Big Ben Surf Break

Lat Long: 35.12° N 140.12° E

Big Ben Surf Forecast and Surf Report

Issued: 8 pm 02 Sep 2026 (local time)

Forecast update in  hr  min

Today's Big Ben sea temperature is
26.8°C
0.2° 

Big Ben surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Big Ben surf forecast from 2 Sep 2026:

  • Best quality surf: Sunday 6 Sep, 6PM (local time) - 10ft (3.0m), 8s period, E swell with cross-shore winds.
  • Most powerful swell: Wednesday 9 Sep, 3AM (local time) - 13ft (4.0m), 12s period, S swell with 4,749 kJ wave energy.
  • Next surfable swell (1★+): Friday 4 Sep, 6AM (local time) - 2ft (0.6m), 10s 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 Friday (Sep 04) at 6AM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.8m and 6s. Another secondary swell of 0.7m and 6s is also forecast. Another secondary swell of 0.9m and 6s 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 4.0m 12s and forecast to arrive on Wednesday (Sep 09) at 3AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 4s period and expected on Saturday (Sep 05) at 3PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Fri 4th Sep)2ft (0.6m) 10s
Best Surf 6PM (Sun 6th Sep)10ft (3.0m) 8s
Most Powerful 3AM (Wed 9th Sep)13ft (4.0m) 12s

Table - best surf conditions forecast for Big Ben over the next 16 days.


The Lowdown

Alright, Rusty here. Let’s get into it.

First up, the surf window starts on Thursday the 5th of September with a small, marginal pulse. For the next week and a half, it’s mostly a mixed bag of wind and swell, with a few short-lived windows. The big standout is a long-range swell expected around the 18th of September – but that’s a ways off and comes with a huge caveat.

The first decent chance to wet a line is Saturday afternoon the 5th at Big Ben. A small 4.3ft swell from the ESE, a period of 7 seconds. The wind is gentle and cross-offshore so it will be clean. It’s an inconsistent break to begin with, so be patient. Crowds are possible.

Monday the 7th brings a real treat. The morning has a solid 7.2ft ESE groundswell (820 energy) with glassy conditions – that’s zero wind. That’s the cleanest surf you’ll see for a while at Big Ben. The swell is a little chunky with an 8-second period, so it won’t be perfect, but glass is glass. The water temperature feels about average for this time of year.

The rest of the first week is rough. Sunday the 6th through Wednesday the 9th you’re looking at big, messy windswell with onshore or cross-onshore winds. Swells hit 13.1ft on Wednesday the 9th, but it’s a lumpy, cross-onshore mess. Unless you’re an expert on a big day, you’ll want to sit that out.

The second week starts to clean up a little. Friday morning the 11th sees a dropping 4.6ft S swell with a gentle cross-offshore breeze – clean conditions again. Then from Sunday the 13th through Tuesday the 15th there are modest pulses of E/ESE swell around 4.3ft to 5.9ft, with clean conditions each morning. The period hits 10-11 seconds on the 14th and 15th, giving the waves a bit more shape and energy (energy values between 509 and 790). These are good windows for a consistent surfer.

Now, the big one. On Thursday the 17th, the morning shows a 6.6ft E swell with a very long 14-second period, clean cross-offshore wind. Strong energy at 2135. This is a promising day for those who can handle it. The afternoon of the 17th also holds a 4.9ft S swell with light cross-offshore breeze.

Then, on Friday morning the 18th, the forecast shows a massive 9.8ft SSE groundswell with a 15-second period. The combined energy is a crazy 4370. The wind is cross-offshore at 12 mph. This is the standout of the entire 16-day window, but here’s the thing – at 9.8ft, this is expert-only territory. The long period (over 15 seconds) means it will bore in fast and straight at a beach setup. It might look better for the paddle-out, but the wave shape could be tricky. Keep this in mind. The water temperature is still just average.

So, if you’re looking for the top pick for most people, the glassy morning of Monday the 7th is your cleanest, though the swell is small-chunky. For the experienced crew, the long-range pulse on the 18th is the real heavyweight, but it’s a gamble on the shape and size.

Stay salty.

Short Range Forecast

Heavy rain (total 105mm), heaviest during Fri night. Warm (max 29°C on Thu morning, min 21°C on Fri night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 115mm), heaviest during Sat night. Warm (max 28°C on Mon morning, min 21°C on Sat night). Winds increasing (calm on Sun night, fresh winds from the S by Tue afternoon).

Thursday
3
Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
0
0
0
0
0
0
0
1
0
0
0
!
3
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.1
E
11
1
E
10
0.8
S
9
0.6
E
10
0.6
SSW
10
0.6
SSW
10
0.7
SSW
11
0.6
SSW
10
1.3
ESE
7
1.3
E
7
2.5
E
7
3
E
8
3
ESE
8
2.2
ESE
8
1.5
E
8
1.8
S
8
2.2
S
10
2.3
S
10
3.5
S
12
Wave Graph
Metric surfscale
Energy kJ
282
196
94
68
78
75
99
68
153
153
657
989
1245
619
297
443
967
985
3094
Wind (km/h)
5
SSE
15
SSW
20
SW
20
ENE
15
NE
15
ENE
25
NNE
20
NE
15
NNE
25
NNE
30
NE
25
ENE
10
ESE
5
SSW
20
S
20
SSE
25
SE
35
SSE
35
S
Wind State
cross-on
cross
cross
cross
cross
cross
cross-off
cross
cross-off
cross-off
cross
cross-on
on
glassy
cross-on
cross-on
on
cross-on
cross-on
High Tide
8:45AM1.23m
7:27PM1.48m
10:29AM1.12m
7:48PM1.43m
8:08PM1.35m
3:59PM1.32m
10:09PM1.26m
3:49PM1.38m
1:09AM1.28m
4:00PM1.44m
2:25AM1.38m
Low Tide
2:05AM0.43m
1:26PM0.96m
3:00AM0.47m
1:21PM1.08m
4:21AM0.52m
6:15AM0.51m
8:43PM1.26m
7:44AM0.44m
8:59PM1.14m
8:40AM0.37m
9:23PM1.01m
cloud
part cloud
cloud
rain showers
light rain
light rain
heavy rain
heavy rain
mod rain
heavy rain
heavy rain
heavy rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
mod rain
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:11
5:13
5:13
5:13
5:15
5:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:06
6:04
6:02
6:01
6:00
5:59
5:57
 mm
2
2
3
73
16
9
20
15
16
23
6
7
14
6
8
5
Temp °C
26
29
29
24
25
25
23
22
22
23
23
24
25
28
28
27
28
27
27
Feels °C
30
31
31
24
27
26
24
23
23
24
22
24
27
30
31
30
30
27
27
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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