Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 20 Jul 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
26.5° C
0.0° 

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 (20 Jul):

  • Morning surf: Morning surf (20 Jul, local time) - 2.5ft (0.7m), 9s period with E swell.
  • Afternoon surf: Afternoon surf (20 Jul, local time) - 2ft (0.6m), 9s period with E swell.
  • Evening surf: Evening surf (20 Jul, local time) - 2ft (0.6m), 9s period with E swell.

The current surf forecast for Katahama at 6AM is: 0.6m 9s primary swell from a East direction (forecast issued at 02:00am July 20). An open ocean swell of 0.3m 6s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (JST) & DateWave HeightWave Period
Morning (20 Jul)2.5ft (0.7m)9s
Afternoon (20 Jul)2ft (0.6m)9s
Evening (20 Jul)2ft (0.6m)9s

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


Short Range Forecast

Mostly dry. Warm (max 31°C on Tue afternoon, min 26°C on Mon night). Wind will be generally light.

Monday
20
Tuesday
21
Wednesday
22
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
1
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
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
9
0.6
E
9
0.6
E
9
0.7
E
9
0.6
E
9
0.6
E
9
0.6
E
9
0.6
E
9
0.5
E
10
0.5
E
11
0.5
E
11
0.6
E
11
0.6
E
11
0.6
E
11
0.7
SW
4
0.2
SSE
8
0.7
SW
5
0.7
SW
5
0.2
ESE
11
0.2
ESE
11
0.7
SW
5
0.9
SW
4
1.1
SW
5
1.1
SW
5
Wave Graph
Metric surfscale
Energy kJ
80
58
58
79
57
57
55
52
45
59
59
84
82
82
16
6
21
22
11
11
23
32
58
68
Wind (km/h)
5
W
10
W
5
W
10
WSW
20
SW
20
SW
15
SW
15
WSW
10
WSW
10
W
5
W
5
SSW
15
S
15
SSW
15
SW
10
WSW
10
WSW
5
WSW
0
NW
5
SE
15
S
20
SSW
20
WSW
10
WSW
Wind State
cross-off
cross-off
cross-off
cross-off
cross
cross
cross-off
cross-off
cross-off
cross-off
glassy
cross-on
cross-on
cross
cross
cross-off
cross-off
glassy
glassy
glassy
cross-on
cross
cross-off
cross-off
High Tide
8:41AM1.42m
9:22PM1.63m
9:46AM1.29m
10:04PM1.58m
11:23AM1.19m
Low Tide
3:06AM0.72m
2:52PM0.61m
4:04AM0.70m
3:33PM0.78m
5:12AM0.68m
4:21PM0.95m
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:47
4:48
4:48
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:58
6:58
6:57
 mm
Temp °C
27
26
26
29
30
30
29
27
27
26
27
29
30
31
29
28
27
27
27
29
30
31
29
28
Feels °C
32
30
30
33
32
32
32
30
31
30
33
34
34
35
32
32
32
33
33
35
33
33
32
33
  • 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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