Nagahama surfForecast / Kanagawa / Japan

information circle12 Day Weather and Surf, issued 2 pm Sunday 14 Dec 2025 JST
Forecast update in hr  min  s Forecast update imminent
Nagahama surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Nagahama sea temperature is
18.4° C
(Which is 1.0°C colder than average for this time of year)


Best Forecast Surf Conditions for Nagahama this week:

The surf forecast for Nagahama 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 Nagahama in the next 12 days are 3.0m 9s and forecast to arrive on Sunday (Dec 14) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 2s period and expected on Tuesday (Dec 16) at 12AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Mon 15th Dec)2ft (0.6m) 10s
Best Surf 9AM (Sun 21st Dec)5.5ft (1.7m) 7s
Most Powerful 9PM (Sun 14th Dec)10ft (3.0m) 9s

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

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Mostly dry. Very mild (max 13°C on Sun afternoon, min 8°C on Mon night). Mainly fresh winds.

Days 3-6 Weather Summary Light rain (total 6mm), mostly falling on Fri night. Very mild (max 15°C on Sat morning, min 8°C on Wed night). Winds decreasing (fresh winds from the NNE on Thu morning, calm by Fri night).

Sun
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
2
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2
Swell
Height Map
Wave Height (m) & direction (?)
1.5
SSE
1.5
SW
0.6
SSW
0.4
SE
0.3
SE
0.2
SSE
0.2
SSE
0.2
SSW
0.2
SSW
0.2
SSW
0.1
SE
0.1
S
0.1
S
0.1
SE
0.1
SE
0.3
SE
0.4
SE
0.7
SE
0.7
SE
0.7
SSE
1.7
SSE
Period(s) (?)1099988875410661211567777
Wave
Graph
(?)Metric surfscale
Energy kJ (?)4023425821117652241164414515043293
Wind
(km/h)
0
ENE
30
W
15
NNE
10
ENE
20
NE
20
N
5
SSE
10
NNW
15
NNE
5
NE
30
N
30
NNE
15
NE
10
NNE
20
NNE
15
NE
0
NNE
10
ENE
15
SSW
15
N
0
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glasscross-
on
cross-
off
offoffcross-
off
cross-
on
cross-
off
offoffcross-
off
cross-
off
offoffoffoffglasscross-
off
cross-
on
cross-
off
glass
High Tide
/ height (m)
1:08AM
1.09
12:45PM
1.30
2:31AM
1.17
1:26PM
1.34
3:33AM
1.26
2:06PM
1.38
4:23AM
1.33
2:44PM
1.42
5:07AM
1.38
3:22PM
1.46
5:48AM
1.41
4:00PM
1.49
6:26AM
1.42
Low Tide
/ height (m)
6:52PM
0.61
6:31AM
0.77
7:48PM
0.45
7:38AM
0.84
8:35PM
0.30
8:35AM
0.89
9:18PM
0.16
9:24AM
0.92
9:58PM
0.05
10:07AM
0.94
10:37PM
-0.02
10:46AM
0.95
11:16PM
-0.06
11:24AM
0.94
Sun
14
Monday
15
Tuesday
16
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunrise--6:41--6:41--6:43--6:43--6:43--6:45--6:45
Sunset4:30--4:30--4:30--4:30--4:30--4:30--4:31--
part cloud
clear
clear
clear
part cloud
clear
clear
clear
clear
clear
part cloud
clear
part cloud
cloud
cloud
cloud
light rain
rain showers
rain showers
rain showers
heavy rain
Rain (mm)
----------------3321218
Temp. °C131212121091111101212911119111315171616
Feels °C (?)76984589597267491312161614
  • 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 Nagahama Surf forecast

The above surf forecast table for Nagahama provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Nagahama can be found by selecting the local surf guide option on the grey menu. Our Nagahama 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 (Nagahama) 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 Nagahama 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.

Nagahama is 6 km (4 miles) from Miura. If you plan a holiday in Kanagawa, look for hotels and other accommodation in Miura. Miura has rooms for a wide range of budgets as well as car hire and transport links.

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