Surf Forecasts:
Uchizuma surf forecast from 8 Sep 2026:
- Best quality surf: Wednesday 9 Sep, 12AM (local time) - 10ft (3.0m), 10s period, SSE swell with glassy winds.
- Most powerful swell: Wednesday 9 Sep, 9AM (local time) - 10ft (3.0m), 9s period, SSE swell with 1,414 kJ wave energy.
- Next surfable swell (1★+): Tuesday 8 Sep, 3PM (local time) - 6ft (1.8m), 9s period with S swell.
Best Forecast Surf Conditions for Uchizuma this week:
The surf forecast for Uchizuma over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 08) at 3PM. The primary swell is predicted to be 1.8m and 9s period with a secondary swell of 1.4m and 8s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Uchizuma in the next 16 days are 3.0m 9s and forecast to arrive on Wednesday (Sep 09) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.3m 5s period and expected on Wednesday (Sep 09) at 9PM.
| Wave Type | Time (JST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 3PM (Tue 8th Sep) | 6ft (1.8m) 9s |
| Best Surf | 12AM (Wed 9th Sep) | 10ft (3.0m) 10s |
| Most Powerful | 9AM (Wed 9th Sep) | 10ft (3.0m) 9s |
Table - best surf conditions forecast for Uchizuma over the next 16 days.
The Lowdown
Alright, surfers, Rusty here. Let's have a look at what's on the table for the next couple of weeks.
Right off the bat, it's a slow start. We're looking at Uchizuma, and the first few days are pretty ordinary. The water’s a touch warmer than normal for this time of year, sitting at 83°F.
Tuesday the 8th kicks off with some stormy weather and a southerly swell around 5ft, but it's a short period and cross-shore wind, so it's messy. The wave energy is moderate at 590. Not a day to get excited about.
We then have a rough patch. Wednesday the 9th sees the swell jump to 10ft, but the wind is howling onshore with a storm risk, so that's a complete write-off. Thursday and Friday the 10th and 11th are a bit better, with clean conditions and a dropping swell, but the waves are small and weak – around 3ft to 4ft with energy in the 100-200 range. By Saturday the 12th, we're down to knee-high dribble.
Honestly, the first week is a slog. The real action starts to build from the 14th. Monday the 14th sees a glassy, clean morning with a 4ft swell from the ESE, and the energy jumps to 488. The afternoon looks even better with a 5ft swell and zero wind. Tuesday the 15th morning holds similar clean conditions at 4ft. That's the best of the first week.
But hold on to your boards. The standout is Sunday the 21st of September. The morning brings a dreamy 6ft groundswell from the SE, with an incredibly long period of 16 seconds. The energy is massive at 2300, with a gentle offshore NNW wind. This is proper, powerful stuff. The afternoon is a bit bigger at 8ft, but the wind is stronger, so it's more for the experienced crew. Monday the 22nd continues the run with offshore winds and 8ft swell, still with that long-period energy (3433). This is the one to mark on the calendar – a long-range promise that looks seriously good. The long period means those waves will have real shape and power, especially at a point or reef setup.
After that, the swell backs off quickly into the 23rd. The wind stays clean, but the size drops away.
So, the call is clear: the first week is a patience game. The highlight is definitely the 21st and 22nd of September at Uchizuma, with that SE groundswell and offshore winds. That's the one.
Rusty.
Short Range ForecastHeavy rain (total 58mm), heaviest during Tue morning. Warm (max 28°C on Tue afternoon, min 21°C on Wed night). Wind will be generally light. | Days 4-6 Weather SummaryModerate rain (total 13mm), heaviest on Sat afternoon. Warm (max 28°C on Sun morning, min 24°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Tuesday 8 | Wednesday 9 | Thursday 10 | Friday 11 | Saturday 12 | Sunday 13 | Monday 14 | |||||||||||||||
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) | S 9 | S 9 | SSE 10 | SSE 9 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 7 | E 14 | ESE 9 | ESE 9 | SE 9 | ESE 9 | SE 8 | ESE 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 327 | 539 | 1382 | 1414 | 785 | 243 | 188 | 184 | 171 | 123 | 145 | 94 | 52 | 40 | 35 | 47 | 59 | 83 | 328 | 295 | 313 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | glassy | glassy | cross-on | cross-on | cross-off | cross-off | cross-off | cross-off | glassy | glassy | glassy | glassy | cross | glassy | cross-on | on | cross-on | cross-on | on | glassy |
High Tide | 4:52PM1.68m | 3:59AM1.68m | 5:21PM1.76m | 4:49AM1.79m | 5:47PM1.81m | 5:34AM1.87m | 6:13PM1.84m | 6:15AM1.89m | 6:37PM1.84m | 6:54AM1.85m | 7:00PM1.83m | 7:31AM1.78m | 7:22PM1.79m | ||||||||
Low Tide | 9:55AM0.25m | 10:28PM0.91m | 10:41AM0.18m | 11:04PM0.73m | 11:20AM0.16m | 11:38PM0.57m | 11:55AM0.21m | 00:11AM0.43m | 12:27PM0.30m | 00:43AM0.33m | 12:57PM0.43m | 1:15AM0.29m | 1:24PM0.57m | 1:46AM0.29m | |||||||
 | |  | | |  |  |  | | | |  | | |  |  | |  | | |  | |
 | 5:39 | — | — | 5:41 | — | — | 5:41 | — | — | 5:41 | — | — | 5:43 | — | — | 5:43 | — | — | 5:43 | — | — |
 | — | 6:19 | — | — | 6:17 | — | — | 6:16 | — | — | 6:15 | — | — | 6:14 | — | — | 6:13 | — | — | 6:10 | — |
mm | 19 | 9 | 12 | 5 | 6 | 5 | 1 | — | 1 | 1 | 2 | — | 1 | 4 | — | — | 1 | 4 | 1 | — | 6 |
Temp °C | 26 | 28 | 27 | 27 | 27 | 22 | 23 | 23 | 23 | 25 | 25 | 24 | 26 | 26 | 25 | 28 | 28 | 25 | 28 | 28 | 25 |
Feels °C | 30 | 34 | 33 | 31 | 32 | 22 | 24 | 24 | 25 | 29 | 30 | 28 | 31 | 31 | 31 | 31 | 31 | 30 | 31 | 31 | 30 |
Swell 1 Height (m) Direction Period (s) | S 9 | S 9 | SSE 10 | E 18 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 8 | SSE 7 | SSE 7 | SSE 7 | S 7 | ESE 9 | ESE 9 | ESE 5 | SE 9 | SSW 10 | ESE 9 |
| kJ | 327 | 539 | 1153 | 6 | 785 | 243 | 188 | 184 | 171 | 123 | 145 | 94 | 52 | 40 | 23 | 47 | 59 | 34 | 174 | 19 | 313 |
Swell 2 Height (m) Direction Period (s) | SE 8 | SE 8 | — | — | E 18 | E 16 | E 16 | E 15 | ESE 11 | E 15 | E 14 | SE 10 | SE 10 | SE 10 | ESE 10 | S 7 | S 7 | SE 9 | SSW 8 | E 12 | SSW 9 |
| kJ | 182 | 210 | — | — | 6 | 5 | 5 | 4 | 12 | 17 | 15 | 24 | 24 | 25 | 35 | 15 | 15 | 83 | 13 | 12 | 16 |
Swell 3 Height (m) Direction Period (s) | — | ESE 10 | — | — | — | — | — | E 18 | E 15 | E 10 | E 14 | E 14 | E 13 | E 14 | E 14 | E 13 | E 13 | S 7 | E 13 | E 16 | E 13 |
| kJ | — | 39 | — | — | — | — | — | 6 | 17 | 7 | 60 | 36 | 31 | 32 | 35 | 31 | 31 | 8 | 13 | 5 | 50 |
Wind waves Height (m) Direction Period (s) | NE 3 | — | SSE 10 | SSE 9 | — | NNE 6 | NNE 5 | NNE 4 | NE 3 | NNE 3 | NE 4 | NE 4 | NE 3 | NE 3 | — | — | ESE 4 | — | ESE 9 | SE 8 | — |
| kJ | 3 | — | 1382 | 1414 | — | 74 | 39 | 13 | 3 | 4 | 11 | 4 | 3 | 2 | — | — | 7 | — | 328 | 295 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 21 | 0 | 0 | 246 | 11 | 15 | 15 | 0 | 0 | 0 | 0 | 0 | 0 | 40 | 0 | 43 | 19 | 19 | 19 | 19 | 0 |
Best forecast wave conditions in Shikoku | |||||||||||||||||||||
Best forecast wave conditions in Japan | |||||||||||||||||||||
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Information about the Uchizuma Surf forecast
The above surf forecast table for Uchizuma provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Uchizuma can be found by selecting the local surf guide option on the grey menu. Our Uchizuma 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 (Uchizuma) 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 Uchizuma 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.
Are you planning a holiday in Shikoku? If you are looking for accommodation near Uchizuma, camping, hotels and holiday cottages in Shikoku, consider staying in Anan which is 40 km (25 miles) away. Other places in and around Shikoku where you can find information about places to rent, and car hire include Muroto which is 45 km (28 miles) away, Komatsushima, Aki and Kamojima.
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