Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 8 am 17 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
27.0° C
0.6° 

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 (17 Aug):

  • Morning surf: Morning surf (17 Aug, local time) - 3.5ft (1.0m), 8s period with E swell.
  • Afternoon surf: Afternoon surf (17 Aug, local time) - 3ft (0.9m), 9s period with ESE swell.
  • Evening surf: Evening surf (17 Aug, local time) - 3ft (0.9m), 8s period with ESE swell.

The current surf forecast for Katahama at 11AM is: 1.0m 9s primary swell from a East direction and 0.3m 11s secondary swell from a Southeast direction (forecast issued at 08:00am August 17). An open ocean swell of 0.6m 8s is not directed at the surf break. The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (17 Aug)3.5ft (1.0m)8s
Afternoon (17 Aug)3ft (0.9m)9s
Evening (17 Aug)3ft (0.9m)8s

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


Short Range Forecast

Mostly dry. Warm (max 28°C on Wed morning, min 24°C on Mon night). Wind will be generally light.

Monday
17
Tuesday
18
Wednesday
19
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)
0
0
0
0
0
0
0
1
0
0
0
0
0
0
1
1
1
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)
0.9
E
8
1
E
8
1
E
9
0.9
ESE
9
0.9
ESE
8
0.9
ESE
8
0.9
ESE
8
0.8
ESE
8
0.8
ESE
8
0.7
ESE
8
0.9
ESE
8
0.6
ESE
8
0.7
SE
7
0.8
ESE
7
0.8
ESE
7
0.8
ESE
7
0.8
ESE
7
0.7
ESE
7
0.6
ESE
7
0.6
ESE
7
0.4
SE
10
0.4
SE
10
Wave Graph
Metric surfscale
Energy kJ
113
140
158
126
127
101
101
80
78
70
115
47
56
62
59
57
54
41
35
34
32
30
Wind (km/h)
15
ENE
15
ENE
15
ESE
20
SE
15
SE
15
ESE
10
E
10
NNE
10
NE
10
E
10
SE
15
SSE
10
SE
5
ESE
5
ENE
5
NNE
5
NNE
10
E
10
SE
15
SSE
10
SE
5
SE
Wind State
cross
cross-on
on
on
on
on
cross-on
cross-off
cross
cross-on
on
on
on
cross-on
glassy
glassy
glassy
cross-on
on
on
on
on
High Tide
7:35AM1.61m
7:54PM1.75m
8:21AM1.51m
8:26PM1.70m
9:17AM1.38m
9:00PM1.63m
Low Tide
1:39PM0.59m
2:23AM0.57m
2:11PM0.73m
3:13AM0.59m
2:45PM0.89m
part cloud
clear
part cloud
part cloud
clear
clear
part cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:07
5:09
5:09
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:32
6:31
6:30
 mm
Temp °C
24
26
27
27
26
26
25
24
25
26
27
27
26
26
25
24
24
26
28
28
26
26
Feels °C
26
27
28
27
27
28
28
27
28
28
29
28
28
30
29
27
27
28
30
30
29
30
  • 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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