Kugenuma Rivermouth surfForecast / Kanagawa / Japan

information circle12 Day Weather and Surf, issued 2 am Wednesday 31 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
17.3° 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 (Jan 05) at 3AM. The primary swell is predicted to be 1.7m and 8s period. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Kugenuma Rivermouth in the next 12 days are 2.2m 7s and forecast to arrive on Monday (Jan 05) at 12AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.5m 7s period and expected on Monday (Jan 05) at 3AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Mon 5th Jan)5.5ft (1.7m) 8s
Best Surf 3AM (Mon 5th Jan)5.5ft (1.7m) 8s
Most Powerful12AM (Mon 5th Jan)7ft (2.2m) 7s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Light rain (total 4mm), mostly falling on Fri night. Very mild (max 11°C on Wed afternoon, min 2°C on Fri night). Winds increasing (calm on Thu afternoon, fresh winds from the NNE by Fri night).

Days 3-6 Weather Summary Mostly dry. Very mild (max 11°C on Sun afternoon, min 6°C on Sat morning). Mainly near gales.

Wednesday
31
Thursday
01
Friday
02
Saturday
03
Sunday
04
Monday
05
Tuesday
06
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.2
SSW
0.2
SSW
0.4
SW
0.1
E
0.2
SSW
0.1
SW
0.2
SSW
0.2
SSW
0.4
SW
0.1
SE
0.1
SW
0.1
SW
0.5
SW
1.8
SW
2.2
SW
0.7
SW
0.3
SW
0.3
SW
0.2
SSW
0.3
SSW
0.8
SW
Period(s) (?)5551548449998567999425
Wave
Graph
(?)Metric surfscale
Energy kJ (?)2274222220333122444629013123129
Wind
(km/h)
15
NNE
10
NE
20
NNE
20
NNE
5
ENE
20
NNE
10
NNE
20
SW
15
N
10
W
10
S
5
W
15
WSW
50
WSW
45
WSW
15
NNW
35
NNW
5
SSE
15
NNE
10
S
25
N
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
offcross-
off
offoffcross-
off
offoffoncross-
off
crossoncross-
on
cross-
on
cross-
on
cross-
on
cross-
off
cross-
off
cross-
on
offcross-
on
off
High Tide
/ height (m)
1:22PM
1.33
5:08AM
1.26
2:06PM
1.35
5:41AM
1.31
2:51PM
1.39
6:06AM
1.34
3:35PM
1.42
6:28AM
1.35
4:19PM
1.44
6:50AM
1.36
5:03PM
1.44
7:14AM
1.36
5:49PM
1.41
Low Tide
/ height (m)
9:19PM
0.14
9:14AM
1.10
9:59PM
0.05
10:05AM
1.10
10:35PM
-0.00
10:40AM
1.07
11:08PM
-0.03
11:13AM
1.02
11:41PM
-0.02
11:47AM
0.95
12:13AM
0.02
12:24PM
0.87
12:46AM
0.09
Wednesday
31
Thursday
01
Friday
02
Saturday
03
Sunday
04
Monday
05
Tuesday
06
Sunrise6:50--6:50--6:50--6:50--6:50--6:50--6:50--
Sunset-4:38--4:38--4:39--4:40--4:42--4:43--4:43-
part cloud
cloud
part cloud
part cloud
part cloud
part cloud
rain showers
part cloud
rain showers
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
rain showers
Rain (mm)
------2-2-----------16
Temp. °C101111799584788911107976109
Feels °C (?)7771551203342-1-2-143264
  • Map Icons:
  • Break
  • 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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