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Surf Forecasts:

Kugenuma Rivermouth surfForecast / Kanagawa / Japan

information circle12 Day Weather and Surf, issued 2 pm Wednesday 11 Mar 2026 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
15.1° C
 (Which is 1.6°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 Sunday (Mar 15) at 3AM. The primary swell is predicted to be 0.7m and 9s period with a secondary swell of 0.1m and 19s. 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 0.7m 10s and forecast to arrive on Saturday (Mar 14) at 9PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 3s period and expected on Saturday (Mar 14) at 12AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Sun 15th Mar)2.5ft (0.7m) 9s
Best Surf 3AM (Sun 15th Mar)2.5ft (0.7m) 9s
Most Powerful 9PM (Sat 14th Mar)2.5ft (0.7m) 10s

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

Updates in  hr  min  s Forecast update imminent 
16 DaysHourly
Print Table

Short Range Forecast Mostly dry. Very mild (max 11°C on Thu afternoon, min 5°C on Wed night). Winds increasing (light winds from the SE on Wed afternoon, fresh winds from the NNE by Fri night).

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Mon night. Very mild (max 13°C on Tue morning, min 9°C on Sun night). Wind will be generally light.

Wed
11
Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.1
S
0.1
S
0.1
E
0.1
S
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.1
E
0.7
SE
0.6
SE
0.5
SE
0.4
SE
0.3
SE
0.3
SE
0.2
ESE
0.2
ESE
0.2
ESE
0.2
ESE
0.2
SSE
Period(s) (?)9916161618181818181099999131112116
Wave
Graph
(?)Metric surfscale
Energy kJ (?)2255597666946840261212161314123
Wind
(km/h)
5
SE
5
NE
15
NNE
15
NE
25
NE
30
NNE
25
NE
30
NNE
30
NNE
15
ENE
5
SE
5
NNE
10
ESE
5
ENE
15
NNE
15
E
10
NNE
15
NE
10
SSE
10
W
5
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
off		offcross-
off		offoffoffoffoffcross-
off		cross-
on		offcrosscross-
off		offcross-
off		offoffcross-
on		cross-
on		glass
High Tide
/ height (m)
8:41AM
1.16
4:20AM 10:55AM
1.15 1.05
4:12AM
1.21
1:32PM
1.07
4:21AM
1.24
2:48PM
1.16
4:32AM
1.27
3:37PM
1.24
4:45AM
1.28
4:18PM
1.31
4:57AM
1.31
Low Tide
/ height (m)
4:49PM
0.33
6:47PM
0.32
8:56AM
1.04
8:08PM
0.26
9:25AM
0.92
9:02PM
0.21
9:49AM
0.80
9:42PM
0.19
10:11AM
0.67
10:15PM
0.20
10:32AM
0.53
10:43PM
0.24
10:55AM
0.40
Wed
11
Thursday
12
Friday
13
Saturday
14
Sunday
15
Monday
16
Tuesday
17
Sunrise--5:58--5:56--5:54--5:54--5:52--5:50--5:50
Sunset5:45--5:45--5:46--5:47--5:47--5:49--5:50--
part cloud
cloud
clear
part cloud
part cloud
cloud
cloud
cloud
clear
clear
part cloud
clear
part cloud
cloud
part cloud
part cloud
rain showers
clear
clear
part cloud
part cloud
Rain (mm)
----------------2----
Temp. °C8781110710910121111121111121113131314
Feels °C (?)44254-13137788878711101012
  • 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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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Kugenuma Rivermouth surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Kugenuma Rivermouth at:
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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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