Katahama Surf Break

Lat Long: 34.72° N 138.22° E

Katahama 48 hour detailed Surf Forecast

Issued: 2 am 10 Aug 2026 (local time)

Forecast update in  hr  min

Today's Katahama sea temperature is
26.9° C
0.6° 

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 (10 Aug):

  • Morning surf: Morning surf (10 Aug, local time) - 4.5ft (1.4m), 12s period with E swell.
  • Afternoon surf: Afternoon surf (10 Aug, local time) - 5ft (1.5m), 12s period with E swell.
  • Evening surf: Evening surf (10 Aug, local time) - 4.5ft (1.4m), 11s period with E swell.

The current surf forecast for Katahama at 5AM is: 1.3m 12s primary swell from a East direction (forecast issued at 02:00am August 10). An open ocean swell of 1.4m 12s is not directed at the surf break. The wind direction is predicted to be glassy and the swell rating is 3.

Time (JST) & DateWave HeightWave Period
Morning (10 Aug)4.5ft (1.4m)12s
Afternoon (10 Aug)5ft (1.5m)12s
Evening (10 Aug)4.5ft (1.4m)11s

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


Short Range Forecast

Heavy rain (total 23mm), heaviest during Mon night. Warm (max 27°C on Mon morning, min 22°C on Tue night). Wind will be generally light.

Monday
10
Tuesday
11
Wednesday
12
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
1
3
3
1
2
2
2
1
3
2
1
0
0
1
2
1
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)
1.4
E
12
1.3
E
12
1.3
E
12
1.4
E
12
1.4
E
12
1.5
E
12
1.4
E
12
1.4
E
11
1.4
E
11
1.5
E
11
1.4
E
10
1.4
E
10
1.4
E
11
1.3
E
12
1.3
E
12
1.2
E
12
1.1
E
12
0.7
SSE
3
0.8
E
11
0.7
E
11
0.7
E
10
1.3
ESE
10
1.2
E
10
0.6
E
10
Wave Graph
Metric surfscale
Energy kJ
593
497
505
584
556
628
538
502
459
517
426
410
457
454
454
387
336
10
152
110
100
342
273
65
Wind (km/h)
5
SE
10
ENE
5
NNE
0
SSE
15
SSW
15
SSW
10
SSW
5
SSE
5
SSE
0
WSW
5
SSE
10
SE
15
SSW
15
SSW
5
SW
10
NNE
5
SSE
20
E
20
ENE
20
NE
25
ENE
25
ENE
25
ENE
20
ENE
Wind State
glassy
cross-on
glassy
glassy
cross-on
cross
cross
cross-on
on
glassy
glassy
on
cross-on
cross-on
cross
cross-off
on
cross-on
cross
cross
cross-on
cross
cross-on
cross-on
High Tide
2:47AM1.48m
5:12PM1.55m
3:38AM1.54m
5:33PM1.60m
4:20AM1.60m
5:51PM1.64m
Low Tide
10:05PM1.19m
10:08AM0.39m
10:43PM1.12m
10:44AM0.34m
11:10PM1.03m
11:15AM0.31m
thunderstorm
thunderstorm
thunderstorm
clear
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
cloud
cloud
thunderstorm
light rain
light rain
light rain
cloud
light rain
rain showers
cloud
cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:03
5:03
5:03
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:40
6:39
6:38
 mm
1
5
1
1
1
3
3
2
3
1
1
1
1
2
1
1
2
Temp °C
26
24
25
27
27
27
27
25
24
24
23
23
24
25
25
25
24
23
22
23
24
24
25
25
Feels °C
31
27
29
32
29
29
30
28
28
29
27
26
26
27
28
28
26
23
22
22
22
22
23
24
  • 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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