Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 8 am 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
26.8°C
0.4° 

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 (04 Sep):

  • Morning surf: Morning surf (04 Sep, local time) - 1.5ft (0.5m), 9s period with SE swell.
  • Afternoon surf: Afternoon surf (04 Sep, local time) - 1.5ft (0.4m), 9s period with E swell.
  • Evening surf: Evening surf (04 Sep, local time) - 1.5ft (0.4m), 6s period with ESE swell.

The current surf forecast for Katahama at 12PM is: 0.4m 9s primary swell from a East direction and 0.4m 6s secondary swell from a East-southeast direction (forecast issued at 08:00am September 04). An open ocean swell of 1.1m 10s is not directed at the surf break. The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (04 Sep)1.5ft (0.5m)9s
Afternoon (04 Sep)1.5ft (0.4m)9s
Evening (04 Sep)1.5ft (0.4m)6s

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


Short Range Forecast

Heavy rain (total 108mm), heaviest during Sun night. Warm (max 27°C on Fri morning, min 20°C on Sun morning). Winds increasing (calm on Fri afternoon, strong winds from the NE by Sun afternoon).

Friday
4
Saturday
5
Sunday
6
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
0
0
0
0
0
0
0
0
0
0
0
0
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)
0.4
E
10
0.5
SE
9
0.4
E
9
0.4
E
9
0.4
ESE
6
0.4
ESE
6
0.4
E
9
0.5
SE
9
0.3
E
9
1
E
5
1.1
E
6
1.4
E
6
0.1
E
13
0.3
S
8
0.3
S
8
0.3
S
8
0.1
SE
12
0.3
SSE
8
0.4
SSE
8
0.4
SSE
10
0.9
SSE
10
1.5
S
11
Wave Graph
Metric surfscale
Energy kJ
30
41
27
27
16
16
26
39
16
58
75
121
3
11
11
12
6
13
28
31
157
576
Wind (km/h)
10
WNW
10
NE
10
ESE
5
SSE
5
NNW
10
NNE
15
N
20
NE
20
NE
20
NE
25
NE
25
ENE
25
NE
25
ENE
30
NE
35
ENE
40
NE
40
ENE
40
NE
40
NE
45
NE
45
NE
Wind State
cross-off
cross
on
glassy
cross-off
cross-off
cross-off
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
cross
High Tide
11:47AM1.25m
9:34PM1.48m
2:56PM1.34m
11:09PM1.37m
3:44PM1.45m
Low Tide
4:27AM0.62m
3:30PM1.19m
6:01AM0.65m
6:23PM1.30m
7:46AM0.62m
rain showers
cloud
cloud
thunderstorm
thunderstorm
light rain
light rain
mod rain
rain showers
rain showers
cloud
part cloud
cloud
cloud
cloud
cloud
cloud
light rain
mod rain
heavy rain
heavy rain
heavy rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:20
5:22
5:22
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:09
6:08
6:07
 mm
1
3
1
1
2
7
3
1
1
8
12
11
25
Temp °C
24
26
27
26
26
24
22
21
22
23
23
23
23
23
23
23
23
22
20
21
21
21
Feels °C
27
29
30
30
30
25
22
21
22
23
22
21
21
21
19
18
18
16
15
16
16
16
  • 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 

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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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