Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 pm 20 Sep 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
25.1°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 (20 Sep):

  • Afternoon surf: Afternoon surf (20 Sep, local time) - 11ft (3.5m), 12s period with SE swell.
  • Evening surf: Evening surf (20 Sep, local time) - 11ft (3.5m), 12s period with SE swell.

The current surf forecast for Katahama at 7PM is: 3.5m 12s primary swell from a Southeast direction and 0.2m 13s secondary swell from a East direction (forecast issued at 02:00pm September 20). An open ocean swell of 1.1m 6s is not directed at the surf break. The wind direction is predicted to be cross-shore and the swell rating is 11.

Time (JST) & DateWave HeightWave Period
Morning (20 Sep)--
Afternoon (20 Sep)11ft (3.5m)12s
Evening (20 Sep)11ft (3.5m)12s

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


Short Range Forecast

Heavy rain (total 55mm), heaviest during Mon night. Warm (max 29°C on Tue morning, min 23°C on Sun afternoon). Winds decreasing (strong winds from the NNE on Mon afternoon, light winds from the ESE by Tue morning).

Sun
20
Monday
21
Tuesday
22
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
!
!
5
3
3
2
1
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)
3.5
SE
12
3.5
SE
12
3.5
SE
12
3.5
SE
12
3.5
SE
12
4
SSE
13
4.5
SSE
13
4.5
SSE
13
4.5
SSE
13
5
SSE
13
5.5
SSE
13
5
SE
13
2.5
SSE
12
2.5
ESE
10
1.9
ESE
10
1.2
SSE
9
1.1
SSE
9
1
SSE
9
0.9
SSE
8
0.9
SSE
8
Wave Graph
Metric surfscale
Energy kJ
3027
2943
3184
3359
3914
5130
6346
7111
7453
8043
11200
8970
1863
1306
670
237
184
158
115
109
Wind (km/h)
30
NE
35
ENE
35
NE
35
NE
30
NE
35
NE
30
NE
30
NE
35
NE
40
NE
45
NNE
35
N
15
WNW
20
W
15
NW
5
WNW
5
ESE
15
E
15
NE
20
ENE
Wind State
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-off
cross-off
cross-off
cross-off
off
cross-off
cross-on
cross-on
cross
cross-on
High Tide
2:57PM1.42m
00:31AM1.31m
3:33PM1.51m
2:17AM1.37m
4:00PM1.58m
Low Tide
8:29PM1.23m
8:06AM0.62m
9:30PM1.10m
9:08AM0.57m
light rain
light rain
mod rain
light rain
rain showers
light rain
light rain
light rain
light rain
light rain
mod rain
heavy rain
rain showers
clear
clear
clear
clear
clear
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:33
5:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:47
5:45
5:45
 mm
3
1
6
3
1
1
4
3
1
4
8
15
4
Temp °C
23
23
23
23
23
24
24
24
25
25
25
25
25
24
24
27
29
28
27
25
Feels °C
22
21
21
21
21
22
23
23
23
23
22
23
28
25
26
30
33
30
29
26
  • 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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