Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 8 am 28 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
27.8°C
0.3° 

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 (28 Aug):

  • Morning surf: Morning surf (28 Aug, local time) - 2.5ft (0.7m), 9s period with S swell.
  • Afternoon surf: Afternoon surf (28 Aug, local time) - 1.5ft (0.5m), 12s period with E swell.
  • Evening surf: Evening surf (28 Aug, local time) - 1.5ft (0.4m), 12s period with E swell.

The current surf forecast for Katahama at 1PM is: 0.8m 8s primary swell from a South direction (forecast issued at 08:00am August 28). An open ocean swell of 1.1m 9s is not directed at the surf break, a second open ocean swell of 1.0m 6s is not directed at the surf break. The wind direction is predicted to be cross-offshore.

Time (JST) & DateWave HeightWave Period
Morning (28 Aug)2.5ft (0.7m)9s
Afternoon (28 Aug)1.5ft (0.5m)12s
Evening (28 Aug)1.5ft (0.4m)12s

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


Short Range Forecast

Heavy rain (total 20mm), heaviest during Fri morning. Warm (max 28°C on Sat afternoon, min 22°C on Sat night). Wind will be generally light.

Friday
28
Saturday
29
Sunday
30
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)
1
1
1
0
0
0
1
1
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)
0.5
E
13
0.7
S
9
0.8
S
8
0.5
E
12
0.5
E
12
0.4
E
12
1
SW
6
1
SW
6
0.4
E
12
0.4
E
12
0.4
E
12
0.4
E
12
0.4
E
11
0.4
E
11
0.9
E
5
0.7
E
5
0.7
ENE
5
0.3
E
11
0.4
E
5
0.3
E
11
0.3
E
11
0.3
E
11
Wave Graph
Metric surfscale
Energy kJ
79
74
86
74
71
44
62
67
43
42
42
42
41
39
37
24
28
22
9
22
22
22
Wind (km/h)
15
W
10
NW
5
SW
20
WSW
20
W
10
W
5
NW
5
WNW
0
NNW
0
NNE
5
SSE
10
S
15
SE
15
E
10
ENE
10
NE
10
ENE
5
ENE
10
ESE
10
SE
10
ESE
5
ENE
Wind State
cross-off
off
glassy
cross-off
cross-off
cross-off
off
glassy
glassy
glassy
cross-on
cross-on
on
cross-on
cross
cross
cross
cross-on
on
on
cross-on
cross-on
High Tide
5:15AM1.69m
6:02PM1.73m
5:51AM1.72m
6:23PM1.76m
6:28AM1.72m
6:48PM1.79m
Low Tide
11:45AM0.41m
00:04AM0.69m
12:11PM0.45m
00:33AM0.59m
12:38PM0.51m
mod rain
thunderstorm
heavy rain
cloud
cloud
cloud
cloud
cloud
part cloud
thunderstorm
part cloud
part cloud
thunderstorm
light rain
cloud
cloud
cloud
cloud
part cloud
part cloud
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:16
5:16
5:16
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:20
6:17
6:16
 mm
7
3
14
1
1
1
Temp °C
25
24
24
25
26
26
25
25
25
27
27
28
26
24
22
22
23
23
25
25
25
25
Feels °C
28
27
29
26
28
30
29
29
30
32
31
32
29
26
24
24
26
26
28
28
29
29
  • 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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