Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 8 am 17 Sep 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
26.3°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 (17 Sep):

  • Morning surf: Morning surf (17 Sep, local time) - 3.5ft (1.1m), 7s period with E swell.
  • Afternoon surf: Afternoon surf (17 Sep, local time) - 5ft (1.5m), 7s period with E swell.
  • Evening surf: Evening surf (17 Sep, local time) - 6ft (1.9m), 6s period with E swell.

The current surf forecast for Katahama at 2PM is: 1.4m 7s primary swell from a East direction and 0.3m 12s secondary swell from a East direction, 0.1m 9s secondary swell from a Southeast direction (forecast issued at 08:00am September 17). The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (17 Sep)3.5ft (1.1m)7s
Afternoon (17 Sep)5ft (1.5m)7s
Evening (17 Sep)6ft (1.9m)6s

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


Short Range Forecast

Light rain (total 2mm), mostly falling on Sat night. Warm (max 26°C on Sat morning, min 21°C on Thu night). Mainly fresh winds.

Thursday
17
Friday
18
Saturday
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
0
0
2
3
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)
1
E
7
1.1
E
7
1.3
E
7
1.5
E
7
1.6
E
7
1.9
E
6
0.1
S
9
0.3
E
11
0.2
SSE
9
0.1
SE
12
0.1
SE
12
0.2
SSE
11
0.2
SSE
11
0.4
SE
14
0.8
SE
14
1.5
SE
13
2.1
SE
14
2.5
SE
14
3
ESE
14
3
ESE
13
3.5
ESE
13
3.5
ESE
13
Wave Graph
Metric surfscale
Energy kJ
103
124
168
229
260
299
2
23
7
6
6
13
13
66
265
778
1595
2458
3531
3531
3611
3559
Wind (km/h)
20
NE
15
NE
20
ENE
20
NE
25
ENE
30
ENE
25
NE
25
NE
25
NE
30
ENE
30
ENE
25
ENE
25
ENE
25
NE
25
NE
15
NNE
15
NNE
25
NE
25
ENE
25
ENE
30
ENE
30
ENE
Wind State
cross
cross
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross
cross-off
cross-off
cross
cross
cross
cross
cross
High Tide
8:59AM1.43m
8:10PM1.64m
10:22AM1.32m
8:46PM1.52m
1:24PM1.31m
Low Tide
2:10PM1.01m
3:29AM0.55m
2:53PM1.15m
4:47AM0.62m
4:45PM1.27m
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:30
5:31
5:31
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:52
5:51
5:49
 mm
Temp °C
22
23
24
24
24
23
21
21
21
22
24
25
25
24
23
22
22
25
26
26
25
25
Feels °C
22
23
23
23
22
20
18
18
18
17
20
22
22
22
21
21
21
23
24
25
23
23
  • 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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