Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 23 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
26.8°C
0.7° 

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 (23 Aug):

  • Morning surf: Morning surf (23 Aug, local time) - 2ft (0.6m), 10s period with E swell.
  • Afternoon surf: Afternoon surf (23 Aug, local time) - 1.5ft (0.4m), 12s period with ESE swell.
  • Evening surf: Evening surf (23 Aug, local time) - 2ft (0.6m), 12s period with SSE swell.

The current surf forecast for Katahama at 9AM is: 0.6m 10s primary swell from a East direction (forecast issued at 02:00am August 23). An open ocean swell of 0.8m 8s is not directed at the surf break. The wind direction is predicted to be cross-onshore.

Time (JST) & DateWave HeightWave Period
Morning (23 Aug)2ft (0.6m)10s
Afternoon (23 Aug)1.5ft (0.4m)12s
Evening (23 Aug)2ft (0.6m)12s

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


Short Range Forecast

Mostly dry. Warm (max 29°C on Tue morning, min 25°C on Sun night). Wind will be generally light.

Sunday
23
Monday
24
Tuesday
25
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)
1
1
1
0
0
0
0
1
1
2
3
3
2
3
2
4
4
4
5
4
2
2
4
4
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)
0.7
E
11
0.6
E
10
0.5
E
10
0.6
E
10
0.5
E
10
0.4
ESE
12
0.5
SE
12
0.6
SSE
12
0.6
SSE
13
0.6
SSE
17
0.9
SSE
16
1
SSE
17
1.6
SSE
16
1.6
SSE
15
2.1
SSE
15
2.3
SSE
16
2.4
SSE
15
2.5
SSE
15
2.5
SSE
15
2.5
SSE
14
2.5
SSE
14
2.5
S
14
2.5
S
14
2.5
S
13
Wave Graph
Metric surfscale
Energy kJ
108
71
47
71
48
49
73
98
108
186
407
629
1289
1162
1953
2582
2576
2746
2991
3009
2866
2694
2659
2199
Wind (km/h)
5
SW
5
NW
5
NNE
5
E
15
SSE
10
SSE
5
SE
0
E
5
W
5
NW
0
NW
5
SSW
15
SSW
15
SSW
15
SW
10
WSW
10
WSW
10
WSW
10
WSW
15
SW
20
SSW
20
SSW
15
WSW
10
WSW
Wind State
glassy
glassy
glassy
cross-on
on
cross-on
on
glassy
glassy
off
glassy
glassy
cross-on
cross
cross
cross-off
cross-off
cross-off
cross-off
cross
cross
cross
cross-off
cross-off
High Tide
00:41AM1.39m
4:19PM1.48m
2:17AM1.43m
4:45PM1.55m
3:17AM1.50m
5:06PM1.61m
Low Tide
8:42AM0.55m
9:44PM1.21m
9:38AM0.47m
10:24PM1.11m
10:18AM0.41m
thunderstorm
cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
part cloud
clear
part cloud
clear
clear
clear
clear
part cloud
part cloud
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:11
5:13
5:13
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:25
6:24
6:23
 mm
1
Temp °C
27
26
26
27
27
27
27
26
26
25
25
27
27
28
28
27
26
26
26
28
29
29
28
27
Feels °C
32
31
31
31
30
30
31
31
31
29
30
31
29
30
30
30
30
30
30
31
30
30
30
31
  • 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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