Choshi Surf Break

Lat Long: 35.71° N 140.80° E

Choshi Surf Forecast and Surf Report

Issued: 8 am 14 Sep 2026 (local time)

Forecast update in  hr  min

Today's Choshi sea temperature is
24.9°C
0.9° 

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


Choshi surf forecast from 14 Sep 2026:

  • Best quality surf: Saturday 19 Sep, 9AM (local time) - 10ft (3.0m), 14s period, ESE swell with cross-offshore winds.
  • Most powerful swell: Saturday 19 Sep, 9AM (local time) - 10ft (3.0m), 14s period, ESE swell with 3,528 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 15 Sep, 3PM (local time) - 4ft (1.2m), 14s period with ESE swell.

Best Forecast Surf Conditions for Choshi this week:

The surf forecast for Choshi over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 15) at 3PM. The primary swell is predicted to be 1.2m and 14s period with a secondary swell of 1.1m and 7s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Choshi in the next 16 days are 3.0m 14s and forecast to arrive on Saturday (Sep 19) at 9AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Monday (Sep 21) at 12PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3PM (Tue 15th Sep)4ft (1.2m) 14s
Best Surf 9AM (Sat 19th Sep)10ft (3.0m) 14s
Most Powerful 9AM (Sat 19th Sep)10ft (3.0m) 14s

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


The Lowdown

Alright, let’s get into it.

The next couple of weeks are a real mixed bag, and honestly, the opening stretch is pretty bleak. We’re looking at a slow start with nothing worth getting wet for, but there’s a big pulse of energy coming through the middle of the period that’s going to be something else. Just gotta be smart about it.

Starting off, Monday the 14th is basically a washout. There’s some small, weak swell pushing in from the ESE, only around 3ft, but the wind is a messy cross-shore breeze and the surf is just lumpy and poor. Nothing doing. The energy is weak at 398, and the water’s sitting at 77°, which is pretty much spot on for this time of year. It’s a non-event.

Tuesday the 15th shows a little more life, with the swell picking up to 4ft and the period stretching out to 14 seconds, giving it some decent push. The combined energy jumps to 782, which is more moderate, but the morning still has that cross-shore wind. The standout is Tuesday afternoon though. The wind drops right out, going glassy, and the waves are clean at 4ft. That’s the first real window, and it’s a good one, even if it’s not huge.

Then we hit a rough patch. Wednesday the 16th and Thursday the 17th get blown out by a fresh NE wind. The swell stays around the 3ft mark, but it’s crossed up and poor. The energy dips back down, and Thursday sees a weird spike in size to 6ft but with a terrible period of 7 seconds. That’s just messy, crumbly junk. There’s a gap in any decent surf here for a few days.

Friday the 18th and Saturday the 19th are where things start to get serious, but it’s a double-edged sword. The swell builds steadily, and Saturday the 19th delivers a solid 10ft of ESE groundswell with a 14-second period. The energy reading is massive at 3603. The wind is a clean cross-off, and the conditions are favorable. But here’s the catch – at 10ft, this is way too big for the break, and it’s only going to be for the experts that know what they’re doing. The guidance is clear: it’s too big. The wave quality is there, but it’s a beast.

Sunday the 20th backs off a touch, but it’s still a solid 8ft to 8ft, with strong energy readings around 1647-2070. The wind is clean, but the tide is questionable, so it’s marginal. The following Monday and Tuesday, the 21st and 22nd, keep that pumping. We’re seeing 7ft to 8ft with some SSE direction mixed in, and the energy is still very strong at 2690 and 3088. The break is handling it, but conditions remain marginal.

Now, for the standout. Looking at the whole period, it’s hard to ignore that Saturday the 19th through Tuesday the 22nd. The best bet is probably Monday the 21st afternoon and Tuesday the 22nd morning. The swell is still big, but backing off a bit, and the wind is a moderate cross-off keeping things clean. The energy is in that very strong range, and the direction is favorable. But remember, this is all well overhead, so it’s not a day for the beginners. It’s powerful, grinding, and definitely one for the experienced crew.

After that, it just fades out quickly. From Wednesday the 23rd, the wind swings around south and brings in rain and choppy onshores. The swell drops off a cliff, getting down to 1ft to 1ft by the weekend. The energy readings drop to below 100, which is just flat and weak. The last few days of the period are pretty much unsurfable, with poor conditions and small, messy waves.

So, to sum it up: there’s a killer window from Saturday the 19th through Tuesday the 22nd with some serious size and clean offshore winds, but it’s not for everyone. Before that and after that, you’re going to be scratching for anything rideable. Hang tight, pick your moment, and don’t get caught out by the size.

Rusty out.

Short Range Forecast

Heavy rain (total 60mm), heaviest during Wed night. Warm (max 27°C on Mon morning, min 20°C on Wed night). Winds increasing (calm on Tue afternoon, strong winds from the NNE by Wed night).

Days 4-6 Weather Summary

Moderate rain (total 15mm), heaviest on Sat afternoon. Warm (max 23°C on Sat night, min 20°C on Thu night). Winds decreasing (strong winds from the NNE on Fri afternoon, moderate winds from the NE by Sat night).

Monday
14
Tuesday
15
Wednesday
16
Thursday
17
Friday
18
Saturday
19
Sunday
20
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
0
1
3
3
0
0
0
0
0
0
0
1
3
!
!
2
2
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1
ESE
12
0.8
E
12
1
E
15
1.3
ESE
14
1.2
ESE
14
1.2
ESE
13
1
ESE
13
0.9
ESE
12
1.5
ENE
6
0.5
E
12
1.7
ENE
7
1.9
ENE
8
2.2
ENE
8
2.4
ENE
8
2.4
SE
15
3
ESE
14
3
ESE
13
2.5
ESE
12
2.4
ESE
12
2.5
ESE
13
2.4
SE
13
Wave Graph
Metric surfscale
Energy kJ
323
174
428
642
557
475
367
260
154
68
270
389
659
753
2590
3528
2723
1893
1633
1990
2036
Wind (km/h)
25
SSW
30
SSW
25
SSW
15
SW
5
NW
15
NNE
30
NE
30
NE
35
N
35
NNE
40
NNE
35
NNE
40
NNE
40
NNE
35
NNE
35
NNE
30
NNE
20
NE
30
NNE
35
NNE
30
NNE
Wind State
cross
cross-on
cross
cross
glassy
cross-off
cross-off
cross
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross-off
cross
cross-off
cross-off
cross-off
High Tide
5:21PM1.50m
6:28AM1.33m
5:40PM1.51m
7:12AM1.24m
6:00PM1.49m
8:03AM1.15m
6:22PM1.46m
9:23AM1.07m
6:45PM1.40m
7:11PM1.33m
7:53PM1.25m
Low Tide
11:30AM0.66m
00:00AM0.36m
11:54AM0.77m
00:35AM0.36m
12:14PM0.88m
1:12AM0.39m
12:30PM0.96m
1:54AM0.45m
12:30PM1.04m
2:50AM0.53m
4:17AM0.58m
clear
clear
part cloud
light rain
mod rain
mod rain
mod rain
mod rain
heavy rain
cloud
part cloud
cloud
cloud
cloud
cloud
cloud
mod rain
mod rain
mod rain
light rain
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:16
5:18
5:18
5:20
5:20
5:20
5:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:45
5:45
5:44
5:42
5:40
5:38
5:37
 mm
4
9
9
9
7
22
6
9
8
1
Temp °C
27
26
25
24
22
23
22
22
21
21
21
21
20
21
22
22
22
23
22
22
22
Feels °C
26
25
26
24
25
26
21
20
18
17
16
16
14
16
20
20
21
23
21
20
20
  • 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 Choshi Surf forecast

The above surf forecast table for Choshi provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Choshi can be found by selecting the local surf guide option on the grey menu. Our Choshi 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 (Choshi) 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 Choshi 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.

Choshi is 4 km (2 miles) from Hasaki. If you plan a holiday in Chiba, look for hotels and other accommodation in Hasaki. Hasaki has rooms for a wide range of budgets as well as car hire and transport links.

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