Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 13 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 (13 Aug):

  • Morning surf: Morning surf (13 Aug, local time) - 2.5ft (0.7m), 9s period with E swell.
  • Afternoon surf: Afternoon surf (13 Aug, local time) - 2.5ft (0.8m), 10s period with E swell.
  • Evening surf: Evening surf (13 Aug, local time) - 3ft (0.9m), 11s period with E swell.

The current surf forecast for Katahama at 5AM is: 0.6m 9s primary swell from a East direction and 0.8m 4s secondary swell from a East direction (forecast issued at 02:00am August 13). An open ocean swell of 1.0m 10s is not directed at the surf break. The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (13 Aug)2.5ft (0.7m)9s
Afternoon (13 Aug)2.5ft (0.8m)10s
Evening (13 Aug)3ft (0.9m)11s

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


Short Range Forecast

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

Thursday
13
Friday
14
Saturday
15
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
0
0
0
1
1
1
2
0
0
0
0
0
1
1
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)
0.6
E
10
0.6
E
9
0.6
E
9
0.7
E
9
0.7
E
10
0.8
E
10
0.8
E
10
0.9
E
11
0.9
E
11
1.1
E
10
1.1
E
10
1.1
E
10
1.3
E
10
0.9
E
10
0.9
E
10
0.9
E
10
1.1
E
10
0.9
E
10
1.2
E
10
1.4
E
10
1.5
E
10
1.4
ESE
10
1.4
ESE
10
1.3
ESE
9
Wave Graph
Metric surfscale
Energy kJ
64
60
60
85
87
113
121
178
178
262
252
252
352
168
168
165
242
162
282
379
440
386
386
302
Wind (km/h)
15
ENE
15
NE
15
NE
20
NE
15
E
15
SE
15
ESE
10
E
15
NE
15
NE
15
NNE
20
ENE
15
E
15
ESE
15
ESE
10
E
10
ENE
15
NE
15
ENE
20
ENE
15
ESE
20
SE
20
ESE
15
ESE
Wind State
cross
cross
cross
cross
cross-on
on
on
cross-on
cross
cross
cross-off
cross
cross-on
on
cross-on
cross-on
cross
cross
cross
cross-on
cross-on
on
on
cross-on
High Tide
4:58AM1.66m
6:11PM1.68m
5:35AM1.70m
6:33PM1.72m
6:13AM1.71m
6:57PM1.75m
Low Tide
11:35PM0.94m
11:43AM0.31m
00:01AM0.83m
12:10PM0.34m
00:30AM0.73m
12:39PM0.39m
thunderstorm
rain showers
part cloud
part cloud
clear
clear
thunderstorm
thunderstorm
thunderstorm
clear
clear
clear
clear
clear
thunderstorm
thunderstorm
clear
part cloud
part cloud
thunderstorm
clear
clear
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:05
5:05
5:05
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:37
6:36
 mm
1
1
1
1
1
1
1
1
Temp °C
25
24
24
26
29
29
28
26
25
25
24
28
29
29
28
27
26
25
26
27
28
28
27
26
Feels °C
26
25
25
26
30
31
30
29
27
27
25
28
30
30
30
30
29
27
27
28
29
28
27
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 

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