Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 8 am 07 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
26.9° C
0.5° 

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 (07 Aug):

  • Morning surf: Morning surf (07 Aug, local time) - 8ft (2.5m), 12s period with S swell.
  • Afternoon surf: Afternoon surf (07 Aug, local time) - 7.5ft (2.3m), 12s period with S swell.
  • Evening surf: Evening surf (07 Aug, local time) - 3.5ft (1.1m), 9s period with ESE swell.

The current surf forecast for Katahama at 12PM is: 2.5m 12s primary swell from a South direction and 1.1m 10s secondary swell from a East-southeast direction (forecast issued at 08:00am August 07). The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (07 Aug)8ft (2.5m)12s
Afternoon (07 Aug)7.5ft (2.3m)12s
Evening (07 Aug)3.5ft (1.1m)9s

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


Short Range Forecast

Light rain (total 2mm), mostly falling on Sun night. Warm (max 29°C on Fri morning, min 24°C on Sun night). Wind will be generally light.

Friday
7
Saturday
8
Sunday
9
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)
3
2
1
2
0
1
1
1
1
0
0
0
0
2
3
3
3
2
1
0
2
3
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)
2.5
S
13
2.5
S
12
2.5
S
12
2.3
S
12
1.1
ESE
9
1.1
ESE
9
1.1
ESE
9
1
ESE
9
0.9
ESE
9
0.9
ESE
9
0.9
ESE
10
0.9
ESE
10
1.1
ESE
12
1.3
ESE
13
1.4
ESE
13
1.5
ESE
14
1.5
ESE
14
1.6
ESE
13
1.6
ESE
13
1.5
E
13
1.4
ESE
13
1.4
ESE
13
Wave Graph
Metric surfscale
Energy kJ
2408
2032
1776
1444
197
197
201
189
156
156
166
173
344
522
594
838
780
849
836
799
679
638
Wind (km/h)
15
NE
15
E
15
SE
15
SE
10
SE
10
ESE
5
E
10
ESE
5
ESE
5
E
15
SE
15
SSE
10
SSE
5
SSE
0
SSE
5
NW
5
NNE
10
ESE
15
SSE
15
S
10
SSW
0
SW
Wind State
cross
cross-on
on
on
on
on
cross-on
on
glassy
cross-on
on
on
cross-on
on
glassy
glassy
glassy
on
cross-on
cross-on
cross
glassy
High Tide
3:02PM1.27m
00:04AM1.44m
4:11PM1.39m
1:39AM1.44m
4:46PM1.49m
Low Tide
6:50AM0.62m
6:01PM1.23m
8:19AM0.55m
8:50PM1.25m
9:22AM0.46m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:00
5:01
5:01
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:44
6:43
6:42
 mm
Temp °C
26
28
29
29
28
27
26
26
25
27
29
28
27
26
26
25
25
27
28
28
27
26
Feels °C
28
30
31
31
31
31
30
30
29
30
30
30
30
30
31
29
29
30
30
29
30
30
  • 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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