Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 8 am 17 Oct 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
24.3°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 (17 Oct):

  • Morning surf: Morning surf (17 Oct, local time) - 1.5ft (0.4m), 8s period with ESE swell.
  • Afternoon surf: Afternoon surf (17 Oct, local time) - 4ft (1.2m), 6s period with ESE swell.
  • Evening surf: Evening surf (17 Oct, local time) - 4.5ft (1.3m), 7s period with E swell.

The current surf forecast for Katahama at 2PM is: 1.1m 6s primary swell from a East direction and 0.2m 8s secondary swell from a South-southeast direction (forecast issued at 08:00am October 17). The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (17 Oct)1.5ft (0.4m)8s
Afternoon (17 Oct)4ft (1.2m)6s
Evening (17 Oct)4.5ft (1.3m)7s

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


Short Range Forecast

Some drizzle, heaviest during Mon night. Warm (max 23°C on Mon morning, min 19°C on Sat night). Wind will be generally light.

Saturday
17
Sunday
18
Monday
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
0
0
0
0
0
0
1
1
1
1
1
0
0
0
1
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)
0.4
ESE
8
0.4
ESE
8
0.9
E
5
1.2
ESE
6
1.3
ESE
7
1.3
E
7
1.1
E
7
1
E
8
0.9
ESE
7
0.9
ESE
6
0.9
ESE
6
0.9
ESE
6
0.9
ESE
6
0.9
SE
6
1
SE
6
1
SE
6
0.8
SE
6
0.9
SE
6
1
SE
7
1
SE
8
1
SE
9
1.1
SE
9
Wave Graph
Metric surfscale
Energy kJ
19
19
36
123
171
176
131
118
89
54
53
51
55
47
68
73
53
66
89
126
145
172
Wind (km/h)
5
NNE
15
NE
10
ESE
15
SE
20
ESE
15
ESE
10
ENE
10
ENE
10
NE
15
ENE
15
E
15
SE
10
SE
5
ENE
5
N
5
N
5
NNW
5
W
15
SW
25
SW
20
WSW
20
WSW
Wind State
cross-off
cross
on
on
on
cross-on
cross-on
cross
cross
cross
cross-on
on
on
glassy
glassy
glassy
glassy
cross-off
cross
cross
cross-off
cross-off
High Tide
10:10AM1.38m
8:17PM1.46m
12:13PM1.38m
9:29PM1.31m
1:42PM1.44m
Low Tide
3:04PM1.18m
4:09AM0.56m
5:23PM1.21m
5:40AM0.64m
7:47PM1.11m
clear
clear
part cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
clear
clear
clear
part cloud
cloud
cloud
cloud
part cloud
clear
cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:52
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—
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—
—
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5:54
—
—
—
—
—
—
—
5:54
—
—
—
—
—
—
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
—
—
—
5:10
—
—
—
—
—
—
—
5:08
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—
—
—
—
—
—
5:07
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 mm
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
—
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Temp °C
20
21
22
22
21
21
20
19
19
19
21
22
22
21
20
20
20
21
23
23
23
23
Feels °C
19
19
22
21
19
19
19
18
18
18
20
20
21
21
20
20
20
21
22
21
21
22
  • 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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