Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 21 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
26.5° C
1.1° 

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 (21 Aug):

  • Morning surf: Morning surf (21 Aug, local time) - 1.5ft (0.4m), 11s period with SE swell.
  • Afternoon surf: Afternoon surf (21 Aug, local time) - 1.5ft (0.4m), 11s period with SE swell.
  • Evening surf: Evening surf (21 Aug, local time) - 1.5ft (0.4m), 11s period with SE swell.

The current surf forecast for Katahama at 10AM is: 0.4m 11s primary swell from a Southeast direction and 0.4m 9s secondary swell from a East-southeast direction (forecast issued at 02:00am August 21). An open ocean swell of 0.8m 9s is not directed at the surf break. The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (21 Aug)1.5ft (0.4m)11s
Afternoon (21 Aug)1.5ft (0.4m)11s
Evening (21 Aug)1.5ft (0.4m)11s

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


Short Range Forecast

Mostly dry. Warm (max 28°C on Fri morning, min 25°C on Fri night). Wind will be generally light.

Friday
21
Saturday
22
Sunday
23
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)
0
1
0
0
0
0
0
0
0
1
1
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
Height Map
Wave
Height (m)
Direction
Period (s)
0.4
SE
11
0.4
SE
11
0.4
SE
11
0.4
SE
11
0.4
SE
11
0.4
SE
11
0.4
SE
11
0.4
SE
11
0.4
SE
11
0.4
SE
11
0.4
SE
13
0.4
SE
14
0.6
E
10
0.6
E
10
0.7
E
11
0.6
E
11
0.7
E
11
0.6
E
10
0.5
E
10
0.5
E
10
0.4
SE
13
0.4
ESE
12
0.5
SE
12
0.5
SE
12
Wave Graph
Metric surfscale
Energy kJ
30
30
30
30
30
30
29
30
31
31
49
49
70
71
112
79
108
71
47
48
45
49
73
71
Wind (km/h)
5
WNW
5
WNW
5
WNW
10
SW
20
SSW
15
SSW
15
SW
10
SW
10
SW
10
WSW
10
WSW
15
SW
20
SW
20
SSW
15
SW
5
SW
5
W
5
NW
0
N
5
ESE
15
SSE
15
SE
10
SE
10
ESE
Wind State
glassy
glassy
cross-off
cross
cross-on
cross
cross
cross
cross-off
cross-off
cross-off
cross
cross
cross
cross
cross
glassy
glassy
glassy
cross-on
on
on
on
on
High Tide
9:40PM1.54m
1:49PM1.24m
10:40PM1.45m
3:42PM1.37m
00:41AM1.39m
4:19PM1.48m
Low Tide
5:36AM0.65m
4:29PM1.22m
7:17AM0.62m
7:59PM1.28m
8:42AM0.55m
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:11
5:11
5:11
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:29
6:27
6:25
 mm
Temp °C
26
25
25
27
28
28
27
26
26
25
25
27
28
28
27
27
26
26
26
27
27
26
26
26
Feels °C
30
28
28
29
29
29
29
29
29
28
29
30
30
30
29
31
30
31
31
31
30
28
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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