Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 11 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
27.1° C
0.4° 

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


How big are the waves at Katahama today (11 Aug):

  • Morning surf: Morning surf (11 Aug, local time) - 4.5ft (1.3m), 10s period with E swell.
  • Afternoon surf: Afternoon surf (11 Aug, local time) - 4ft (1.2m), 12s period with E swell.
  • Evening surf: Evening surf (11 Aug, local time) - 3.5ft (1.0m), 12s period with E swell.

The current surf forecast for Katahama at 11AM is: 1.3m 11s primary swell from a East direction (forecast issued at 02:00am August 11). An open ocean swell of 0.9m 11s is not directed at the surf break. The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (11 Aug)4.5ft (1.3m)10s
Afternoon (11 Aug)4ft (1.2m)12s
Evening (11 Aug)3.5ft (1.0m)12s

Table - waves today at Katahama. (Swell directed towards the surf break)


Short Range Forecast

Moderate rain (total 12mm), heaviest on Tue night. Warm (max 29°C on Tue afternoon, min 22°C on Tue night). Winds decreasing (fresh winds from the NE on Wed afternoon, light winds from the NNE by Thu night).

Tuesday
11
Wednesday
12
Thursday
13
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
12 AM
3 AM
6 AM
9 AM
12 PM
3 PM
6 PM
9 PM
Rating
(10 max)
1
2
0
0
1
1
2
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
E
11
1.5
E
11
1.4
E
11
1.3
E
10
1.3
E
11
1.2
E
12
1.1
E
11
1
E
12
0.9
E
12
0.8
E
11
1
ESE
11
1.5
E
5
1.5
E
5
1.6
E
6
1.7
ESE
6
1.6
ESE
6
1.4
ESE
5
0.6
E
9
0.6
E
9
0.6
E
9
0.7
E
10
0.8
E
9
0.8
E
10
1
E
11
Wave Graph
Metric surfscale
Energy kJ
459
517
434
361
411
380
308
268
217
155
249
115
121
163
201
159
106
60
60
62
87
111
128
224
Wind (km/h)
5
SSE
10
SSW
15
S
15
S
10
S
15
SW
15
W
5
W
10
ESE
20
E
20
ENE
25
ENE
25
ENE
30
NE
20
ENE
20
ENE
20
ENE
15
NE
15
NE
20
NE
15
ENE
10
ESE
15
SE
5
E
Wind State
cross-on
cross
cross-on
cross-on
cross-on
cross
cross-off
cross-off
on
cross-on
cross-on
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
on
on
cross-on
High Tide
3:38AM1.54m
5:33PM1.60m
4:20AM1.60m
5:51PM1.64m
4:58AM1.66m
6:11PM1.68m
Low Tide
10:43PM1.12m
10:44AM0.34m
11:10PM1.03m
11:15AM0.31m
11:35PM0.94m
11:43AM0.31m
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
part cloud
clear
cloud
part cloud
light rain
light rain
rain showers
light rain
light rain
clear
part cloud
cloud
part cloud
part cloud
cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:03
5:03
5:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:39
6:38
6:37
 mm
3
3
2
1
3
2
1
1
1
1
1
1
Temp °C
25
24
23
24
26
29
28
27
26
23
22
23
24
23
25
24
24
24
24
26
27
28
26
26
Feels °C
28
27
24
26
29
30
28
30
29
23
21
22
22
21
24
22
23
24
24
26
28
30
28
29
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
How to use the Wavefinder 

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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Katahama surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.


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