Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 21 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 (21 Sep):

  • Morning surf: Morning surf (21 Sep, local time) - 16ft (5.0m), 13s period with SSE swell.
  • Afternoon surf: Afternoon surf (21 Sep, local time) - 15ft (4.5m), 13s period with SSE swell.
  • Evening surf: Evening surf (21 Sep, local time) - 11ft (3.5m), 12s period with SSE swell.

The current surf forecast for Katahama at 10AM is: 5.0m 13s primary swell from a South-southeast direction (forecast issued at 02:00am September 21). An open ocean swell of 1.6m 6s is not directed at the surf break. The wind direction is predicted to be cross-offshore and the swell rating is 11.

Time (JST) & DateWave HeightWave Period
Morning (21 Sep)16ft (5.0m)13s
Afternoon (21 Sep)15ft (4.5m)13s
Evening (21 Sep)11ft (3.5m)12s

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


Short Range Forecast

Heavy rain (total 72mm), heaviest during Mon morning. Warm (max 28°C on Tue morning, min 22°C on Wed morning). Winds decreasing (strong winds from the NNE on Mon afternoon, calm by Tue morning).

Monday
21
Tuesday
22
Wednesday
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
0
0
0
!
!
!
4
3
2
2
0
0
0
0
0
0
0
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)
4
SE
12
4
SE
13
4.5
SSE
13
5
SSE
13
5
SSE
13
4.5
SSE
13
4.5
SE
12
3.5
SSE
12
1.9
ESE
10
1.9
ESE
10
1.4
ESE
10
1
SSE
9
1
SSE
9
0.9
SSE
8
0.9
SSE
8
0.8
SSE
8
0.8
SSE
8
0.7
S
7
1.1
ENE
5
1.7
E
6
1.6
E
6
1.4
E
6
1.4
E
6
1.3
E
6
Wave Graph
Metric surfscale
Energy kJ
4278
5498
6208
7931
8453
7211
6123
3405
710
711
334
172
165
111
96
85
77
54
56
197
184
130
125
111
Wind (km/h)
35
NE
40
NE
35
NE
40
NE
40
NE
40
NNE
25
N
10
WNW
15
WNW
10
WNW
10
WNW
5
NW
15
ENE
20
E
25
E
15
E
15
ENE
20
NE
20
NE
20
NE
20
NE
20
NE
15
NE
15
NE
Wind State
cross
cross
cross
cross
cross
cross-off
cross-off
cross-off
cross-off
off
off
glassy
cross-on
cross-on
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
High Tide
00:31AM1.31m
3:33PM1.51m
2:17AM1.37m
4:00PM1.58m
3:16AM1.47m
4:22PM1.63m
Low Tide
8:06AM0.62m
9:30PM1.10m
9:08AM0.57m
10:02PM0.97m
9:51AM0.54m
light rain
light rain
cloud
heavy rain
heavy rain
mod rain
heavy rain
part cloud
part cloud
clear
clear
clear
clear
part cloud
part cloud
light rain
light rain
light rain
part cloud
light rain
light rain
part cloud
cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:33
5:33
5:35
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:45
5:45
5:44
 mm
1
1
17
25
10
12
1
2
2
2
1
Temp °C
23
24
24
23
24
25
25
25
24
24
24
26
28
27
25
25
23
23
23
22
22
23
23
23
Feels °C
20
21
21
20
21
22
25
28
26
26
27
29
30
28
25
27
24
23
23
22
21
22
22
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.


Nearest locationNearest