Keta Reef Oshima surfForecast / Izu Islands / Japan

information circle12 Day Weather and Surf, issued 8 am Thursday 18 Dec 2025 JST
Forecast update in hr  min  s Forecast update imminent
Keta Reef Oshima surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Keta Reef Oshima sea temperature is
19.0° C
(Which is slightly cooler than normal)


Best Forecast Surf Conditions for Keta Reef Oshima this week:

The surf forecast for Keta Reef Oshima over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Dec 24) at 9AM. The primary swell is predicted to be 0.8m and 9s period with a secondary swell of 0.6m and 8s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Keta Reef Oshima in the next 12 days are 3.0m 8s and forecast to arrive on Thursday (Dec 25) at 6AM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.9m 6s period and expected on Monday (Dec 22) at 3PM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Wed 24th Dec)2.5ft (0.8m) 9s
Best Surf12PM (Wed 24th Dec)4.5ft (1.4m) 9s
Most Powerful 6AM (Thu 25th Dec)10ft (3.0m) 8s

Table - best surf conditions forecast for Keta Reef Oshima over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 22mm), heaviest during Sat afternoon. Very mild (max 19°C on Sat night, min 11°C on Thu morning). Mainly fresh winds.

Days 3-6 Weather Summary Heavy rain (total 35mm), heaviest during Sun morning. Very mild (max 18°C on Sun afternoon, min 10°C on Mon morning). Winds decreasing (strong winds from the NE on Sun night, light winds from the NNE by Tue night).

Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.5
SW
0.4
SW
0.2
E
0.2
ESE
0.2
E
0.2
E
0.2
E
0.1
E
1.7
SSE
1.6
SSW
1.7
SSW
1.3
SE
1
SE
1
SE
0.9
SE
0.9
SE
0.8
SE
0.6
SE
0.8
E
0.9
SE
0.4
ENE
Period(s) (?)6611111313121266788999999812
Wave
Graph
(?)Metric surfscale
Energy kJ (?)19109111413114237190261191120152120120996210111246
Wind
(km/h)
30
NE
25
NE
15
NE
20
NNE
10
NE
20
S
35
S
25
SW
35
SSW
40
SSW
30
SW
20
WSW
45
NE
35
NE
35
NE
35
NNE
25
NNE
20
NNE
10
NNE
15
S
35
SSW
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
crosscross-
on
cross-
on
crosscross-
on
oncross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
cross-
off
crosscross-
on
High Tide
/ height (m)
2:43PM
1.37
5:20AM
1.33
3:19PM
1.40
5:54AM
1.36
3:54PM
1.41
6:28AM
1.37
4:28PM
1.42
7:02AM
1.37
5:02PM
1.42
7:35AM
1.35
5:38PM
1.41
8:08AM
1.32
6:17PM
1.36
Low Tide
/ height (m)
9:32AM
0.96
10:04PM
0.08
10:13AM
0.95
10:38PM
0.03
10:50AM
0.95
11:12PM
-0.00
11:25AM
0.94
11:46PM
-0.01
11:59AM
0.94
12:21AM
-0.00
12:33PM
0.93
12:56AM
0.03
1:11PM
0.91
1:32AM
0.11
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Sunrise6:43--6:43--6:43--6:45--6:45--6:46--6:46--
Sunset-4:32--4:34--4:34--4:34--4:35--4:35--4:36-
clear
cloud
part cloud
part cloud
cloud
light rain
light rain
mod rain
rain showers
heavy rain
heavy rain
part cloud
light rain
cloud
part cloud
part cloud
cloud
part cloud
rain showers
light rain
heavy rain
Rain (mm)
-----217122311-1-----1117
Temp. °C111212121418181819171818111111101212131818
Feels °C (?)37771311111414111313233276121212
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

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Information about the Keta Reef Oshima Surf forecast

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

Keta Reef Oshima is 1 km (1 miles) from the city of Oshima. If you plan a holiday in Izu Islands, look for hotels and other accommodation in Oshima. Oshima has rooms for a wide range of budgets as well as car hire and transport links.

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