Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 8 am 16 Sep 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
26.5°C
0.1° 

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 (16 Sep):

  • Morning surf: Morning surf (16 Sep, local time) - 1.5ft (0.5m), 13s period with E swell.
  • Afternoon surf: Afternoon surf (16 Sep, local time) - 1.5ft (0.5m), 13s period with E swell.
  • Evening surf: Evening surf (16 Sep, local time) - 1.5ft (0.5m), 12s period with E swell.

The current surf forecast for Katahama at 4PM is: 0.5m 13s primary swell from a East direction and 0.7m 8s secondary swell from a Southeast direction, 0.5m 4s secondary swell from a East direction (forecast issued at 08:00am September 16). The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (16 Sep)1.5ft (0.5m)13s
Afternoon (16 Sep)1.5ft (0.5m)13s
Evening (16 Sep)1.5ft (0.5m)12s

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


Short Range Forecast

Heavy rain (total 32mm), heaviest during Wed morning. Warm (max 25°C on Fri morning, min 21°C on Thu night). Wind will be generally light.

Wednesday
16
Thursday
17
Friday
18
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)
1
0
1
0
0
0
0
0
0
0
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
Wave
Height (m)
Direction
Period (s)
0.5
E
13
0.5
E
13
0.5
E
13
0.5
E
13
0.5
E
13
0.5
E
12
0.5
E
12
0.4
E
12
1
E
7
1.3
E
7
1.3
E
7
1.4
E
7
1.8
E
6
0.1
S
9
0.2
SSE
9
0.1
SE
9
0.1
S
13
0.1
SE
12
0.1
SE
12
0.2
SSE
12
0.4
SE
17
0.8
SE
15
Wave Graph
Metric surfscale
Energy kJ
84
84
84
83
82
74
71
51
94
159
178
212
268
1
8
3
3
6
6
14
102
330
Wind (km/h)
5
NNW
5
ENE
5
NNE
5
ENE
10
ENE
15
NE
15
NE
20
NE
15
NE
20
NE
15
ENE
20
NE
20
NE
25
ENE
25
NE
20
NE
20
NE
25
NE
25
ENE
25
ENE
30
ENE
25
NE
Wind State
off
cross
glassy
cross-on
cross-on
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
8:05AM1.54m
7:37PM1.73m
8:59AM1.43m
8:10PM1.64m
10:22AM1.32m
8:46PM1.52m
Low Tide
1:36PM0.87m
2:33AM0.47m
2:10PM1.01m
3:29AM0.55m
2:53PM1.15m
mod rain
heavy rain
light rain
thunderstorm
light rain
light rain
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:30
5:30
5:31
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:53
5:52
5:51
 mm
7
16
4
5
5
2
Temp °C
22
22
23
22
22
22
22
22
22
23
24
24
23
22
22
21
21
22
25
25
24
24
Feels °C
25
26
27
25
25
23
22
22
22
22
24
23
21
19
20
19
19
19
22
22
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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