Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 8 am 14 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
27.3° 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 (14 Aug):

  • Morning surf: Morning surf (14 Aug, local time) - 4ft (1.2m), 10s period with E swell.
  • Afternoon surf: Afternoon surf (14 Aug, local time) - 4.5ft (1.3m), 10s period with E swell.
  • Evening surf: Evening surf (14 Aug, local time) - 3.5ft (1.1m), 10s period with E swell.

The current surf forecast for Katahama at 2PM is: 1.2m 10s primary swell from a East direction and 0.2m 11s secondary swell from a South-southeast direction (forecast issued at 08:00am August 14). An open ocean swell of 0.9m 9s is not directed at the surf break. The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (14 Aug)4ft (1.2m)10s
Afternoon (14 Aug)4.5ft (1.3m)10s
Evening (14 Aug)3.5ft (1.1m)10s

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


Short Range Forecast

Light rain (total 6mm), mostly falling on Fri night. Warm (max 29°C on Fri morning, min 24°C on Sat night). Wind will be generally light.

Friday
14
Saturday
15
Sunday
16
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)
2
0
0
0
0
1
1
0
0
0
0
0
0
0
0
1
1
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)
1.2
E
10
1.2
E
10
1.2
E
10
1.3
E
10
1.2
E
10
1.1
E
10
0.9
E
10
0.9
E
10
1.3
E
10
1.5
E
10
1.5
E
10
1.4
ESE
10
1.4
ESE
10
1.4
ESE
10
1.2
ESE
10
1.3
ESE
10
1.2
ESE
10
1.1
E
10
1.1
E
10
1.1
ESE
10
1.1
ESE
8
1.1
ESE
10
Wave Graph
Metric surfscale
Energy kJ
305
300
300
352
300
247
162
159
325
426
440
386
386
356
282
307
294
245
231
235
171
230
Wind (km/h)
15
NNE
15
NE
15
ESE
15
SE
15
ESE
10
ENE
10
ENE
15
NE
20
NE
20
ENE
15
ESE
20
ESE
20
ESE
20
ESE
15
E
10
ENE
15
NE
20
ENE
15
E
15
ESE
15
ESE
15
ESE
Wind State
cross-off
cross
cross-on
on
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross-on
on
cross-on
cross-on
cross
cross
cross-on
cross-on
on
on
cross-on
High Tide
5:35AM1.70m
6:33PM1.72m
6:13AM1.71m
6:57PM1.75m
6:53AM1.68m
7:24PM1.76m
Low Tide
12:10PM0.34m
00:30AM0.73m
12:39PM0.39m
1:04AM0.65m
1:08PM0.48m
clear
clear
clear
part cloud
thunderstorm
thunderstorm
thunderstorm
part cloud
thunderstorm
thunderstorm
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:05
5:05
5:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:36
6:35
 mm
1
1
1
2
1
Temp °C
24
27
29
29
28
26
25
25
25
27
28
28
27
26
25
25
24
26
27
28
27
26
Feels °C
25
28
31
31
30
29
27
27
26
28
29
28
28
27
27
27
25
26
27
29
28
27
  • 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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