Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 8 pm 14 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
27.4° 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 (15 Aug):

  • Morning surf: Morning surf (15 Aug, local time) - 5ft (1.5m), 10s period with E swell.
  • Afternoon surf: Afternoon surf (15 Aug, local time) - 4.5ft (1.4m), 10s period with ESE swell.
  • Evening surf: Evening surf (15 Aug, local time) - 4.5ft (1.3m), 10s period with ESE swell.

The current surf forecast for Katahama at 5AM is: 1.2m 10s primary swell from a East direction (forecast issued at 08:00pm August 14). An open ocean swell of 0.7m 9s is not directed at the surf break, a second open ocean swell of 0.5m 11s is not directed at the surf break. The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (15 Aug)5ft (1.5m)10s
Afternoon (15 Aug)4.5ft (1.4m)10s
Evening (15 Aug)4.5ft (1.3m)10s

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


Short Range Forecast

Light rain (total 5mm), mostly falling on Fri night. Warm (max 28°C on Sat afternoon, min 24°C on Sat night). Wind will be generally light.

Fri
14
Saturday
15
Sunday
16
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
1
1
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.3
E
10
1.2
E
10
1.1
E
10
0.9
E
10
1.2
E
10
1.5
E
10
1.5
E
10
1.4
ESE
10
1.4
ESE
10
1.3
ESE
10
1.2
ESE
10
1.2
ESE
10
1.2
E
10
0.7
E
10
1.1
E
10
1
ESE
10
1.1
ESE
9
1.1
ESE
9
Wave Graph
Metric surfscale
Energy kJ
352
294
242
159
277
426
431
386
386
342
276
294
284
98
240
209
189
202
Wind (km/h)
10
E
10
ENE
10
NE
15
NE
15
NE
20
E
15
ESE
20
ESE
20
ESE
20
ESE
15
E
15
ENE
15
NE
20
ENE
15
E
15
ESE
15
ESE
15
ESE
Wind State
cross-on
cross
cross
cross
cross
cross-on
cross-on
cross-on
on
cross-on
cross-on
cross
cross
cross
cross-on
cross-on
on
cross-on
High Tide
6:33PM1.72m
6:13AM1.71m
6:57PM1.75m
6:53AM1.68m
7:24PM1.76m
Low Tide
00:30AM0.73m
12:39PM0.39m
1:04AM0.65m
1:08PM0.48m
thunderstorm
thunderstorm
clear
thunderstorm
thunderstorm
thunderstorm
part cloud
part cloud
part cloud
part cloud
thunderstorm
part cloud
part cloud
part cloud
part cloud
cloud
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:05
5:07
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:36
6:35
 mm
2
1
1
1
1
1
Temp °C
27
26
25
25
25
27
27
28
27
26
25
25
24
26
27
27
27
26
Feels °C
29
29
27
27
26
28
28
28
28
27
27
27
25
26
27
28
29
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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