Surf Forecasts:
Sao Jacinto surf forecast from 28 Aug 2026:
- Best quality surf: Saturday 29 Aug, 7AM (local time) - 4.5ft (1.3m), 9s period, WNW swell with glassy winds.
- Most powerful swell: Friday 28 Aug, 10PM (local time) - 5.5ft (1.7m), 10s period, WNW swell with 544 kJ wave energy.
- Next surfable swell (1★+): Saturday 29 Aug, 7AM (local time) - 4.5ft (1.3m), 9s period with WNW swell.
Best Forecast Surf Conditions for Sao Jacinto this week:
The surf forecast for Sao Jacinto over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 29) at 7AM. The primary swell is predicted to be 1.3m and 9s period. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Sao Jacinto in the next 16 days are 1.7m 10s and forecast to arrive on Friday (Aug 28) at 10PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 15s period and expected on Wednesday (Sep 02) at 10AM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Sat 29th Aug) | 4.5ft (1.3m) 9s |
| Best Surf | 7AM (Sat 29th Aug) | 4.5ft (1.3m) 9s |
| Most Powerful | 10PM (Fri 28th Aug) | 5.5ft (1.7m) 10s |
Table - best surf conditions forecast for Sao Jacinto over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down what’s coming up for our local stretch of sand.
The first real window of clean surf is gonna be Friday morning, August 28th. The swell is hitting 6ft from the WNW with a period of 11 seconds, and combined wave energy is sitting at 718 – that’s solid, moderate energy with some proper grunt behind it. The wind is SSE at 9 mph, which is cross-offshore, keeping things clean. That’s about as good as it gets for this stretch, and the water temp is 66°, which is pretty normal for this time of year. The sandbar setup at Sao Jacinto can be a bit inconsistent, but when it lines up like this, it’s a real treat. The swell direction is from the WNW, which is straight into the optimum for this break. Keep in mind, the crowds are sometimes an issue here, so if you can get out early, you’ll be laughing.
After that Friday morning peak, the conditions drop off pretty quick. Friday afternoon turns onshore and messy, and then we’re looking at a long, dry spell. Saturday morning the 29th has a tiny 4ft swell with a glassy wind, but the energy is weak (193) and the period is only 8 seconds – it’s surfable but very ordinary. From Saturday afternoon right through to the morning of September 10th, it’s pretty much a write-off. Days of onshore cross-winds, lumpy chop, and small swell. There’s a gap of about ten days where the surf is poor to non-existent.
Finally, on Thursday morning, September 10th, we get a bit of a reprieve. The swell bumps up to 5ft from the NW, but the period is short – only 6 seconds – so it’s a bit of a windswell. The wind is light from the south at 3 mph, which is cross-offshore, so the surface will be clean. Combined energy is 202, which is moderate. It’s not the best quality, but after a long stretch of nothing, it’s something to get out for. The morning looks like the only decent window, as the afternoon goes onshore again.
So, the standout is undeniably Friday morning, August 28th. That’s the one to circle. The rest of the run is mostly a waiting game, with a small, clean opportunity on the morning of September 10th for those who are desperate for a paddle.
Stay tuned, forecasts can change, but for now, that’s the story.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Sun morning, min 17°C on Fri night). Wind will be generally light. | Days 4-6 Weather SummaryMostly dry. Warm (max 27°C on Wed night, min 16°C on Mon night). Wind will be generally light. | ||||||||||||||||||||
Friday 28 | Saturday 29 | Sunday 30 | Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | |||||||||||||||
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) | WNW 11 | WNW 10 | WNW 10 | WNW 8 | WNW 8 | WNW 8 | WNW 9 | WNW 9 | WNW 9 | NW 11 | NW 10 | NW 10 | WNW 9 | NW 9 | NW 8 | NW 7 | NW 7 | NW 7 | NW 7 | NW 7 | NW 8 |
Wave Graph  | |||||||||||||||||||||
 kJ | 718 | 703 | 443 | 193 | 130 | 130 | 221 | 221 | 165 | 328 | 432 | 334 | 148 | 393 | 324 | 121 | 134 | 109 | 55 | 45 | 28 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | on | cross | glassy | on | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross-on | cross | off | cross-on | cross |
High Tide | 4:27PM3.22m | 4:45AM3.10m | 4:57PM3.26m | 5:14AM3.11m | 5:28PM3.26m | 5:45AM3.09m | 6:00PM3.20m | 6:18AM3.02m | 6:35PM3.08m | 6:55AM2.91m | 7:16PM2.91m | 7:39AM2.77m | 8:09PM2.71m | ||||||||
Low Tide | 10:23PM0.78m | 10:33AM0.78m | 10:57PM0.73m | 11:07AM0.75m | 11:31PM0.73m | 11:43AM0.78m | 00:08AM0.79m | 12:21PM0.86m | 00:47AM0.91m | 1:04PM0.99m | 1:31AM1.08m | 1:55PM1.15m | 2:24AM1.27m | ||||||||
 | |  | | | | | | | |  | | | | | | | | | | | |
 | 6:56 | — | — | 6:58 | — | — | 6:58 | — | — | 7:00 | — | — | 7:01 | — | — | 7:01 | — | — | 7:03 | — | — |
 | — | 8:14 | — | — | 8:12 | — | — | 8:10 | — | — | 8:08 | — | — | 8:07 | — | — | 8:06 | — | — | 8:04 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 20 | 19 | 19 | 20 | 20 | 21 | 20 | 19 | 18 | 18 | 18 | 17 | 18 | 19 | 24 | 23 | 27 | 31 | 31 | 29 |
Feels °C | 17 | 19 | 19 | 18 | 19 | 22 | 20 | 19 | 18 | 14 | 15 | 16 | 14 | 14 | 17 | 21 | 19 | 26 | 28 | 26 | 25 |
Swell 1 Height (m) Direction Period (s) | WNW 11 | WNW 10 | WNW 10 | WNW 8 | WNW 8 | WNW 8 | WNW 9 | WNW 9 | WNW 9 | NW 11 | — | NW 10 | WNW 9 | W 15 | NW 8 | NW 7 | SW 16 | NW 7 | NW 7 | W 14 | NW 4 |
| kJ | 718 | 703 | 443 | 193 | 130 | 130 | 221 | 221 | 165 | 328 | — | 334 | 148 | 5 | 324 | 121 | 10 | 109 | 55 | 4 | 9 |
Swell 2 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | W 16 | W 16 | — | W 15 | SW 15 | — | W 16 | W 14 | — | NW 8 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | 5 | 5 | — | 4 | 9 | — | 5 | 4 | — | 28 |
Swell 3 Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | W 10 |
| kJ | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 2 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | NNW 4 | — | NW 10 | — | NW 6 | NW 9 | — | — | NW 7 | — | — | NW 7 | — |
| kJ | — | — | — | — | — | — | — | — | 5 | — | 432 | — | 62 | 393 | — | — | 134 | — | — | 45 | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 218 | 3 | 0 | 213 | 0 | 49 | 213 | 71 | 71 | 213 | 76 | 71 | 243 | 3 | 27 | 295 | 3 | 0 | 114 | 27 |
Best forecast wave conditions in Beira | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
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Information about the Sao Jacinto Surf forecast
The above surf forecast table for Sao Jacinto provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Sao Jacinto can be found by selecting the local surf guide option on the grey menu. Our Sao Jacinto 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 (Sao Jacinto) 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 Sao Jacinto 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.
Sao Jacinto is 9 km (6 miles) from Aveiro. If you plan a holiday in Beira, look for hotels and other accommodation in Aveiro. Aveiro has rooms for a wide range of budgets as well as car hire and transport links.
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