Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 pm 18 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 (18 Sep):

  • Afternoon surf: Afternoon surf (18 Sep, local time) - 0.5ft (0.1m), 12s period with SE swell.
  • Evening surf: Evening surf (18 Sep, local time) - 1.5ft (0.4m), 14s period with SE swell.

The current surf forecast for Katahama at 7PM is: 0.3m 11s primary swell from a Southeast direction and 0.1m 10s secondary swell from a South direction (forecast issued at 02:00pm September 18). An open ocean swell of 1.9m 8s is not directed at the surf break. The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (18 Sep)--
Afternoon (18 Sep)0.5ft (0.1m)12s
Evening (18 Sep)1.5ft (0.4m)14s

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


Short Range Forecast

Heavy rain (total 44mm), heaviest during Sun night. Warm (max 26°C on Sat morning, min 22°C on Fri night). Winds decreasing (fresh winds from the ENE on Sun afternoon, light winds from the NNE by Mon morning).

Fri
18
Saturday
19
Sunday
20
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
2
3
3
!
!
!
!
!
!
!
!
!
0
!
!
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)
0.1
SE
12
0.1
SE
12
0.3
SE
11
0.4
SE
14
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
3.5
ESE
13
3
SE
12
3
SE
12
3.5
ESE
12
3
SE
12
3
SE
12
3
ESE
12
3
ESE
12
3.5
SE
13
Wave Graph
Metric surfscale
Energy kJ
6
6
20
72
265
715
1287
3499
3137
3601
3201
3772
2572
2449
3030
2541
2635
2839
2757
4022
Wind (km/h)
25
ENE
20
ENE
25
ENE
30
ENE
25
NE
20
NNE
20
NNE
20
NE
25
ENE
20
ENE
20
ENE
20
NE
25
ENE
30
NE
15
NE
25
NE
30
NE
35
ENE
30
ENE
30
NE
Wind State
cross
cross
cross
cross
cross
cross-off
cross-off
cross
cross
cross-on
cross
cross
cross
cross
cross-off
cross
cross
cross
cross
cross
High Tide
10:22AM1.32m
8:46PM1.52m
1:24PM1.31m
9:42PM1.39m
2:57PM1.42m
Low Tide
2:53PM1.15m
4:47AM0.62m
4:45PM1.27m
6:32AM0.65m
8:29PM1.23m
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
part cloud
cloud
cloud
cloud
light rain
cloud
light rain
light rain
light rain
light rain
heavy rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:31
5:31
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:51
5:49
5:47
 mm
2
1
1
1
4
14
Temp °C
25
25
24
23
23
22
22
23
26
26
25
24
25
23
23
23
25
24
23
22
Feels °C
22
23
21
19
21
20
20
21
25
26
24
24
25
22
24
22
23
21
21
20
  • 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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