Surf Forecasts:
Uchiumi surf forecast from 9 Aug 2026:
- Best quality surf: Monday 10 Aug, 9PM (local time) - 4ft (1.2m), 12s period, E swell with glassy winds.
- Most powerful swell: Sunday 9 Aug, 6PM (local time) - 6ft (1.9m), 14s period, ESE swell with 1,475 kJ wave energy.
- Next surfable swell (1★+): Monday 10 Aug, 9PM (local time) - 4ft (1.2m), 12s period with E 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 Monday (Aug 10) at 9PM. The primary swell is predicted to be 1.2m and 12s period with a secondary swell of 1.0m and 10s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Uchiumi in the next 16 days are 1.9m 14s and forecast to arrive on Sunday (Aug 09) at 6PM. Winds are predicted to be onshore at the time the swell arrives.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9PM (Mon 10th Aug) | 4ft (1.2m) 12s |
| Best Surf | 9PM (Mon 10th Aug) | 4ft (1.2m) 12s |
| Most Powerful | 6PM (Sun 9th Aug) | 6ft (1.9m) 14s |
Table - best surf conditions forecast for Uchiumi over the next 16 days.
The Lowdown
G'day, Rusty here, and I gotta be straight with you—this outlook for Uchiumi is a bit of a tough one. We're looking at a 16-day window that starts with a whole lot of nothing, then a couple of brief windows that might get your hopes up before it all fades again. The water is sitting at a warm 84°F, which is about average for this time of year, so at least the dip won't be a shock to the system.
The first real chance to paddle out doesn't come until the morning of Monday, August 11th. That Tuesday morning, the 11th, is the standout. The wind drops to glassy—dead calm, 0 mph—and we've got a clean 4ft swell rolling in from the east with a solid 12-second period. The combined energy is moderate (577), and with those conditions, Uchiumi is going to be as smooth as glass. The swell direction is coming from the east, but the optimum for this reef break is from the southeast, so it's not a perfect match, but the glassy conditions will make up for it. This is the best you're going to get.
After that Tuesday morning, it falls apart. The wind swings cross-onshore and the swell drops. From Wednesday the 12th right through to the 18th, it's mostly poor surf conditions with weak, choppy waves. There's a little bump on the 15th and 16th with 3ft to 4ft swell, but the wind is messy and cross-onshore, so it's just not worth the effort.
Then, on the morning of Wednesday, August 19th, we get another glassy window. The swell is tiny at 2ft from the east, with a 10-second period, and the combined energy is weak (117). It's surfable, but very ordinary. The crowd situation at Uchiumi is "often," so expect company even on these small days.
From the 20th onwards, it's a mixed bag of poor to marginal conditions. The end of the forecast week, around the 24th, sees a bit more energy come back into the water with a swell from the south-southeast, hitting 3ft with a 11-second period and moderate energy (541). But the wind is from the south-southeast, making it a cross-onshore breeze, so it's still choppy and not really a goer.
Overall, you've got one clear window: Tuesday morning, August 11th. That's your pick. Everything else is either too small, too windy, or just plain messy.
Rusty.
Short Range ForecastLight rain (total 9mm), mostly falling on Sun morning. Warm (max 28°C on Sun afternoon, min 25°C on Mon night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 18mm), heaviest on Thu afternoon. Warm (max 27°C on Wed afternoon, min 24°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sunday 9 | Monday 10 | Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | |||||||||||||||
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) | ESE 8 | ESE 8 | ESE 14 | E 13 | E 12 | E 12 | E 12 | E 11 | E 11 | E 10 | E 10 | E 10 | E 10 | E 10 | S 9 | S 9 | E 10 | E 9 | E 10 | E 10 | E 10 |
Wave Graph  | |||||||||||||||||||||
 kJ | 587 | 593 | 1090 | 771 | 603 | 416 | 400 | 298 | 185 | 198 | 212 | 171 | 71 | 71 | 55 | 41 | 68 | 113 | 159 | 202 | 239 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | on | cross-on | on | on | glassy | glassy | cross | glassy | cross-on | cross-on | on | cross-on | cross-on | glassy | cross-on | on | glassy | cross-on | on | cross-off |
High Tide | 4:58PM1.85m | 3:13AM1.86m | 5:33PM1.97m | 4:12AM1.96m | 6:03PM2.06m | 5:01AM2.07m | 6:31PM2.13m | 5:44AM2.15m | 6:57PM2.16m | 6:25AM2.20m | 7:23PM2.17m | 7:04AM2.21m | 7:48PM2.17m | ||||||||
Low Tide | 9:33AM0.47m | 10:08PM1.38m | 10:25AM0.34m | 10:56PM1.27m | 11:09AM0.24m | 11:33PM1.13m | 11:47AM0.18m | 00:07AM1.00m | 12:23PM0.17m | 00:39AM0.87m | 12:56PM0.22m | 1:12AM0.76m | 1:28PM0.32m | 1:45AM0.68m | |||||||
 |  |  |  |  | |  | | | | | | | |  | | |  | | | | |
 | 5:33 | — | — | 5:35 | — | — | 5:35 | — | — | 5:35 | — | — | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — |
 | — | 7:04 | — | — | 7:02 | — | — | 7:01 | — | — | 7:00 | — | — | 7:00 | — | — | 6:59 | — | — | 6:58 | — |
mm | 7 | 2 | — | — | — | — | — | — | — | — | — | — | 2 | 4 | 6 | 4 | 1 | 1 | — | — | — |
Temp °C | 27 | 28 | 27 | 27 | 28 | 27 | 28 | 28 | 27 | 26 | 27 | 26 | 26 | 27 | 26 | 27 | 27 | 26 | 27 | 27 | 26 |
Feels °C | 28 | 30 | 30 | 30 | 32 | 33 | 31 | 30 | 31 | 26 | 29 | 29 | 28 | 28 | 29 | 30 | 30 | 29 | 29 | 30 | 30 |
Swell 1 Height (m) Direction Period (s) | ESE 8 | ESE 8 | ESE 14 | E 13 | E 12 | E 12 | E 12 | E 11 | E 11 | E 10 | E 10 | E 10 | E 10 | S 9 | S 9 | S 9 | E 10 | E 9 | E 10 | E 10 | E 10 |
| kJ | 587 | 593 | 1090 | 771 | 603 | 416 | 400 | 298 | 185 | 198 | 212 | 171 | 71 | 57 | 55 | 39 | 68 | 113 | 159 | 202 | 239 |
Swell 2 Height (m) Direction Period (s) | S 11 | S 11 | S 10 | S 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | SSE 10 | S 10 | S 9 | S 9 | E 10 | E 10 | E 9 | S 8 | S 8 | S 10 | S 9 | S 8 |
| kJ | 235 | 188 | 250 | 200 | 205 | 222 | 170 | 177 | 139 | 133 | 94 | 83 | 59 | 71 | 45 | 41 | 37 | 35 | 48 | 42 | 36 |
Swell 3 Height (m) Direction Period (s) | E 14 | SE 15 | ESE 15 | ESE 7 | SW 11 | ESE 14 | SE 13 | ESE 13 | NNE 4 | ENE 12 | E 12 | ESE 12 | ESE 12 | ESE 12 | ENE 5 | E 11 | SE 11 | SE 11 | SE 11 | — | ESE 9 |
| kJ | 106 | 9 | 21 | 41 | 20 | 18 | 7 | 17 | 2 | 117 | 48 | 14 | 14 | 14 | 4 | 21 | 5 | 4 | 29 | — | 34 |
Wind waves Height (m) Direction Period (s) | — | SE 8 | ESE 7 | — | — | — | — | — | — | NE 5 | NE 5 | — | — | ENE 3 | NE 5 | NE 5 | ENE 5 | — | — | — | — |
| kJ | — | 221 | 134 | — | — | — | — | — | — | 18 | 22 | — | — | 2 | 5 | 7 | 5 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 205 | 205 | 43 | 43 | 46 | 0 | 0 | 205 | 0 | 43 | 299 | 13 | 46 | 46 | 0 | 236 | 46 | 0 | 15 | 46 | 0 |
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.
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