Surf Forecasts:
Udo Shrine surf forecast from 18 Aug 2026:
- Best quality surf: Friday 21 Aug, 3AM (local time) - 4.5ft (1.3m), 10s period, S swell with glassy winds.
- Most powerful swell: Tuesday 25 Aug, 3PM (local time) - 10ft (3.0m), 16s period, SE swell with 3,990 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 6AM (local time) - 2.5ft (0.8m), 8s period with E 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 Thursday (Aug 20) at 6AM. The primary swell is predicted to be 0.8m and 8s period with a secondary swell of 0.7m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Udo Shrine in the next 16 days are 3.0m 16s and forecast to arrive on Tuesday (Aug 25) at 3PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 7s period and expected on Thursday (Aug 20) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Thu 20th Aug) | 2.5ft (0.8m) 8s |
| Best Surf | 3AM (Fri 21st Aug) | 4.5ft (1.3m) 10s |
| Most Powerful | 3PM (Tue 25th Aug) | 10ft (3.0m) 16s |
Table - best surf conditions forecast for Udo Shrine over the next 16 days.
The Lowdown
Alright, let’s get into it.
The next couple of weeks are a bit of a mixed bag for Udo Shrine. There is some swell early on, but it’s small and lumpy. The real meat of this forecast is the solid groundswell that shows up in the second week, and it looks like Thursday the 27th is the standout day.
First up, the early part of the week is pretty flat and uninviting. Tuesday the 18th through Sunday the 23rd is a write-off, honestly. We’ve got small, weak swell in the 2ft to 4ft range, with mostly onshore or cross-onshore winds messing things up. The water temp is sitting at 83°, which is bang normal for this time of year, but you aren’t going to be comfortable. It’s going to be a frustrating stretch, and you might be better off doing something else for a few days. The energy is weak, with combined swell energy values of 160 and below for a lot of that time.
We start to see a shift on Monday the 24th. The swell starts to fill in from the ESE, and the period jumps to 14-16 seconds. The energy numbers start climbing, hitting 492 in the morning and nearly double that, to 993, by the afternoon. This is the groundswell arriving. Still not clean, but you can feel the ocean waking up. The surf is getting bigger, up to 4ft by Monday afternoon.
Then Tuesday the 25th brings a big jump in size, but also a lot of wind. We’re looking at 8ft to 10ft of ESE/SE groundswell, but with a moderate onshore/cross-onshore breeze making it choppy. The energy is strong, hitting 4227 by the afternoon. This is a lot of water moving, but it’s going to be a mess. This is more of a kite-surfing day than a clean surf day.
Wednesday the 26th is still big, up to 13ft, and the energy is up to 8172. But the wind is still on it, so the quality isn't there. This is where the patience pays off.
Thursday, August 27th is the one. The morning is an absolute gem. The wind drops right out, goes glassy, and we’ve got a clean 15ft of SE groundswell with a 16-second period. The combined energy is at a hefty 10349, which is strong to very strong. This is a serious, powerful groundswell. The direction is from the SE, and Udo Shrine’s optimum is from the S, so it’s a little angled, but the period is so long and the conditions are so clean, it’s going to be a proper session for experts only. This size is well beyond a beginner's comfort zone. The afternoon eases a touch to 15ft, with a slight cross-onshore coming up, knocking the score down a notch, but it's still going to be good. This is the highlight of the whole run.
Friday the 28th holds solid, with 13ft of SE/ESE swell, but the wind goes offshore and it’s glassy again. The period drops a bit to 14 seconds, but it’s still a proper groundswell. Energy is still very strong at 6756 in the morning. This is a great back-up day.
The weekend after that, the 29th and 30th, the swell comes down a bit, but it's still fun. Saturday the 29th has 8ft of SE swell and clean morning conditions with light winds. It will be good, but not as big as the days before. Sunday the 30th sees a pulse of energy returning, with 11ft to 13ft on the cards, but the winds turn onshore and it gets messy again.
Looking further out to the first days of September, the surf stays solid in the 8ft to 10ft range, but the wind is mostly cross-onshore again. It’s going to be a bit of a grind.
So, the long and short of it is: it gets real on Thursday, August 27th. That Thursday morning is the best combination of size, period, and wind we get in this whole window. If you’re an expert, that’s your window. The Friday is also excellent. Everything else is either small and weak, or big and blown out.
Rusty.
Short Range ForecastModerate rain (total 18mm), heaviest on Wed night. Warm (max 28°C on Tue morning, min 27°C on Tue morning). Wind will be generally light. | Days 4-6 Weather SummaryLight rain (total 2mm), mostly falling on Sun night. Warm (max 29°C on Fri afternoon, min 26°C on Sat night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | |||||||||||||||
AM | 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 9 | E 9 | E 9 | E 8 | E 8 | E 8 | SSE 8 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 8 | S 8 | S 8 | E 10 | E 10 | ESE 14 | ESE 16 | ESE 16 |
Wave Graph | |||||||||||||||||||||
130 | 101 | 94 | 112 | 173 | 104 | 112 | 203 | 275 | 246 | 234 | 188 | 123 | 89 | 84 | 64 | 73 | 125 | 323 | 886 | 1832 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | on | on | on | cross-on | on | cross-on | cross-on | cross-on | cross-on | cross-on | on | cross-on | glassy | on | cross-on | cross | cross-on | on | on |
High Tide | 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 | 5:13PM1.80m | ||||||||
Low Tide | 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 | 10:07AM0.64m | 10:34PM1.27m | ||||||||
5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — | |
— | 6:54 | — | — | 6:53 | — | — | 6:52 | — | — | 6:52 | — | — | 6:51 | — | — | 6:49 | — | — | 6:47 | — | |
mm | — | — | 1 | 3 | 1 | 8 | 2 | — | 3 | — | — | — | — | — | — | — | — | 2 | — | — | — |
Temp °C | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 28 | 28 | 27 |
Feels °C | 31 | 31 | 31 | 31 | 31 | 31 | 33 | 31 | 32 | 33 | 33 | 31 | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | E 9 | E 9 | E 9 | SSE 5 | E 8 | E 8 | SSE 8 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 8 | S 8 | S 8 | S 8 | E 10 | ESE 14 | ESE 16 | ESE 16 |
130 | 101 | 94 | 15 | 173 | 104 | 112 | 203 | 275 | 246 | 234 | 188 | 123 | 89 | 84 | 64 | 63 | 125 | 323 | 886 | 1832 | |
Swell 2 Height (m) Direction Period (s) | S 5 | S 6 | SE 10 | SE 10 | SE 10 | S 6 | E 8 | E 8 | E 7 | E 8 | E 9 | E 9 | E 9 | E 9 | E 9 | E 10 | E 10 | S 8 | E 10 | E 10 | E 9 |
12 | 17 | 27 | 27 | 26 | 16 | 78 | 58 | 26 | 37 | 40 | 39 | 26 | 39 | 41 | 47 | 73 | 58 | 125 | 64 | 80 | |
Swell 3 Height (m) Direction Period (s) | SE 11 | SE 10 | SW 9 | S 7 | S 7 | SE 10 | SE 10 | SE 10 | SE 10 | SE 11 | SE 11 | SE 11 | SE 11 | ESE 11 | E 14 | ESE 13 | E 13 | SE 15 | S 8 | S 8 | E 12 |
18 | 17 | 3 | 4 | 4 | 25 | 25 | 25 | 25 | 29 | 30 | 30 | 31 | 40 | 34 | 34 | 31 | 106 | 44 | 43 | 69 | |
Wind waves Height (m) Direction Period (s) | — | — | SSE 7 | E 8 | E 8 | — | — | — | — | — | — | — | ENE 6 | — | — | ESE 4 | — | — | — | — | ESE 9 |
— | — | 37 | 112 | 138 | — | — | — | — | — | — | — | 7 | — | — | 3 | — | — | — | — | 139 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 33 | 33 | 28 | 33 | 342 | 28 | 33 | 33 | 19 | 33 | 33 | 28 | 33 | 324 | 0 | 33 | 33 | 15 | 33 | 342 | 33 |
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.











