Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 pm 15 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
27.4° C
0.2° 

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 (15 Aug):

  • Afternoon surf: Afternoon surf (15 Aug, local time) - 5ft (1.5m), 10s period with E swell.
  • Evening surf: Evening surf (15 Aug, local time) - 4.5ft (1.3m), 10s period with ESE swell.

The current surf forecast for Katahama at 6PM is: 1.4m 10s primary swell from a East-southeast direction and 0.3m 8s secondary swell from a South-southeast direction (forecast issued at 02:00pm August 15). An open ocean swell of 0.9m 10s is not directed at the surf break. The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (15 Aug)--
Afternoon (15 Aug)5ft (1.5m)10s
Evening (15 Aug)4.5ft (1.3m)10s

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


Short Range Forecast

Some drizzle, heaviest during Sat night. Warm (max 28°C on Sat afternoon, min 24°C on Sat night). Wind will be generally light.

Sat
15
Sunday
16
Monday
17
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
0
0
1
1
0
0
0
0
0
0
0
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)
1.5
E
10
1.5
E
10
1.4
ESE
10
1.3
ESE
10
1.2
ESE
10
1.3
ESE
10
0.9
E
10
0.8
E
10
1.3
E
10
0.6
E
10
0.7
E
9
1
E
9
0.9
ESE
9
0.9
ESE
8
0.9
E
8
0.9
E
8
0.9
E
9
0.9
ESE
9
0.9
ESE
8
0.8
ESE
8
Wave Graph
Metric surfscale
Energy kJ
426
431
386
342
276
342
158
117
319
69
73
151
123
118
113
113
125
126
120
96
Wind (km/h)
20
E
20
ESE
25
ESE
20
E
10
ENE
10
ENE
15
ENE
20
ENE
15
E
20
ESE
20
ESE
15
E
10
E
10
NE
15
NE
15
ENE
10
ESE
15
SE
15
SE
10
ESE
Wind State
cross-on
on
on
cross-on
cross-on
cross
cross
cross-on
cross-on
on
on
cross-on
cross-on
cross
cross
cross
cross-on
on
on
cross-on
High Tide
6:57PM1.75m
6:53AM1.68m
7:24PM1.76m
7:35AM1.61m
7:54PM1.75m
Low Tide
12:39PM0.39m
1:04AM0.65m
1:08PM0.48m
1:41AM0.59m
1:39PM0.59m
thunderstorm
clear
clear
part cloud
thunderstorm
clear
clear
part cloud
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:07
5:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:36
6:35
6:32
 mm
1
1
Temp °C
28
28
27
26
25
25
24
26
27
27
26
26
25
25
24
26
27
27
26
26
Feels °C
29
28
27
27
27
27
25
26
27
27
26
28
27
27
25
27
28
28
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 

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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