Kugenuma Rivermouth Surf Break

Lat Long: 35.31° N 139.47° E

Kugenuma Rivermouth 48 hour detailed Surf Forecast

Issued: 8 pm 10 Aug 2026 (local time)

Forecast update in  hr  min

Today's Kugenuma Rivermouth sea temperature is
27.6° C
0.8° 

Kugenuma Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


How big are the waves at Kugenuma Rivermouth today (11 Aug):

  • Morning surf: Morning surf (11 Aug, local time) - 1.5ft (0.5m), 10s period with SSW swell.
  • Afternoon surf: Afternoon surf (11 Aug, local time) - 1.5ft (0.5m), 11s period with SSW swell.
  • Evening surf: Evening surf (11 Aug, local time) - 4.5ft (1.4m), 6s period with SSW swell.

The current surf forecast for Kugenuma Rivermouth at 2AM is: 0.5m 10s primary swell from a South-southwest direction and 0.2m 11s secondary swell from a East direction (forecast issued at 08:00pm August 10). An open ocean swell of 0.4m 3s is not directed at the surf break. The wind direction is predicted to be offshore.

Time (JST) & DateWave HeightWave Period
Morning (11 Aug)1.5ft (0.5m)10s
Afternoon (11 Aug)1.5ft (0.5m)11s
Evening (11 Aug)4.5ft (1.4m)6s

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


Short Range Forecast

Heavy rain (total 27mm), heaviest during Tue night. Warm (max 28°C on Thu morning, min 22°C on Tue night). Winds decreasing (fresh winds from the SE on Tue night, light winds from the NE by Thu afternoon).

Mon
10
Tuesday
11
Wednesday
12
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
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.5
SSW
11
0.5
SSW
10
0.5
SSW
10
0.5
SSW
10
0.5
SSW
10
0.5
SSW
10
0.5
SSW
11
0.5
SSW
11
1.4
SW
5
1.4
SSW
6
1.4
S
6
1.3
SSE
6
1
S
6
0.5
SSW
10
0.5
SSW
10
0.7
SSE
6
0.4
SSW
10
0.4
SSW
10
Wave Graph
Metric surfscale
Energy kJ
64
59
59
58
58
62
64
64
77
115
141
106
62
58
59
41
41
40
Wind (km/h)
25
NE
20
ENE
15
NE
15
NE
10
NE
10
WNW
25
SW
25
SW
25
SSW
35
S
35
SE
30
SE
15
E
15
NNE
15
N
20
N
15
NNE
15
N
Wind State
cross-off
cross-off
cross-off
off
off
cross
on
cross-on
on
cross-on
cross-on
cross-on
cross-off
off
off
off
off
off
High Tide
5:20PM1.42m
2:44AM1.38m
5:32PM1.44m
3:36AM1.44m
5:45PM1.45m
Low Tide
10:13PM1.12m
10:14AM0.18m
10:39PM1.03m
10:47AM0.17m
part cloud
cloud
part cloud
cloud
cloud
cloud
cloud
cloud
light rain
light rain
light rain
heavy rain
light rain
cloud
light rain
part cloud
part cloud
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
4:56
4:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:37
6:36
6:35
 mm
2
3
4
11
4
1
Temp °C
28
25
24
25
24
25
26
26
25
25
24
22
22
23
23
24
25
25
Feels °C
26
24
24
25
24
25
25
25
25
23
21
20
22
24
23
23
25
25
  • 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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