0 | 534 | 0 | 0 | 0 |
Best forecast wave conditions in Chiba | |||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||
Header Global | |||||||||||||||||||
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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.











