Kugenuma Rivermouth surfForecast / Kanagawa / Japan

information circle12 Day Weather and Surf, issued 8 am Sunday 14 Dec 2025 JST
Forecast update in hr  min  s Forecast update imminent
Kugenuma Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Kugenuma Rivermouth sea temperature is
18.5° C
(Which is slightly cooler than normal)


Best Forecast Surf Conditions for Kugenuma Rivermouth this week:

The surf forecast for Kugenuma Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Dec 15) at 6AM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.6m and 6s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Kugenuma Rivermouth in the next 12 days are 3.0m 8s and forecast to arrive on Sunday (Dec 14) at 6PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.0m 9s period and expected on Monday (Dec 15) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Mon 15th Dec)2ft (0.6m) 10s
Best Surf 3PM (Sun 21st Dec)6ft (1.9m) 7s
Most Powerful 6PM (Sun 14th Dec)10ft (3.0m) 8s

Table - best surf conditions forecast for Kugenuma Rivermouth over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 34mm), heaviest during Sun morning. Very mild (max 13°C on Mon afternoon, min 6°C on Sun morning). Winds decreasing (fresh winds from the N on Sun morning, calm by Mon morning).

Days 3-6 Weather Summary Mostly dry. Very mild (max 14°C on Fri night, min 7°C on Wed night). Winds decreasing (fresh winds from the NNE on Thu morning, calm by Fri afternoon).

Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
1
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.6
SSE
1.7
SSE
1
SSE
0.5
SSE
0.4
SE
0.4
SE
0.2
SSE
0.2
SSE
0.4
SW
0.3
SSW
0.2
SSW
0.2
SSW
0.1
E
0.1
E
0.1
SE
0.1
SE
0.1
SE
0.1
SE
0.1
E
0.1
E
0.4
SE
Period(s) (?)71010109888755510121010111111116
Wave
Graph
(?)Metric surfscale
Energy kJ (?)3156319452211876145242344553310
Wind
(km/h)
35
N
15
S
25
W
10
NNE
10
E
15
NE
15
N
10
SSE
10
NW
10
NNE
5
E
25
N
30
NNE
15
NE
5
N
15
NNE
5
SSE
10
WSW
5
N
10
SSE
10
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
on
crossoffcross-
off
offoffcross-
on
cross-
off
offcross-
off
offoffoffoffoffglasscross-
on
cross-
off
cross-
on
off
High Tide
/ height (m)
12:10PM
1.31
2:15AM
1.08
12:52PM
1.33
3:35AM
1.17
1:31PM
1.36
4:30AM
1.25
2:07PM
1.39
5:12AM
1.31
2:42PM
1.42
5:48AM
1.34
3:17PM
1.46
6:19AM
1.35
3:55PM
1.48
Low Tide
/ height (m)
7:37PM
0.51
7:02AM
0.89
8:25PM
0.36
8:07AM
0.97
9:07PM
0.23
8:59AM
1.03
9:44PM
0.12
9:40AM
1.07
10:19PM
0.04
10:15AM
1.09
10:53PM
-0.01
10:48AM
1.08
11:27PM
-0.03
Sunday
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunrise6:41--6:41--6:43--6:43--6:43--6:45--6:45--
Sunset-4:30--4:30--4:30--4:30--4:30--4:31--4:31-
rain showers
clear
clear
clear
clear
part cloud
clear
clear
clear
clear
part cloud
cloud
part cloud
part cloud
part cloud
clear
clear
part cloud
clear
clear
heavy rain
Rain (mm)
34-------------------15
Temp. °C812121213109111010111191110101214141817
Feels °C (?)37699469878626671012121616
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Kugenuma Rivermouth Surf forecast

The above surf forecast table for Kugenuma Rivermouth provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Kugenuma Rivermouth can be found by selecting the local surf guide option on the grey menu. Our Kugenuma Rivermouth surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Kugenuma Rivermouth) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Kugenuma Rivermouth may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

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