Surf Forecasts:
Uchiumi surf forecast from 27 Aug 2026:
- Best quality surf: Thursday 3 Sep, 3AM (local time) - 11ft (3.5m), 10s period, SE swell with cross-offshore winds.
- Most powerful swell: Wednesday 2 Sep, 3PM (local time) - 11ft (3.5m), 10s period, SE swell with 2,053 kJ wave energy.
- Next surfable swell (1★+): Thursday 27 Aug, 9PM (local time) - 5ft (1.5m), 8s period with SSE swell.
Best Forecast Surf Conditions for Uchiumi this week:
The surf forecast for Uchiumi over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 27) at 9PM. The primary swell is predicted to be 1.5m and 8s period with a secondary swell of 0.5m and 12s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Uchiumi in the next 16 days are 3.5m 10s and forecast to arrive on Wednesday (Sep 02) at 3PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Sunday (Aug 30) at 12AM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Thu 27th Aug) | 5ft (1.5m) 8s |
| Best Surf | 3AM (Thu 3rd Sep) | 11ft (3.5m) 10s |
| Most Powerful | 3PM (Wed 2nd Sep) | 11ft (3.5m) 10s |
Table - best surf conditions forecast for Uchiumi over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's break down the coming surf at Uchiumi. We've got a mixed bag of a forecast ahead, so buckle up.
The opening days are a bit of a struggle. We start off Thursday morning, August 27th, with the first surf of the period. The water's a balmy 84°F, which is basically normal for this time of year. The wind is a moderate cross-offshore breeze, which is okay, but the swell is a short, weak 7ft from the SSE, with a period of only 8 seconds. The combined energy is weak (624), and honestly, it's a marginal call. The session is likely to be a bit of a fight for average waves. Thursday afternoon cleans up but the swell drops off, so it's not really an improvement.
Friday morning, August 28th, sees the swell shrink further to 4ft, and that period drops to a weak 7 seconds. The wind stays cross-off, and the energy is low (257). It's a clean, small wave day, but not much push. Friday afternoon, the wind swings cross-shore with a moderate breeze and a chop, making it pretty ordinary.
The weekend is pretty flat. Saturday morning, August 29th, has a tiny 2ft swell from the east with a very long period of 12 seconds. The energy is minimal (190). That long period with a clean, cross-offshore wind could make for a few fun little wedges, but it's not going to set the world on fire. Saturday afternoon the wind picks up and it gets messy. Sunday, August 30th, is a glassy, tiny 2ft day with energy at just 117. Glassy conditions are a huge positive, but with no swell, it's more of a paddle-around day. A surfer would call this a "flat spell with a few tiny bumps."
Monday and Tuesday are a write-off. We get a jump in swell on Monday, but it's onshore, rainy, and stormy. The conditions are poor. By Tuesday, September 1st, the swell ramps up big time to 10ft from the SE. The combined energy jumps to 2248, which is very strong, but unfortunately, it's accompanied by a fresh onshore breeze gusting to 22 mph. This is a major, messy, stormy swell. For a reef break, this is going to be a washing machine, and it's clearly for experts only *if they are extremely desperate and lucky*. The "poor surf conditions" tag says it all. This pattern of strong, stormy, and messy continues right through Wednesday, September 2nd, with 12ft of swell and 25 mph cross-shore winds. The energy is massive (2373), but the quality is terrible. Honestly, this stretch looks more interesting for a kite surfer than a paddle surfer with that much wind and swell.
Then, we get a standout window. Thursday morning, September 3rd, is our best bet. The conditions are described as "excellent surf conditions for experienced surfers," and that's a rare high rating. We have a solid 10ft swell from the SE, with a moderate 10-second period, but the wind is a light, clean cross-offshore breeze from the west. The combined energy is still very strong at 1822. This is a big, powerful, clean swell hitting the reef. It's going to be a serious session for experienced surfers only. This is the clear standout. The afternoon on Thursday goes back to being onshore and messy, so you need to be out early.
After that, the forecast gets messy again. Friday, September 4th, through the weekend of September 5th and 6th, is dominated by strong onshore winds again, though the swell stays in the 5ft to 10ft range. The wind is the problem, making it lumpy and choppy. The consistency is fairly consistent, but the quality is poor.
The following week, from September 7th onward, we see a drop in swell size but the wind remains a persistent issue, mostly onshore or cross-onshore. There is a brief glimmer of hope on the morning of Wednesday, September 9th, with a clean cross-offshore wind and a 3ft swell, but it's marginal. Thursday, September 10th, however, is a real late-period highlight. Both the morning and afternoon sessions are glassy with building swell. The morning has a 6ft swell from the ESE with a short 7-second period, but the glassy wind makes it look promising. The afternoon is even better, with a 6ft E swell, a better 10-second period, and glassy conditions. The combined energy is moderate (594), and the forecast says "very good surf conditions." This is another potential standout, but being so far out, it's a promising but less certain call.
So, the plan is clear: get on it Thursday morning, September 3rd, for the big, clean swell. Keep an eye on Thursday, September 10th, as a potential glassy gem later in the run. The rest of the period is a battle with the wind.
Rusty.
Short Range ForecastLight rain (total 5mm), mostly falling on Thu morning. Warm (max 29°C on Thu morning, min 25°C on Sat night). Wind will be generally light. | Days 4-6 Weather SummaryHeavy rain (total 80mm), heaviest during Tue morning. Warm (max 28°C on Sun morning, min 26°C on Sun night). Winds increasing (calm on Sun morning, strong winds from the SE by Tue night). | ||||||||||||||||||||
Thursday 27 | Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | |||||||||||||||
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) | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | E 13 | E 12 | E 12 | E 12 | E 11 | E 11 | SSE 10 | SE 9 | SE 10 | SE 10 | SE 9 | SE 10 | SE 9 | SE 10 | SE 10 | SE 10 |
Wave Graph | |||||||||||||||||||||
515 | 322 | 277 | 188 | 127 | 123 | 109 | 104 | 97 | 63 | 62 | 220 | 220 | 425 | 985 | 1263 | 1631 | 1265 | 1857 | 2053 | 1845 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross-off | cross-off | cross | cross-off | cross-off | cross | cross-off | glassy | cross-on | on | on | on | on | on | cross-on | cross | cross | cross | cross-off |
High Tide | 6:25PM2.16m | 6:01AM2.21m | 6:50PM2.18m | 6:40AM2.24m | 7:14PM2.19m | 7:18AM2.22m | 7:39PM2.18m | 7:56AM2.15m | 8:04PM2.14m | 8:37AM2.03m | 8:29PM2.09m | 9:23AM1.88m | 8:57PM2.02m | ||||||||
Low Tide | 11:55AM0.25m | 00:12AM0.81m | 12:28PM0.27m | 00:42AM0.68m | 12:59PM0.35m | 1:14AM0.58m | 1:30PM0.47m | 1:47AM0.51m | 1:59PM0.63m | 2:22AM0.49m | 2:29PM0.81m | 3:01AM0.51m | 2:59PM1.00m | ||||||||
5:45 | — | — | 5:46 | — | — | 5:47 | — | — | 5:47 | — | — | 5:48 | — | — | 5:48 | — | — | 5:48 | — | — | |
— | 6:45 | — | — | 6:44 | — | — | 6:42 | — | — | 6:40 | — | — | 6:39 | — | — | 6:38 | — | — | 6:37 | — | |
mm | 2 | — | 3 | — | — | — | — | — | — | — | — | — | 2 | 5 | 17 | 24 | 17 | 15 | 5 | 5 | 5 |
Temp °C | 29 | 29 | 27 | 29 | 29 | 27 | 29 | 29 | 27 | 28 | 28 | 27 | 28 | 28 | 27 | 27 | 27 | 27 | 28 | 28 | 27 |
Feels °C | 31 | 31 | 31 | 31 | 31 | 31 | 30 | 30 | 31 | 31 | 30 | 32 | 29 | 29 | 27 | 27 | 27 | 26 | 27 | 27 | 27 |
Swell 1 Height (m) Direction Period (s) | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 7 | SSE 7 | E 12 | SSE 7 | SSE 7 | SSE 7 | SSE 10 | SE 9 | SE 10 | SE 9 | SE 9 | SE 10 | SE 9 | S 11 | S 10 | S 14 |
515 | 322 | 230 | 188 | 127 | 118 | 74 | 104 | 72 | 51 | 37 | 220 | 220 | 425 | 632 | 951 | 1260 | 1265 | 382 | 320 | 132 | |
Swell 2 Height (m) Direction Period (s) | E 12 | E 12 | E 12 | E 11 | E 13 | E 13 | E 12 | SE 13 | E 12 | E 11 | E 11 | E 11 | E 11 | E 11 | E 11 | E 11 | ENE 11 | E 12 | — | — | — |
104 | 101 | 70 | 37 | 87 | 123 | 109 | 7 | 97 | 63 | 62 | 58 | 58 | 38 | 37 | 20 | 22 | 47 | — | — | — | |
Swell 3 Height (m) Direction Period (s) | E 16 | E 16 | E 15 | E 14 | ESE 10 | SE 15 | SE 13 | SW 10 | SE 11 | SE 9 | SE 10 | E 9 | SSW 9 | SSW 8 | E 14 | E 13 | E 13 | — | — | — | — |
5 | 20 | 38 | 32 | 35 | 9 | 7 | 4 | 5 | 3 | 4 | 2 | 15 | 7 | 4 | 14 | 30 | — | — | — | — | |
Wind waves Height (m) Direction Period (s) | — | — | SSE 8 | — | SSW 7 | — | — | SSE 7 | SW 3 | — | — | — | — | NE 3 | SE 10 | SE 9 | SE 10 | — | SE 10 | SE 10 | SE 10 |
— | — | 277 | — | 55 | — | — | 94 | 3 | — | — | — | — | 1 | 985 | 1263 | 1631 | — | 1857 | 2053 | 1845 | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 13 | 314 | 4 | 0 | 312 | 0 | 0 | 314 | 0 | 0 | 46 | 43 | 46 | 299 | 286 | 831 | 498 | 236 | 236 | 236 | 503 |
Best forecast wave conditions in Kyu Shu | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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Information about the Uchiumi Surf forecast
The above surf forecast table for Uchiumi provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Uchiumi can be found by selecting the local surf guide option on the grey menu. Our Uchiumi 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 (Uchiumi) 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 Uchiumi 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.
Uchiumi is 19 km (12 miles) from Miyazaki-shi. If you plan a holiday in Kyu Shu, look for hotels and other accommodation in Miyazaki-shi. Miyazaki-shi has rooms for a wide range of budgets as well as car hire and transport links.











