Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 08 Sep 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
27.1°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 (08 Sep):

  • Morning surf: Morning surf (08 Sep, local time) - 6.5ft (2.0m), 9s period with S swell.
  • Afternoon surf: Afternoon surf (08 Sep, local time) - 3.5ft (1.0m), 8s period with SE swell.
  • Evening surf: Evening surf (08 Sep, local time) - 1ft (0.3m), 10s period with ESE swell.

The current surf forecast for Katahama at 11AM is: 2.0m 9s primary swell from a South direction (forecast issued at 02:00am September 08). An open ocean swell of 0.7m 10s is not directed at the surf break. The wind direction is predicted to be onshore.

Time (JST) & DateWave HeightWave Period
Morning (08 Sep)6.5ft (2.0m)9s
Afternoon (08 Sep)3.5ft (1.0m)8s
Evening (08 Sep)1ft (0.3m)10s

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


Short Range Forecast

Heavy rain (total 76mm), heaviest during Wed night. Warm (max 28°C on Tue morning, min 21°C on Wed night). Wind will be generally light.

Tuesday
8
Wednesday
9
Thursday
10
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)
3
3
3
3
2
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
Height Map
Wave
Height (m)
Direction
Period (s)
2.4
S
9
2.3
S
9
2.1
S
9
2
S
9
2
S
9
1
SE
8
1
SE
8
0.3
ESE
10
0.3
E
9
0.3
E
9
0.4
ESE
10
0.3
ESE
10
0.2
E
17
0.2
E
17
0.2
E
16
0.2
E
16
0.2
E
16
0.2
E
16
1.1
E
5
1
ENE
6
1.1
E
6
0.3
ESE
15
1.2
E
6
1.3
S
8
Wave Graph
Metric surfscale
Energy kJ
950
865
716
637
649
125
125
20
13
14
32
19
23
22
21
21
21
21
64
67
82
42
102
228
Wind (km/h)
5
NE
5
WNW
0
NNW
5
E
5
SSE
10
S
10
S
10
SSW
15
SW
20
SW
20
SW
20
SW
25
SW
20
SW
10
SW
5
SSW
15
SE
25
ENE
25
NE
25
NE
25
NE
25
NE
20
NE
20
NE
Wind State
glassy
glassy
glassy
glassy
cross-on
cross-on
cross-on
cross
cross
cross
cross
cross-off
cross-off
cross
cross
cross-on
on
cross
cross
cross
cross
cross
cross
cross
High Tide
2:51AM1.44m
4:35PM1.60m
3:41AM1.53m
4:55PM1.64m
4:20AM1.61m
5:12PM1.68m
Low Tide
10:00PM1.10m
9:47AM0.49m
10:29PM0.99m
10:23AM0.46m
10:52PM0.87m
10:53AM0.46m
light rain
rain showers
rain showers
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
mod rain
light rain
cloud
cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:24
5:24
5:24
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:05
6:02
6:01
 mm
3
5
2
1
2
4
7
7
6
5
3
3
3
4
5
5
10
8
1
Temp °C
24
24
25
27
28
28
27
27
26
26
27
28
28
28
27
27
26
21
21
21
21
21
21
21
Feels °C
29
29
30
32
33
32
31
31
29
28
30
30
29
31
31
31
29
20
20
20
20
20
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 

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