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Surf Forecasts:

Keta Reef Oshima surfForecast / Izu Islands / Japan

information circle12 Day Weather and Surf, issued 8 pm Sunday 01 Feb 2026 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
16.6° 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 Saturday (Feb 07) at 12AM. The primary swell is predicted to be 1.0m and 7s period with a secondary swell of 0.2m and 9s. 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 2.0m 9s and forecast to arrive on Sunday (Feb 08) at 12PM. Winds are predicted to be 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 Saturday (Feb 07) at 12AM.

Wave TypeTime (JST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Sat 7th Feb)3.5ft (1.0m) 7s
Best Surf12AM (Mon 9th Feb)6ft (1.8m) 8s
Most Powerful12PM (Sun 8th Feb)6.5ft (2.0m) 9s

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

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

Short Range Forecast Mostly dry. Very mild (max 10°C on Wed afternoon, min 7°C on Sun night). Winds decreasing (near gales from the WSW on Mon afternoon, light winds from the SSW by Tue afternoon).

Days 3-6 Weather Summary Light rain (total 2mm), mostly falling on Sat morning. Very mild (max 13°C on Thu afternoon, min 5°C on Sat morning). Mainly gales.

Monday
02
Tuesday
03
Wednesday
04
Thursday
05
Friday
06
Saturday
07
Sun
08
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.6
SW
0.8
WSW
1.3
WSW
1.6
W
0.3
SW
0.4
SW
0.3
E
0.9
WSW
1.2
SW
0.8
SW
0.7
WSW
0.6
SW
1.6
WSW
1.9
WSW
2.2
WSW
1
WSW
0.8
SW
2
WSW
1.9
WSW
2
WSW
0.9
WSW
Period(s) (?)777667645544566777669
Wave
Graph
(?)Metric surfscale
Energy kJ (?)43621381815177316635191014025538611465400214243129
Wind
(km/h)
20
WNW
20
W
45
WSW
30
W
45
NNE
10
NE
20
SSW
35
WSW
45
SW
20
W
25
WSW
40
SW
50
WSW
55
WSW
65
WSW
10
NNE
25
NE
15
WSW
65
WSW
55
W
55
W
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
ononononcross-
off		cross-
off		cross-
on		oncross-
on		ononcross-
on		onononcross-
off		cross-
off		cross-
on		ononon
High Tide
/ height (m)
5:57AM
1.39
4:33PM
1.47
6:21AM
1.39
5:17PM
1.47
6:43AM
1.38
5:59PM
1.43
7:03AM
1.37
6:41PM
1.35
7:22AM
1.36
7:23PM
1.24
7:41AM
1.35
8:08PM
1.12
7:59AM
1.33
Low Tide
/ height (m)
10:53PM
-0.14
11:09AM
0.78
11:31PM
-0.11
11:43AM
0.68
12:05AM
-0.03
12:17PM
0.58
12:36AM
0.09
12:52PM
0.50
1:03AM
0.24
1:28PM
0.45
1:28AM
0.40
2:05PM
0.42
1:50AM
0.55
2:47PM
0.41
Monday
02
Tuesday
03
Wednesday
04
Thursday
05
Friday
06
Saturday
07
Sun
08
Sunrise-6:39--6:39--6:39--6:37--6:37--6:35--6:35-
Sunset--5:10--5:12--5:13--5:14--5:15--5:15--5:16
part cloud
clear
clear
part cloud
clear
clear
clear
part cloud
cloud
part cloud
part cloud
cloud
clear
clear
part cloud
cloud
rain showers
part cloud
clear
clear
part cloud
Rain (mm)
----------------2----
Temp. °C98997999101112131313131268645
Feels °C (?)20-3-2-454-1023420-1702-10-9-8
  • 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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View detailed surf forecast for Keta Reef Oshima at:
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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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