Big Ben Surf Break

Lat Long: 35.12° N 140.12° E

Big Ben Surf Forecast and Surf Report

Issued: 8 pm 21 Aug 2026 (local time)

Forecast update in  hr  min

Today's Big Ben sea temperature is
27.3° C
0.5° 

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 21 Aug 2026:

  • Best quality surf: Monday 24 Aug, 6AM (local time) - 3ft (0.9m), 19s period, SSE swell with glassy winds.
  • Most powerful swell: Tuesday 25 Aug, 12AM (local time) - 8ft (2.5m), 14s period, SSE swell with 2,488 kJ wave energy.
  • Next surfable swell (1★+): Saturday 22 Aug, 6PM (local time) - 3.5ft (1.0m), 11s 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 Saturday (Aug 22) at 6PM. The primary swell is predicted to be 1.0m and 11s period with a secondary swell of 0.6m and 5s. 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 2.5m 14s and forecast to arrive on Tuesday (Aug 25) at 12AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Friday (Aug 28) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Sat 22nd Aug)3.5ft (1.0m) 11s
Best Surf 6AM (Mon 24th Aug)3ft (0.9m) 19s
Most Powerful12AM (Tue 25th Aug)8ft (2.5m) 14s

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


The Lowdown

Right then, let’s have a look at what’s on the cards for us here. Big Ben’s our only real option so let’s dive into it.

First up, the forecast starts off pretty limp. We’ve got a bit of swell hanging around, but the wind is messy and the conditions are just not cooperating for a decent paddle. You’ll be staring at some weak, choppy lines with very low energy and not much on offer for the first few days. Saturday the 22nd through to Sunday the 23rd, it’s a write-off, with wave heights barely hitting 3 ft to 3 ft and combined energy stuck in the low-to-mid hundreds. Honestly, not worth wetting your wetsuit for.

But then things look like they might turn the corner. The standout moment here, and I mean the real highlight, is looking at Monday morning the 24th of August. The swell gets a proper kick, with the summary height coming in around 5 ft from the SSE, and the period stretching out to a very long 18 seconds. That’s a groundswell, full of power, and the combined energy is way up at 1563. The wind is glassy, dead calm, so it’ll be absolutely pristine. For a break like Big Ben, a long period swell like that could mean cleaner, more defined lines, especially with the optimum direction hitting from the SSE. The water temperature feels about average for the time of year, nothing wild to report. That Monday morning is the one for the experienced crew, as the size is solid and the quality looks excellent.

Now, after that, things get a bit tricky. Tuesday the 25th has a bigger swell, 6 ft to 8 ft, but the wind swings onshore or cross-shore and creates some chop. The energy stays high, but it’s not the same glassy magic. The following days into the end of August see the swell back off and the weather turns pretty grim with thunderstorms and heavy rain, making it a write-off for any decent surfing.

However, looking further out, Sunday morning the 30th of August is another one that has my attention. The swell is pushing 8 ft from the SSE with a period of 12 seconds, giving a combined energy of 1936. And the wind is light and cross-off, keeping things clean. This is big, powerful surf, so it’s one for the experts again. It gets even bigger into the start of September, but those swells on the 31st and 1st are predicted to be too big for this break, with winds turning onshore and making it a bit of a mess.

After that big pulse, it settles down into a cleaner but smaller pattern through the first week of September. The winds look better, but the waves drop off. There’s a gap of a few days with no real standouts. The best of the bunch for the second week is Wednesday morning the 2nd of September, with a 7 ft swell from the east and a clean, cross-off wind. It’s solid, but not the glassy perfection of that Monday morning.

So, to wrap it up: the clear winner is Big Ben on Monday the 24th of August for the morning session. It’s a classic glassy, long-period groundswell with heaps of energy. That’s the one to circle on your calendar. The Sunday the 30th is a good backup if you want some power. For the beginners, this is either too small and messy or too big and powerful. Keep an eye on the long-range stuff, but the near-term is looking the best.

Rusty.

Short Range Forecast

Light rain (total 5mm), mostly falling on Sat afternoon. Warm (max 29°C on Sat afternoon, min 24°C on Sat night). Wind will be generally light.

Days 5-7 Weather Summary

Light rain (total 6mm), mostly falling on Thu afternoon. Warm (max 29°C on Tue morning, min 24°C on Thu afternoon). Wind will be generally light.

Saturday
22
Sunday
23
Monday
24
Tuesday
25
Wednesday
26
Thursday
27
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
1
1
2
1
0
2
4
2
3
3
2
2
0
1
0
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.6
E
10
0.9
E
10
1
E
11
1
E
10
0.8
ENE
10
0.6
SSE
13
0.8
SSE
13
1.4
SSE
18
2.2
SSE
16
2.5
SSE
14
1.9
SSE
13
2.3
S
14
1.9
S
13
1.4
SSW
12
1.2
SSW
12
0.9
SSW
12
1.4
SSW
11
0.8
E
14
0.9
E
13
Wave Graph
Metric surfscale
Energy kJ
66
175
231
198
125
106
209
1246
2429
2488
1249
2037
1181
558
433
247
415
236
285
Wind (km/h)
15
SW
15
SW
15
SW
0
NW
15
NE
15
ENE
5
NNE
5
SE
15
SSW
15
SW
15
SW
20
SSW
15
SSW
20
SSW
20
SW
20
SSW
20
SW
15
WSW
15
SW
Wind State
cross
cross
cross
glassy
cross
cross-on
glassy
glassy
cross-on
cross
cross
cross
cross
cross-on
cross
cross
cross
cross-off
cross
High Tide
9:26PM1.33m
4:10PM1.33m
00:01AM1.29m
4:16PM1.41m
1:46AM1.34m
4:31PM1.46m
2:51AM1.43m
4:50PM1.50m
3:40AM1.52m
5:08PM1.52m
Low Tide
5:40AM0.51m
7:19AM0.44m
8:35PM1.23m
8:26AM0.35m
9:17PM1.13m
9:13AM0.27m
9:46PM1.02m
9:53AM0.22m
10:14PM0.89m
10:28AM0.21m
10:42PM0.76m
clear
part cloud
rain showers
thunderstorm
thunderstorm
part cloud
part cloud
clear
clear
clear
clear
clear
clear
part cloud
cloud
rain showers
thunderstorm
light rain
heavy rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:03
5:03
5:05
5:05
5:05
5:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:22
6:20
6:19
6:17
6:16
6:15
6:14
 mm
1
3
1
1
2
3
12
Temp °C
26
28
29
25
27
27
25
28
28
26
29
29
26
28
27
27
26
24
24
Feels °C
28
30
32
30
29
29
30
31
30
29
30
31
29
31
29
29
28
26
26
  • Map Icons:
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  • 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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