Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 18 Sep 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
25.7°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 (18 Sep):

  • Morning surf: Morning surf (18 Sep, local time) - 0.5ft (0.1m), 12s period with SE swell.
  • 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 8AM is: 0.1m 12s primary swell from a Southeast direction and 0.1m 9s secondary swell from a Southeast direction (forecast issued at 02:00am September 18). An open ocean swell of 1.8m 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)0.5ft (0.1m)12s
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 51mm), heaviest during Sun night. Warm (max 26°C on Sat morning, min 22°C on Fri morning). Mainly fresh winds.

Friday
18
Saturday
19
Sunday
20
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
0
0
0
0
0
0
0
0
2
3
3
!
!
!
!
2
2
!
!
!
!
!
!
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)
0.1
SE
9
0.1
SE
9
0.1
S
13
0.1
SE
12
0.2
SSE
12
0.1
SE
12
0.2
SSE
11
0.4
SE
14
0.8
SE
14
1.4
SE
14
1.5
SE
16
2.5
SE
15
3
SE
14
3
SE
14
3
ESE
13
3
SE
13
2.5
ESE
12
2.5
ESE
12
3
SE
12
3
SE
12
3
SE
12
3.5
SE
13
4
SE
13
3.5
SE
13
Wave Graph
Metric surfscale
Energy kJ
3
3
3
6
14
5
12
52
265
715
1123
3103
3757
3391
3247
2590
2081
1888
2271
2878
2895
4284
4696
4443
Wind (km/h)
30
ENE
30
NE
30
NE
30
NE
25
ENE
20
ENE
25
ENE
30
ENE
25
NE
20
NNE
20
NE
25
NE
25
ENE
20
ENE
20
NE
20
NE
20
NE
20
NE
15
NNE
25
NE
30
NE
35
NE
30
NNE
30
NNE
Wind State
cross
cross
cross
cross
cross
cross
cross-on
cross
cross
cross-off
cross-off
cross
cross
cross
cross
cross
cross
cross
cross-off
cross
cross
cross
cross-off
cross-off
High Tide
10:22AM1.32m
8:46PM1.52m
1:24PM1.31m
9:42PM1.39m
2:57PM1.42m
Low Tide
3:29AM0.55m
2:53PM1.15m
4:47AM0.62m
4:45PM1.27m
6:32AM0.65m
8:29PM1.23m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
clear
part cloud
cloud
cloud
cloud
cloud
cloud
light rain
cloud
light rain
heavy rain
heavy rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:31
5:31
5:31
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:51
5:49
5:47
 mm
4
2
13
11
Temp °C
22
21
21
22
24
25
24
23
23
22
22
24
26
26
25
24
24
24
24
23
23
23
22
22
Feels °C
19
17
17
18
21
23
21
20
21
20
20
22
25
26
25
24
24
25
25
22
21
21
20
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.


Nearest locationNearest