Surf Forecasts:
Playa de Rio Sieira / As Furnas surf forecast from 14 Sep 2026:
- Best quality surf: Monday 21 Sep, 2AM (local time) - 3.5ft (1.1m), 14s period, NW swell with cross-offshore winds.
- Most powerful swell: Friday 18 Sep, 11PM (local time) - 6.5ft (2.0m), 14s period, NW swell with 1,514 kJ wave energy.
- Next surfable swell (1★+): Monday 14 Sep, 5PM (local time) - 2ft (0.6m), 10s period with NW swell.
Best Forecast Surf Conditions for Playa de Rio Sieira / As Furnas this week:
The surf forecast for Playa de Rio Sieira / As Furnas over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Sep 14) at 5PM. The primary swell is predicted to be 0.6m and 10s period with a secondary swell of 0.6m and 9s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Playa de Rio Sieira / As Furnas in the next 16 days are 2.0m 14s and forecast to arrive on Friday (Sep 18) at 11PM. Winds are predicted to be cross-shore at the time the swell arrives.
| Wave Type | Time (CEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 5PM (Mon 14th Sep) | 2ft (0.6m) 10s |
| Best Surf | 2AM (Mon 21st Sep) | 3.5ft (1.1m) 14s |
| Most Powerful | 11PM (Fri 18th Sep) | 6.5ft (2.0m) 14s |
Table - best surf conditions forecast for Playa de Rio Sieira / As Furnas over the next 16 days.
The Lowdown
Alright, let’s talk about what’s cookin’ at Playa de Rio Sieira / As Furnas over the next couple weeks. It’s a slow start, and the wind’s gonna be the boss for a while. Water temp is about 66°F, which is dead normal for this time of year.
First few days are a bust. Monday the 14th has tiny 2ft NW swell, clean enough in the morning and glassy by afternoon, but the energy is weak at 160. It’s surfable, but barely. From Tuesday the 15th through Thursday the 17th, the wind cranks cross-onshore, making everything choppy and lumpy. Not worth the paddle.
Friday the 18th morning throws up a 5ft NW swell with a nice 13-second period, but the wind is cross-shore and messy. The energy hits 853 – moderate – but it’s not clean. By afternoon, it’s 7ft and choppy; that’s for experts only, or maybe kite surfers.
The standout window is Monday the 21st morning. That’s the best of the run. Swell is 5ft from the NW with a long 13-second period, and the wind is glassy from the east at just 3 mph. Energy at 786. Clean, lined-up groundswell. It’s head-high, so beginners might find it a bit much, but everyone else, this is the one. Tuesday the 22nd morning also has clean 3ft NW swell.
Size drops off after that, but Friday the 25th morning is another good one: 5ft WNW swell, very long 13-second period, and glassy wind. Energy is 659. That’ll be fun and clean, though the long period might make it a little straight at the beach.
The rest of the run is mostly small, under 3ft, but Saturday the 26th afternoon has a glassy 3ft NW swell that could be a nice, easy session to wrap up.
Bottom line: first week is a wash. Circle Monday the 21st for the best size, period, and glass, and Friday the 25th for another clean runner. Crowds are possible here, so expect some company.
Rusty.
Short Range ForecastMostly dry. Warm (max 26°C on Mon morning, min 16°C on Wed night). Winds increasing (calm on Mon night, fresh winds from the NNW by Tue afternoon). | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Sat night, min 15°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Monday 14 | Tuesday 15 | Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | |||||||||||||||
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) | NW 11 | NW 10 | W 8 | WNW 11 | WNW 10 | WNW 8 | WNW 10 | NW 12 | NW 11 | NW 10 | NW 10 | NW 9 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 11 | NW 11 | NW 10 | NW 14 |
Wave Graph  | |||||||||||||||||||||
 kJ | 94 | 64 | 51 | 48 | 95 | 198 | 320 | 568 | 462 | 315 | 188 | 135 | 839 | 1339 | 1172 | 653 | 555 | 413 | 254 | 226 | 471 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | glassy | glassy | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross-on | cross | cross-on | cross | cross | on | cross-off | cross-off | on | cross-off |
High Tide | 6:49PM3.04m | 7:06AM2.91m | 7:24PM2.80m | 7:40AM2.73m | 8:00PM2.54m | 8:17AM2.52m | 8:42PM2.28m | 9:04AM2.31m | 9:39PM2.06m | 10:15AM2.14m | 11:13PM1.93m | 11:59AM2.11m | 00:57AM1.99m | ||||||||
Low Tide | 12:36PM0.17m | 00:55AM0.27m | 1:11PM0.35m | 1:27AM0.50m | 1:48PM0.57m | 2:02AM0.74m | 2:30PM0.82m | 2:42AM0.97m | 3:24PM1.05m | 3:41AM1.18m | 4:49PM1.20m | 5:18AM1.28m | 6:39PM1.18m | ||||||||
 |  | | |  | | | | | | | | | | | | | | | | | |
 | 8:14 | — | — | 8:15 | — | — | 8:15 | — | — | 8:17 | — | — | 8:18 | — | — | 8:18 | — | — | 8:19 | — | — |
 | — | 8:47 | — | — | 8:46 | — | — | 8:45 | — | — | 8:43 | — | — | 8:40 | — | — | 8:39 | — | — | 8:37 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 26 | 26 | 22 | 20 | 24 | 18 | 18 | 22 | 19 | 17 | 21 | 19 | 18 | 26 | 21 | 19 | 27 | 28 | 26 | 29 | 28 |
Feels °C | 25 | 25 | 23 | 20 | 21 | 15 | 14 | 17 | 14 | 14 | 18 | 15 | 15 | 21 | 17 | 17 | 24 | 26 | 23 | 27 | 26 |
Swell 1 Height (m) Direction Period (s) | WNW 9 | W 9 | W 8 | W 8 | WNW 10 | WNW 8 | WNW 10 | NW 12 | NW 11 | NW 10 | NW 10 | NW 9 | NW 13 | NW 13 | NW 13 | NW 13 | NW 12 | NW 11 | NW 11 | NW 10 | NW 14 |
| kJ | 64 | 57 | 51 | 33 | 95 | 198 | 320 | 568 | 462 | 315 | 188 | 135 | 839 | 1339 | 1172 | 653 | 555 | 413 | 254 | 226 | 471 |
Swell 2 Height (m) Direction Period (s) | NW 11 | NW 10 | NW 10 | WNW 11 | WNW 8 | S 13 | NW 11 | S 13 | SW 13 | S 12 | S 18 | SW 16 | SW 16 | SW 16 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | NW 16 | NW 10 |
| kJ | 94 | 64 | 34 | 48 | 20 | 4 | 32 | 3 | 7 | 3 | 6 | 10 | 10 | 10 | 8 | 8 | 8 | 7 | 7 | 68 | 110 |
Swell 3 Height (m) Direction Period (s) | S 11 | S 11 | NW 13 | NW 9 | S 10 | S 13 | WNW 13 | — | — | — | S 12 | S 12 | S 12 | — | — | S 11 | — | — | W 18 | SW 13 | SW 13 |
| kJ | 2 | 2 | 6 | 20 | 2 | 4 | 18 | — | — | — | 3 | 3 | 3 | — | — | 2 | — | — | 6 | 7 | 7 |
Wind waves Height (m) Direction Period (s) | — | — | — | NW 5 | NNW 4 | N 4 | N 3 | NNW 4 | NNE 4 | NNE 3 | NNW 4 | NNE 3 | NNE 3 | N 3 | N 3 | — | NW 2 | — | — | — | — |
| kJ | — | — | — | 15 | 35 | 14 | 8 | 19 | 10 | 3 | 16 | 3 | 1 | 8 | 5 | — | 2 | — | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 0 | 0 | 0 | 6 | 721 | 416 | 289 | 416 | 24 | 92 | 113 | 14 | 6 | 179 | 6 | 6 | 24 | 0 | 0 | 46 | 0 |
Best forecast wave conditions in Galicia | |||||||||||||||||||||
Best forecast wave conditions in Spain (Europe) | |||||||||||||||||||||
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Information about the Playa de Rio Sieira / As Furnas Surf forecast
The above surf forecast table for Playa de Rio Sieira / As Furnas provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Playa de Rio Sieira / As Furnas can be found by selecting the local surf guide option on the grey menu. Our Playa de Rio Sieira / As Furnas 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 (Playa de Rio Sieira / As Furnas) 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 Playa de Rio Sieira / As Furnas 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 Galicia? If you are looking for accommodation near Playa de Rio Sieira / As Furnas, camping, hotels and holiday cottages in Galicia, consider staying in Boiro which is 12 km (7 miles) away. Other places in and around Galicia where you can find information about places to rent, and car hire include Muros which is 16 km (10 miles) away, Villagarcia, Sanxenxo and Poio.
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