Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 19 Sep 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
25.8°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 (19 Sep):

  • Morning surf: Morning surf (19 Sep, local time) - 8ft (2.5m), 16s period with SE swell.
  • Afternoon surf: Afternoon surf (19 Sep, local time) - 10ft (3.0m), 14s period with SE swell.
  • Evening surf: Evening surf (19 Sep, local time) - 10ft (3.0m), 13s period with SE swell.

The current surf forecast for Katahama at 6AM is: 1.6m 16s primary swell from a Southeast direction and 1.6m 13s secondary swell from a Southeast direction (forecast issued at 02:00am September 19). An open ocean swell of 1.4m 8s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (JST) & DateWave HeightWave Period
Morning (19 Sep)8ft (2.5m)16s
Afternoon (19 Sep)10ft (3.0m)14s
Evening (19 Sep)10ft (3.0m)13s

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


Short Range Forecast

Moderate rain (total 19mm), heaviest on Mon afternoon. Warm (max 27°C on Mon afternoon, min 22°C on Sun morning). Mainly fresh winds.

Saturday
19
Sunday
20
Monday
21
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
2
3
3
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
!
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)
0.8
SE
14
1.4
SE
14
1.6
SE
16
2.5
SE
16
3
SE
14
3
SE
14
3
SE
13
3
SE
13
3
SE
13
3
SE
13
3
SE
12
3
SE
12
3
SE
12
3
ESE
12
3
SE
12
3.5
SE
12
3.5
SE
12
3.5
SSE
12
4
SSE
13
4
SSE
13
4.5
SE
13
4
SSE
13
4
SE
13
3.5
SE
12
Wave Graph
Metric surfscale
Energy kJ
265
715
1287
3499
4024
3996
3555
3284
3214
3020
2597
2680
2402
2281
2692
2943
3402
3392
5434
5751
6464
5664
5593
3120
Wind (km/h)
20
NE
20
NE
20
NNE
20
NE
20
NE
20
ENE
20
NE
20
NE
20
NE
20
NE
25
ENE
30
ENE
30
ENE
30
NE
35
NE
30
NE
30
NNE
35
NE
30
NE
30
NE
35
NE
35
NNE
10
N
10
W
Wind State
cross
cross-off
cross-off
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross-off
cross
cross
cross
cross
cross-off
cross-off
cross-off
High Tide
1:24PM1.31m
9:42PM1.39m
2:57PM1.42m
00:31AM1.31m
3:33PM1.51m
Low Tide
4:47AM0.62m
4:45PM1.27m
6:32AM0.65m
8:29PM1.23m
8:06AM0.62m
part cloud
part cloud
clear
part cloud
clear
part cloud
part cloud
cloud
cloud
cloud
cloud
cloud
light rain
cloud
cloud
light rain
light rain
light rain
rain showers
rain showers
rain showers
light rain
light rain
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:31
5:31
5:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:49
5:47
5:45
 mm
1
2
3
1
1
2
2
1
5
1
Temp °C
23
22
22
24
26
26
26
25
25
25
24
25
22
23
24
22
22
23
23
24
26
27
26
25
Feels °C
21
20
20
23
25
26
26
25
26
25
23
23
19
21
21
20
20
20
22
22
24
24
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.


Nearest locationNearest