Kugenuma Rivermouth surfForecast / Kanagawa / Japan

information circle12 Day Weather and Surf, issued 2 pm Wednesday 10 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
18.6° C
(Which is 1.0°C colder than average for this time of year)


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 Friday (Dec 12) at 3AM. The primary swell is predicted to be 1.1m and 7s period with a secondary swell of 0.1m and 11s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Kugenuma Rivermouth in the next 12 days are 1.6m 10s and forecast to arrive on Sunday (Dec 14) at 9PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 3s period and expected on Friday (Dec 12) at 6PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Fri 12th Dec)3.5ft (1.1m) 7s
Best Surf 9PM (Sun 14th Dec)5ft (1.6m) 10s
Most Powerful 9PM (Sun 14th Dec)5ft (1.6m) 10s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Very mild (max 15°C on Thu afternoon, min 4°C on Fri night). Mainly strong winds.

Days 3-6 Weather Summary Moderate rain (total 16mm), heaviest on Sun morning. Very mild (max 11°C on Mon afternoon, min 5°C on Sun morning). Winds decreasing (fresh winds from the N on Sun morning, calm by Mon morning).

Wed
10
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
1
2
1
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.2
ESE
0.2
ESE
0.2
ESE
0.9
SW
1.8
SW
0.4
SW
0.1
E
0.1
E
0.1
E
0.1
E
0.4
SE
0.5
SE
1
SSE
1.3
SSE
0.5
SSE
0.4
SSE
0.4
SE
0.3
SE
0.2
SSE
0.1
SE
0.1
SE
Period(s) (?)11111147811121111779109998888
Wave
Graph
(?)Metric surfscale
Energy kJ (?)11121124289152322112216533548321911622
Wind
(km/h)
10
NE
10
N
0
W
40
SW
45
W
35
NNE
25
NNE
15
NNE
10
NE
10
ENE
25
NNE
20
N
20
N
5
N
10
N
5
ENE
10
N
10
NE
5
ESE
10
N
10
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
offglasscross-
on
cross-
on
offoffoffcross-
off
cross-
off
offoffoffglasscross-
off
glasscross-
off
offcrossoffcross-
off
High Tide
/ height (m)
7:22PM
1.28
9:46AM
1.31
8:32PM
1.15
10:34AM
1.31
10:08PM
1.05
11:23AM
1.30
12:13AM
1.02
12:10PM
1.31
2:15AM
1.08
12:52PM
1.33
3:35AM
1.17
1:31PM
1.36
4:30AM
1.25
Low Tide
/ height (m)
2:30AM
0.33
3:45PM
0.93
3:23AM
0.49
5:20PM
0.82
4:28AM
0.64
6:38PM
0.67
5:45AM
0.78
7:37PM
0.51
7:02AM
0.89
8:25PM
0.36
8:07AM
0.97
9:07PM
0.23
8:59AM
1.03
Wed
10
Thursday
11
Friday
12
Saturday
13
Sunday
14
Monday
15
Tuesday
16
Sunrise--6:39--6:39--6:41--6:41--6:41--6:43--6:43
Sunset4:29--4:29--4:30--4:30--4:30--4:30--4:30--
clear
cloud
cloud
clear
clear
part cloud
part cloud
clear
cloud
light rain
light rain
mod rain
rain showers
rain showers
clear
clear
clear
cloud
part cloud
clear
clear
Rain (mm)
---------111031-------
Temp. °C1312131514996666691010118810109
Feels °C (?)7776301-1221-1687814887
  • 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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