
Surf Forecasts:
Big Ben surf forecast from 7 Aug 2026:
- Best quality surf: Sunday 9 Aug, 12AM (local time) - 6ft (1.9m), 14s period, ESE swell with glassy winds.
- Most powerful swell: Friday 14 Aug, 6PM (local time) - 8ft (2.5m), 12s period, ENE swell with 1,977 kJ wave energy.
- Next surfable swell (1★+): Sunday 9 Aug, 12AM (local time) - 6ft (1.9m), 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 12AM. The primary swell is predicted to be 1.9m 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 2.5m 12s and forecast to arrive on Friday (Aug 14) at 6PM. 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 Monday (Aug 10) at 12PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12AM (Sun 9th Aug) | 6ft (1.9m) 14s |
| Best Surf | 12AM (Sun 9th Aug) | 6ft (1.9m) 14s |
| Most Powerful | 6PM (Fri 14th Aug) | 8ft (2.5m) 12s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, Rusty here, checking the waves at Big Ben for the next couple of weeks. It’s a beach and jetty setup, exposed to the swell, but it’s an inconsistent spot, so you gotta wait for the right moment. Water temp is 79°, which is normal for this time of year.
We start Friday, August 7th, and it’s not looking good. A 6ft swell from the south, but the wind is a cross-on 12 mph from the SSE, making it choppy. The energy is moderate at 1300. Skip it.
Saturday the 8th is better. The morning has a 5ft SSW swell with clean offshore wind from the SSE at only 3 mph. That’s glassy. The energy is still decent at 889. The afternoon sees a 5ft ESE swell with a 13-second period – that’s a long period groundswell, so it’ll have shape, but it might wall up at the beach. Energy jumps to 1041. Good for beginners.
Sunday the 9th is a step up. The morning has a 7ft E swell, 13-second period, and a light cross-shore wind. Energy is 1616. The afternoon holds similar size, but the breeze turns cross-on. Still a solid day.
Monday the 10th is the real standout. The morning has a 7ft E swell, 12-second period, and clean cross-off wind from the NNE at 15 mph. That’s 1550 energy and clean. The afternoon gets bigger, hitting 8ft from the ENE, but the wind turns cross-shore. Energy is massive at 3533. The morning is the pick for the cleanest waves.
Tuesday the 11th is a step down. The morning has a 7ft ENE swell, clean wind, but energy drops to 1443. The afternoon gets smaller and choppier.
Wednesday the 12th is a strange one. The morning is junk – 8ft, but a short 7-second period and onshore wind. The afternoon, though, is a surprise: 3ft SSW swell, clean offshore wind from the NW at 3 mph. The guidance says “very good surf conditions.” Energy is 562. Small, but glassy.
The 13th and 14th have 5ft to 8ft E swells, with moderate energy and clean cross-off winds. The morning of Friday the 14th is the best there – 8ft, 12-second period, clean. Energy is 1964.
The 15th and 16th keep the swell in the 7ft to 8ft range, with clean offshore winds, especially the afternoon of Sunday the 16th. That has a 6ft ENE swell, a light 6 mph cross-off breeze, and the guidance says “very good surf conditions.” A late gem.
After that, it fades. The 17th and 18th are smaller and onshore. By the 19th, we’re down to 5ft. The 20th through the 22nd are weak, with small swells under 4ft, low energy (around 300-360), and onshore winds. It’s a slow fade.
The standout is Monday the 10th morning – that 7ft clean, lined-up E swell with cross-off wind is the best of the batch. The Sunday the 16th afternoon is a close second. For the rest, it’s a waiting game. Big Ben is inconsistent, so this empty run at the end is normal. Keep an eye on it.
Rusty.
Short Range ForecastMostly dry. Warm (max 29°C on Fri afternoon, min 23°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 29mm), heaviest during Tue afternoon. Warm (max 28°C on Mon afternoon, min 23°C on Mon night). Wind will be generally light. | |||||||||||||||||||
Fri 7 | Saturday 8 | Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | ||||||||||||||
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) | S 12 | S 11 | SSW 11 | ESE 13 | ESE 14 | E 13 | E 13 | E 12 | E 12 | ENE 12 | E 11 | ENE 12 | ENE 12 | E 10 | ESE 7 | SSW 11 | E 10 | E 10 | E 10 | E 11 |
Wave Graph | ||||||||||||||||||||
887 | 617 | 513 | 633 | 1360 | 1421 | 1335 | 942 | 1269 | 1840 | 1104 | 1220 | 791 | 250 | 448 | 223 | 468 | 562 | 551 | 646 | |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | glassy | cross | cross-on | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-on | on | off | cross-on | cross | cross | cross-off |
High Tide | 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 | 4:00AM1.54m | 5:41PM1.52m | ||||||||
Low Tide | 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 | 10:54AM0.14m | 11:08PM0.81m | ||||||||
— | — | 4:52 | — | — | 4:52 | — | — | 4:54 | — | — | 4:54 | — | — | 4:56 | — | — | 4:56 | — | — | |
6:37 | — | — | 6:36 | — | — | 6:35 | — | — | 6:34 | — | — | 6:32 | — | — | 6:31 | — | — | 6:30 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | 2 | 6 | 7 | 5 | 3 | 5 | 1 | 1 | 3 |
Temp °C | 29 | 25 | 29 | 28 | 25 | 29 | 28 | 24 | 28 | 28 | 24 | 26 | 26 | 26 | 27 | 25 | 25 | 28 | 28 | 25 |
Feels °C | 31 | 28 | 32 | 29 | 28 | 30 | 30 | 26 | 26 | 26 | 25 | 25 | 25 | 25 | 29 | 28 | 28 | 28 | 29 | 27 |
Swell 1 Height (m) Direction Period (s) | S 12 | S 11 | SSW 11 | ESE 13 | ESE 14 | E 13 | E 13 | E 12 | E 12 | E 12 | E 11 | ENE 12 | ENE 12 | E 10 | SW 11 | SSW 11 | E 10 | E 10 | E 10 | E 11 |
887 | 617 | 513 | 633 | 1360 | 1421 | 1335 | 942 | 1269 | 1488 | 1104 | 1220 | 791 | 250 | 185 | 223 | 468 | 562 | 551 | 646 | |
Swell 2 Height (m) Direction Period (s) | ESE 10 | ESE 9 | ESE 12 | SSW 11 | SSW 11 | SSW 10 | SSW 11 | SW 12 | SW 12 | SW 12 | SW 12 | SSW 11 | SSW 11 | SSW 6 | SSE 13 | E 9 | SSW 11 | SSW 11 | SSW 10 | SSW 10 |
370 | 293 | 330 | 363 | 297 | 195 | 119 | 148 | 184 | 112 | 120 | 105 | 91 | 69 | 16 | 133 | 193 | 146 | 80 | 90 | |
Swell 3 Height (m) Direction Period (s) | ENE 15 | ENE 14 | E 10 | E 10 | SW 14 | — | SW 12 | SSW 10 | SSW 11 | SSW 11 | SSW 10 | SW 12 | SW 12 | SSW 11 | SE 13 | ENE 11 | SE 12 | S 11 | SW 11 | SE 12 |
43 | 41 | 46 | 45 | 29 | — | 87 | 108 | 97 | 93 | 83 | 118 | 116 | 90 | 25 | 69 | 21 | 2 | 44 | 34 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NNE 4 | ENE 12 | — | W 3 | SW 4 | SE 4 | ESE 7 | E 6 | — | — | — | — |
— | — | — | — | — | — | — | — | 29 | 1840 | — | 4 | 21 | 16 | 448 | 137 | — | — | — | — | |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 30 | 30 | 30 | 534 | 0 | 6 | 22 | 0 | 29 | 29 | 22 | 35 | 183 | 121 | 48 | 0 | 29 | 29 | 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.











