Surf Forecasts:
Udo Shrine surf forecast from 17 Aug 2026:
- Best quality surf: Friday 21 Aug, 12PM (local time) - 5ft (1.5m), 10s period, S swell with cross-offshore winds.
- Most powerful swell: Friday 21 Aug, 12AM (local time) - 6ft (1.8m), 11s period, S swell with 736 kJ wave energy.
- Next surfable swell (1★+): Friday 21 Aug, 12PM (local time) - 5ft (1.5m), 10s period with S swell.
Best Forecast Surf Conditions for Udo Shrine this week:
The surf forecast for Udo Shrine over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Aug 21) at 12PM. The primary swell is predicted to be 1.5m and 10s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Udo Shrine in the next 16 days are 1.8m 11s and forecast to arrive on Friday (Aug 21) at 12AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 6s period and expected on Sunday (Aug 23) at 3PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 12PM (Fri 21st Aug) | 5ft (1.5m) 10s |
| Best Surf | 12PM (Fri 21st Aug) | 5ft (1.5m) 10s |
| Most Powerful | 12AM (Fri 21st Aug) | 6ft (1.8m) 11s |
Table - best surf conditions forecast for Udo Shrine over the next 16 days.
The Lowdown
Alright, Rusty here again, giving you the same rundown but in feet and miles per hour.
For Udo Shrine, the first week is a write-off. From now through Sunday, August 23rd, we’ve got poor to marginal surf. The waves are tiny, mostly 3 to 4 feet, and the wind is cross or cross-onshore. There’s rain and thunderstorms in the mix. Not worth getting the wetsuit wet.
The water temp is 83°F, which is normal for this time of year.
The one real bright spot comes on Monday, August 24th, early. The swell drops to just 2 feet from the east, but the wind goes glassy – dead calm. That’s a rare treat. The combined energy is weak (246), but with no wind, those little waves will be smooth and clean. Udo Shrine is a reef, so even small glassy sets can be fun. Crowds are often there, so don’t expect solitude, but a Monday morning might thin them out.
After that, things get more interesting but messier. On Tuesday, August 25th, a long-period groundswell shows up – 4 feet from the ESE with a 15-second period. The combined energy hits 874 (moderate). Wind is light cross-onshore in the morning, but by afternoon, the swell builds to 6 feet from the SE with a 16-second period and combined energy of 1698 (strong). That’s a very long period, so the waves will have shape and punch, but at a reef, long-period swells can straighten out. Sets will be far apart, making paddling easier.
Wednesday the 26th: morning waves at 8 feet, afternoon at 10 feet from the SE. Combined energy over 3600 (very strong). Wind is onshore from the NE, so the face will be choppy. This is big and only for experts.
From Thursday the 27th onward, it gets wild. Waves hit 8 feet, then 10 feet, and by Sunday the 30th, we’re looking at 16 to 18 feet from the ESE. The wind is gale-force, and combined energy screams up to 29,312 (very strong). The guidance says wind and tide are fine, but the swell is way too big for this break. This is kite-surfing territory, not paddle surfing. Monday, August 31st, we’re talking 20 to 21 feet, and by September 1st, it’s 26 feet with energy over 37,000. Absolutely unsurfable here.
Bottom line: Monday morning, August 24th is the gem – glassy and clean but small. Tuesday, August 25th offers a powerful groundswell if you can handle the wind. Everything else is blown out or too big.
Keep your eyes on that Monday glass-off.
Rusty.
Short Range ForecastHeavy rain (total 24mm), heaviest during Wed night. Warm (max 29°C on Mon afternoon, min 27°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 101mm), heaviest during Fri night. Warm (max 29°C on Sun morning, min 25°C on Fri afternoon). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | |||||||||||||
Wave Height (m) Direction Period (s) | E 10 | E 9 | E 9 | E 9 | E 8 | E 8 | E 8 | E 8 | SSE 10 | SSE 10 | S 11 | S 10 | S 10 | S 9 | S 9 | SSW 9 | S 9 | E 10 | E 13 | SSW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 220 | 133 | 130 | 101 | 92 | 138 | 163 | 104 | 348 | 383 | 736 | 514 | 371 | 293 | 235 | 135 | 225 | 47 | 31 | 185 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | on | on | cross-on | on | cross-on | cross-on | on | cross-on | cross | cross-on | cross-off | cross | cross-off | cross-off | cross-off | off | cross-off | off |
High Tide | 9:02PM1.99m | 9:38AM1.76m | 9:28PM1.93m | 10:30AM1.62m | 9:55PM1.86m | 11:45AM1.51m | 10:29PM1.78m | 2:13PM1.49m | 11:25PM1.69m | 4:05PM1.59m | 1:09AM1.65m | 4:44PM1.70m | 2:48AM1.69m | |||||||
Low Tide | 3:25AM0.68m | 3:21PM0.94m | 4:07AM0.74m | 3:49PM1.13m | 4:58AM0.81m | 4:22PM1.30m | 6:09AM0.87m | 5:30PM1.44m | 7:47AM0.86m | 8:18PM1.48m | 9:11AM0.77m | 9:49PM1.39m | ||||||||
 |  |  | | |  | |  | | | |  | | | | | | | | | |
 | — | — | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — |
 | 6:55 | — | — | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — |
mm | — | 1 | — | — | 3 | 3 | 2 | 10 | 5 | 6 | 13 | 6 | 6 | 45 | 15 | 4 | 5 | 1 | 1 | 4 |
Temp °C | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 28 | 29 | 28 | 27 | 27 | 26 | 26 | 27 | 27 | 27 | 29 | 28 | 27 |
Feels °C | 31 | 30 | 30 | 31 | 30 | 31 | 31 | 32 | 32 | 31 | 31 | 30 | 30 | 29 | 29 | 29 | 30 | 31 | 30 | 31 |
Swell 1 Height (m) Direction Period (s) | E 10 | E 9 | E 9 | E 9 | E 8 | SSE 5 | SSE 5 | E 8 | SSE 10 | SSE 10 | S 11 | S 10 | S 10 | S 9 | S 9 | SSW 9 | E 9 | E 10 | E 10 | S 6 |
| kJ | 220 | 133 | 130 | 101 | 92 | 15 | 17 | 104 | 348 | 383 | 736 | 514 | 371 | 293 | 235 | 135 | 41 | 47 | 47 | 47 |
Swell 2 Height (m) Direction Period (s) | S 8 | SSE 5 | S 7 | S 7 | SE 10 | SE 10 | SE 10 | SSE 6 | E 8 | E 8 | E 8 | E 9 | E 9 | ENE 9 | E 9 | E 9 | ESE 10 | S 9 | E 13 | E 10 |
| kJ | 18 | 8 | 26 | 15 | 27 | 27 | 26 | 24 | 60 | 58 | 49 | 39 | 39 | 26 | 24 | 38 | 21 | 39 | 31 | 100 |
Swell 3 Height (m) Direction Period (s) | SE 11 | S 8 | SE 11 | SE 10 | SW 9 | S 7 | S 7 | SE 10 | ESE 10 | SE 10 | SE 10 | ESE 11 | SE 11 | ESE 11 | ESE 11 | ESE 11 | E 14 | E 14 | ESE 11 | SSW 8 |
| kJ | 30 | 10 | 18 | 17 | 3 | 4 | 4 | 25 | 20 | 26 | 27 | 22 | 30 | 23 | 24 | 23 | 35 | 32 | 22 | 22 |
Wind waves Height (m) Direction Period (s) | S 4 | S 5 | — | — | SE 8 | E 8 | E 8 | — | — | — | — | — | — | — | — | S 5 | S 9 | S 6 | S 6 | SSW 8 |
| kJ | 10 | 13 | — | — | 45 | 138 | 163 | — | — | — | — | — | — | — | — | 47 | 225 | 80 | 99 | 185 |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 692 | 19 | 33 | 33 | 33 | 297 | 342 | 19 | 33 | 342 | 33 | 297 | 0 | 58 | 310 | 21 | 13 | 0 | 338 | 0 |
Best forecast wave conditions in Kyu Shu | ||||||||||||||||||||
Best forecast wave conditions in Japan | ||||||||||||||||||||
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Information about the Udo Shrine Surf forecast
The above surf forecast table for Udo Shrine provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Udo Shrine can be found by selecting the local surf guide option on the grey menu. Our Udo Shrine 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 (Udo Shrine) 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 Udo Shrine 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.
Udo Shrine is 10 km (6 miles) from Nichinan. If you plan a holiday in Kyu Shu, look for hotels and other accommodation in Nichinan. Nichinan has rooms for a wide range of budgets as well as car hire and transport links.
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