Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 pm 13 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
27.3° C
0.3° 

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 (13 Aug):

  • Afternoon surf: Afternoon surf (13 Aug, local time) - 2.5ft (0.7m), 10s period with E swell.
  • Evening surf: Evening surf (13 Aug, local time) - 3ft (0.9m), 11s period with E swell.

The current surf forecast for Katahama at 6PM is: 0.8m 10s primary swell from a East direction and 0.8m 4s secondary swell from a East direction (forecast issued at 02:00pm August 13). An open ocean swell of 0.9m 9s is not directed at the surf break. The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (13 Aug)--
Afternoon (13 Aug)2.5ft (0.7m)10s
Evening (13 Aug)3ft (0.9m)11s

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


Short Range Forecast

Moderate rain (total 10mm), heaviest on Thu afternoon. Warm (max 29°C on Thu afternoon, min 25°C on Thu night). Wind will be generally light.

Thu
13
Friday
14
Saturday
15
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)
0
0
0
1
1
1
0
0
0
0
0
1
1
1
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.7
E
10
0.7
E
10
0.8
E
10
0.9
E
11
1.1
E
11
1.1
E
10
1.1
E
10
1.1
E
10
1.2
E
10
1.3
E
10
1.3
E
10
0.9
E
10
0.9
E
10
1.2
E
10
1.4
E
10
1.5
E
10
1.5
E
10
1.4
ESE
10
1.4
ESE
10
1.4
ESE
10
Wave Graph
Metric surfscale
Energy kJ
87
87
121
178
267
257
252
252
300
352
352
165
162
288
384
434
440
394
386
386
Wind (km/h)
15
E
10
ESE
10
E
10
ENE
15
NE
15
NE
15
NE
20
ENE
15
ENE
15
ESE
15
ESE
10
E
15
NE
15
NE
15
NE
20
ENE
15
ESE
20
ESE
20
ESE
15
E
Wind State
cross-on
on
cross-on
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross-on
cross-on
on
on
cross-on
High Tide
6:11PM1.68m
5:35AM1.70m
6:33PM1.72m
6:13AM1.71m
6:57PM1.75m
Low Tide
11:43AM0.31m
00:01AM0.83m
12:10PM0.34m
00:30AM0.73m
12:39PM0.39m
clear
clear
thunderstorm
thunderstorm
thunderstorm
cloud
part cloud
clear
clear
clear
thunderstorm
thunderstorm
clear
clear
part cloud
part cloud
clear
clear
part cloud
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:05
5:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:37
6:36
 mm
3
3
1
1
1
1
Temp °C
29
29
27
26
25
25
25
27
29
29
27
26
25
25
25
27
28
28
27
26
Feels °C
30
31
30
29
27
27
26
27
30
31
29
29
27
27
26
27
29
28
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)
Map placeholder
How to use the Wavefinder 

FREE! Surf-Forecast.com widget for your website

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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