Katahama Surf Break

Katahama 48 hour detailed Surf Forecast

Lat Long: 34.72° N 138.22° E

Issued: 2 am 18 Jun 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
21.2° C

2.2°C colder than average for this time of year

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 Jun):

  • Morning surf: Morning surf (18 Jun, local time) - 2.5ft (0.7m), 6s period with SE swell.
  • Afternoon surf: Afternoon surf (18 Jun, local time) - 3.5ft (1.1m), 7s period with SE swell.
  • Evening surf: Evening surf (18 Jun, local time) - 3.5ft (1.0m), 7s period with SSE swell.

The current surf forecast for Katahama at 9AM is: 0.7m 6s primary swell from a Southeast direction and 0.6m 4s secondary swell from a Northeast direction (forecast issued at 02:00am June 18). An open ocean swell of 1.2m 7s is not directed at the surf break. The wind direction is predicted to be cross-shore.

Time (JST) & DateWave HeightWave Period
Morning (18 Jun)2.5ft (0.7m)6s
Afternoon (18 Jun)3.5ft (1.1m)7s
Evening (18 Jun)3.5ft (1.0m)7s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Heavy rain (total 47mm), heaviest during Sat afternoon. Warm (max 25°C on Thu afternoon, min 20°C on Sat afternoon). Mainly fresh winds.

Thursday
18
Friday
19
Saturday
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
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
Height Map
Wave
Height (m)
Direction
Period (s)
1
SE
6
0.3
E
9
0.8
NE
4
0.7
SE
6
0.4
SE
8
1.1
SE
7
0.9
SE
8
1
SSE
7
0.9
SSE
6
0.8
SSE
6
0.7
SSE
6
0.2
SSE
10
0.4
SE
10
0.4
SE
10
0.3
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
1.1
SSE
6
Wave Graph
Metric surfscale
Energy kJ
58
13
16
37
26
106
99
88
62
45
33
10
25
25
16
25
25
24
24
24
24
24
34
69
Wind (km/h)
20
NNE
25
NE
20
NNE
15
NE
15
WSW
30
WSW
25
WSW
20
WSW
10
W
5
NNW
5
NNE
15
E
10
SSE
15
SE
10
SE
10
ESE
10
NE
15
ENE
15
ENE
20
ENE
15
ENE
20
ENE
15
ENE
15
ENE
Wind State
cross-off
cross
cross-off
cross
cross-off
cross-off
cross-off
cross-off
cross-off
glassy
cross-off
cross-on
on
on
on
on
cross
cross
cross
cross
cross
cross
cross-on
cross
High Tide
6:19AM1.57m
8:11PM1.54m
7:06AM1.51m
8:52PM1.54m
7:58AM1.41m
Low Tide
00:58AM0.97m
1:20PM0.17m
1:49AM0.93m
2:02PM0.26m
2:47AM0.90m
2:47PM0.38m
heavy rain
heavy rain
heavy rain
light rain
clear
part cloud
clear
part cloud
part cloud
part cloud
clear
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
part cloud
cloud
cloud
light rain
light rain
heavy rain
mod rain
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:33
4:33
4:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:01
7:01
7:02
 mm
12
11
16
1
1
5
11
9
Temp °C
19
19
19
21
24
25
23
23
22
22
21
23
24
23
23
22
22
22
21
22
21
20
20
20
Feels °C
18
17
18
21
25
23
22
24
24
26
23
24
26
24
25
24
24
23
21
22
21
20
21
21
Swell 1
Height (m)
Direction
Period (s)
1.3
SSW
8
1.9
SSW
8
1.5
SSW
7
1.2
SSW
7
1.4
S
7
1.1
SE
7
0.9
SE
8
1
SSE
7
1.3
SW
8
1.1
SW
8
1
SW
8
1.1
SSW
8
1.3
SSW
8
1.2
SW
8
1.1
SW
8
1
SW
8
0.9
SW
8
0.9
SW
7
0.9
SW
7
0.9
SW
7
0.8
SW
7
0.8
SW
6
0.6
SW
6
0.4
SE
10
Energy kJ
178
408
249
134
181
106
99
88
214
165
123
153
235
187
163
125
96
79
77
67
52
47
31
24
Swell 2
Height (m)
Direction
Period (s)
1
SE
6
0.3
E
9
0.1
SE
10
0.7
SE
6
0.4
SE
8
0.1
SE
16
0.1
SE
15
0.2
E
10
0.9
SSE
6
0.8
SSE
6
0.7
SSE
6
0.4
SW
10
0.4
SE
10
0.4
SE
6
0.3
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
0.4
SE
10
0.7
E
5
0.4
SE
10
0.1
SE
12
Energy kJ
58
13
4
37
24
10
9
8
62
45
33
26
25
8
16
25
25
24
24
24
24
23
24
6
Swell 3
Height (m)
Direction
Period (s)
0.3
E
9
0.1
SE
10
0.1
SE
12
0.4
SE
8
0.3
NE
3
0.3
ENE
10
0.3
ENE
10
0.1
SE
11
0.2
SSE
11
0.2
SSE
11
0.2
SSE
10
0.2
SSE
10
0.1
SE
14
0.4
SE
10
0.2
E
8
0.1
SE
13
0.1
SE
13
0.1
SE
13
0.1
E
8
0.1
SE
13
0.1
SE
13
0.4
SE
10
0.1
SE
12
0.1
E
10
Energy kJ
14
4
6
16
2
19
18
5
12
11
10
10
8
25
5
7
7
7
1
7
6
24
6
2
Wind waves
Height (m)
Direction
Period (s)
2
SSW
8
0.8
NE
4
0.6
NE
4
0.8
ENE
4
1.7
SW
9
1.9
SW
9
1.6
SW
9
0.3
ENE
2
0.5
ENE
3
0.7
E
4
0.7
E
4
0.8
ESE
5
1.1
SSE
6
Energy kJ
447
16
9
26
481
573
351
1
5
14
17
34
69
Nearest Offshore or Glassy
Rating
(10 max)
1
1
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
2
1
1
Distance (km)
351
150
150
13
6
65
127
6
2
2
2
13
104
104
13
104
236
150
150
386
903
903
706
13
Best forecast wave conditions in Shizuoka
Rating
(10 max)
1
1
1
1
2
1
1
1
1
1
Best forecast wave conditions in Japan
Rating
(10 max)
1
2
2
3
1
2
2
2
2
2
2
1
1
1
1
1
1
1
1
1
2
2
Header Global
Rating
(10 max)
4
4
5
5
5
9
9
9
5
5
5
5
6
6
6
5
9
5
4
5
4
4
4
5
  • 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
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