Surf Forecasts:
Big Ben surf forecast from 30 Jul 2026:
- Best quality surf: Monday 3 Aug, 3PM (local time) - 10ft (3.0m), 17s period, ESE swell with cross-shore winds.
- Most powerful swell: Thursday 6 Aug, 3AM (local time) - 16ft (5.0m), 17s period, SSE swell with 13,841 kJ wave energy.
- Next surfable swell (1★+): Thursday 30 Jul, 9PM (local time) - 2.5ft (0.8m), 6s 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 Thursday (Jul 30) at 9PM. The primary swell is predicted to be 0.8m and 6s period with a secondary swell of 0.4m and 10s. Another secondary swell of 0.3m and 8s is also forecast. 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 5.0m 17s and forecast to arrive on Thursday (Aug 06) at 3AM. 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 03) at 6AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 30th Jul) | 2.5ft (0.8m) 6s |
| Best Surf | 3PM (Mon 3rd Aug) | 10ft (3.0m) 17s |
| Most Powerful | 3AM (Thu 6th Aug) | 16ft (5.0m) 17s |
Table - best surf conditions forecast for Big Ben over the next 16 days.
The Lowdown
Alright, Rusty here. Let’s break down what Big Ben’s got going on over the next couple weeks.
Water temp is 80°, which is about normal for the season, nothing weird.
We start off quiet. Thursday morning brings a tiny 2ft SSW swell with glassy wind – you could surf it, but it’s nothing special. Thursday afternoon goes flat and choppy. Friday morning improves a little to 3ft with a clean offshore breeze, still small but the best of the early stuff.
Saturday morning drops to 1ft and glassy, then a long-period 16-second SE groundswell shows up at 2ft in the afternoon. Energy is weak (200), so it’s marginal.
Sunday morning is the first real change: 5ft ESE swell with a 16-second period, moderate energy (1027). Sunday afternoon pushes to 6ft but a 12 mph cross-shore wind messes with the shape.
Monday, August 3rd, is the highlight. Morning brings 8ft at 17 seconds from the ESE, with a clean cross-off breeze. Energy is strong at 3423. That’s a big, powerful groundswell and only for experienced surfers – the long period can make it sketchy at a beach break. Monday afternoon jumps to 10ft, cross-shore wind, energy at 5029. Too big for most.
Tuesday the 4th and Wednesday the 5th bring 12ft to 15ft of SE and SSE swell, with very strong energy (6456 to 13760). That’s massive, but the wind stays cross or cross-on. At this size, Big Ben is more for kiteboarding than paddle surfing. Conditions are messy.
The rest of the first week stays huge (10ft to 15ft) with onshore or cross-on winds and storms – poor quality.
Into the second week, the swell drops but the quality stays marginal. Saturday, August 8th, shows 5ft SW swell with a light cross-on breeze, moderate energy (2049). Not clean. Sunday and Monday hold at 5ft to 6ft, but wind is bumpy. Tuesday morning offers a cleaner look: 6ft east swell with a cross-off breeze, but moderate energy (1464) and dropping period.
Wednesday the 12th is 5ft at 12 seconds with a light cross-shore – small but okay for a longboard session. Thursday and Friday fade to 4ft and 4ft, with wind cranking 15-19 mph, choppy and onshore. Not good.
The standout is Monday morning, August 3rd: 8ft ESE groundswell at 17 seconds, clean cross-off wind. It’s big and powerful, experts only, and the long period might make it a bit straight, but that’s your best window. Everything else is either too small, too windy, or way too big.
Keep an eye on that Monday if you’re ready for a challenge.
- Rusty
Short Range ForecastMostly dry. Warm (max 31°C on Thu morning, min 26°C on Thu night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 30°C on Sun morning, min 23°C on Sun night). Wind will be generally light. | ||||||||||||||||||||
Thursday 30 | Friday 31 | Saturday 1 | Sunday 2 | Monday 3 | Tuesday 4 | Wednesday 5 | |||||||||||||||
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 10 | SSW 6 | SW 6 | SSW 7 | SSW 6 | E 11 | E 11 | SE 16 | ESE 15 | ESE 16 | ESE 15 | ESE 16 | ESE 17 | ESE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 16 | SSE 17 |
Wave Graph  | |||||||||||||||||||||
 kJ | 23 | 36 | 98 | 62 | 44 | 21 | 21 | 124 | 272 | 933 | 1238 | 2461 | 3296 | 4931 | 5074 | 6363 | 7979 | 9820 | 11734 | 11600 | 13547 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | glassy | cross | glassy | cross-off | on | glassy | glassy | on | glassy | cross | cross | cross | cross-off | cross | cross-off | cross | cross | cross-off | cross | cross-on | cross |
High Tide | 6:13PM1.51m | 5:03AM1.55m | 6:35PM1.50m | 5:45AM1.54m | 6:57PM1.49m | 6:27AM1.49m | 7:20PM1.48m | 7:11AM1.41m | 7:42PM1.47m | 7:59AM1.30m | 8:06PM1.45m | 9:01AM1.18m | 8:31PM1.43m | ||||||||
Low Tide | 11:20AM0.08m | 11:34PM0.85m | 11:52AM0.14m | 00:07AM0.76m | 12:24PM0.23m | 00:41AM0.69m | 12:53PM0.36m | 1:18AM0.62m | 1:22PM0.51m | 1:59AM0.58m | 1:49PM0.67m | 2:48AM0.56m | 2:13PM0.83m | ||||||||
 | |  | | | | | |  |  | | | | | | | | | | |  | |
 | 4:46 | — | — | 4:47 | — | — | 4:47 | — | — | 4:48 | — | — | 4:48 | — | — | 4:50 | — | — | 4:50 | — | — |
 | — | 6:45 | — | — | 6:44 | — | — | 6:43 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Temp °C | 31 | 30 | 27 | 31 | 30 | 27 | 31 | 30 | 27 | 30 | 28 | 25 | 27 | 27 | 24 | 28 | 28 | 25 | 29 | 29 | 26 |
Feels °C | 35 | 33 | 32 | 35 | 34 | 32 | 36 | 34 | 31 | 34 | 30 | 26 | 26 | 27 | 24 | 28 | 28 | 27 | 31 | 31 | 29 |
Swell 1 Height (m) Direction Period (s) | SSW 6 | SE 10 | SSW 6 | SSW 7 | SSW 6 | SSW 6 | S 6 | SE 16 | ESE 15 | ESE 16 | ESE 15 | ESE 16 | ESE 17 | ESE 17 | SE 16 | SE 16 | SE 16 | SE 16 | SSE 16 | SSE 16 | SSE 17 |
| kJ | 23 | 24 | 44 | 62 | 44 | 15 | 16 | 124 | 272 | 933 | 1238 | 2461 | 3296 | 4931 | 5074 | 6363 | 7979 | 9820 | 11734 | 11600 | 13547 |
Swell 2 Height (m) Direction Period (s) | SE 10 | E 8 | SE 10 | SE 10 | SE 9 | E 11 | E 11 | S 6 | ESE 10 | ENE 16 | ENE 15 | E 15 | E 14 | E 14 | E 14 | E 14 | E 13 | E 13 | — | S 21 | E 10 |
| kJ | 23 | 13 | 15 | 14 | 14 | 21 | 21 | 17 | 56 | 82 | 72 | 109 | 101 | 98 | 94 | 93 | 87 | 87 | — | 1703 | 354 |
Swell 3 Height (m) Direction Period (s) | E 9 | ENE 12 | ENE 8 | ENE 8 | ENE 8 | SE 4 | NE 8 | E 11 | SE 18 | NE 7 | ENE 7 | — | — | — | — | — | — | — | — | — | — |
| kJ | 14 | 14 | 14 | 13 | 13 | 2 | 15 | 59 | 154 | 12 | 5 | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | — | SSW 6 | SW 6 | — | — | — | — | — | — | — | — | NE 4 | NE 5 | NE 5 | — | — | — | — | — | E 11 | E 10 |
| kJ | — | 36 | 98 | — | — | — | — | — | — | — | — | 17 | 26 | 45 | — | — | — | — | — | 457 | 601 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 30 | 0 | 0 | 30 | 22 | 0 | 30 | 0 | 22 | 81 | 29 | 29 | 184 | 63 | 184 | 29 | 29 | 29 | 48 | 29 |
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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