Surf Forecasts:
Furnas surf forecast from 16 Sep 2026:
- Best quality surf: Saturday 19 Sep, 7AM (local time) - 8ft (2.5m), 14s period, NNW swell with cross-offshore winds.
- Most powerful swell: Saturday 19 Sep, 1AM (local time) - 8ft (2.5m), 15s period, NNW swell with 3,072 kJ wave energy.
- Next surfable swell (1★+): Saturday 19 Sep, 7AM (local time) - 8ft (2.5m), 14s period with NNW swell.
Best Forecast Surf Conditions for Furnas this week:
The surf forecast for Furnas over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Sep 19) at 7AM. The primary swell is predicted to be 2.5m and 14s period with a secondary swell of 0.1m and 14s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Furnas in the next 16 days are 2.5m 15s and forecast to arrive on Saturday (Sep 19) at 1AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.2m 5s period and expected on Monday (Sep 21) at 4AM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 7AM (Sat 19th Sep) | 8ft (2.5m) 14s |
| Best Surf | 7AM (Sat 19th Sep) | 8ft (2.5m) 14s |
| Most Powerful | 1AM (Sat 19th Sep) | 8ft (2.5m) 15s |
Table - best surf conditions forecast for Furnas over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let's chew the fat over what's brewing for Furnas.
First few days? A total write-off. Strong winds and junk surf means you're better off waxing your deck at home. Wednesday and Thursday aren't worth a second look.
But mark your calendars for Saturday the 19th. Saturday morning is pure magic—a glassy, ENE wind at a dead calm and a solid 8ft groundswell out of the NNW with a very long period of 14 seconds. The wave energy is cooking at (2420), and that's a powerful, heavy wave. This is a reef break, and a swell over 8ft with that kind of period is for experts only—this is a heavy, serious wave that will test your skills. The water temp is pretty much what you'd expect for mid-September.
Sunday the 20th is a much more user-friendly option. You've got a 6ft groundswell from the NNW, still a nice 12-second period, and the morning brings a light ESE cross-offshore wind. It's clean, decent power (835), and way more manageable for a good crew.
Monday the 21st brings a smaller, glassy morning with 3ft waves and a cross-offshore breeze. It's on the weaker side for energy (517), but perfect for a longboard or a fun twin-fin.
Then, Wednesday the 23rd morning is another standout for the bigger-wave crew. It's dead calm, glassy, with 6ft waves from the NW and a very long 15-second period. The energy is back up strong (1476). This is a proper groundswell—clean, powerful, and for those who know what they're doing.
The back half of the forecast gets a bit sloppy. Around the 28th and 29th of September, we see bigger sets—8ft and 7ft—but the wind turns cross or cross-onshore, chopping up the surface. That's more of a kite-surfing setup than a clean paddle session.
So, to sum it up: Saturday the 19th morning and Wednesday the 23rd morning are the ones for the experienced chargers. Sunday the 20th morning is your all-round best bet for clean, powerful waves without the intimidation factor.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Thu morning, min 17°C on Tue night). Winds decreasing (strong winds from the N on Tue night, moderate winds from the NNE by Wed night). | Days 4-6 Weather SummaryMostly dry. Warm (max 28°C on Sun morning, min 19°C on Fri night). Wind will be generally light. | ||||||||||||||||||||
Wednesday 16 | Thursday 17 | Friday 18 | Saturday 19 | Sunday 20 | Monday 21 | Tuesday 22 | |||||||||||||||
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) | NNW 9 | NNW 9 | NNW 10 | NNW 9 | NNW 9 | NNW 9 | NNW 8 | NNW 8 | NNW 15 | NNW 14 | NW 13 | NNW 13 | NNW 12 | NNW 11 | NNW 11 | NW 13 | NW 12 | NW 12 | NW 12 | NW 12 | NW 16 |
Wave Graph  | |||||||||||||||||||||
 kJ | 1494 | 1494 | 2179 | 1291 | 974 | 1034 | 864 | 421 | 3072 | 2412 | 1623 | 1049 | 835 | 739 | 513 | 265 | 635 | 469 | 383 | 303 | 1097 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross-off | cross | cross | cross | cross | cross | glassy | cross-on | cross | cross-off | cross-on | cross-off | cross-off | cross-on | cross-off | glassy | on | cross |
High Tide | 6:12AM2.52m | 6:33PM2.34m | 6:50AM2.33m | 7:16PM2.10m | 7:38AM2.13m | 8:17PM1.89m | 8:53AM1.98m | 9:56PM1.79m | 10:37AM1.96m | 11:35PM1.86m | 11:58AM2.10m | 00:36AM2.03m | 12:50PM2.30m | 1:18AM2.22m | |||||||
Low Tide | 12:18PM0.56m | 00:31AM0.71m | 1:00PM0.78m | 1:12AM0.93m | 1:56PM0.99m | 2:12AM1.12m | 3:26PM1.13m | 3:54AM1.20m | 5:18PM1.09m | 5:35AM1.11m | 6:27PM0.92m | 6:34AM0.93m | 7:10PM0.72m | ||||||||
 | |  | |  |  | | | | | | | | | | | | | | | | |
 | 7:18 | — | — | 7:20 | — | — | 7:20 | — | — | 7:22 | — | — | 7:22 | — | — | 7:22 | — | — | 7:24 | — | — |
 | — | 7:45 | — | — | 7:43 | — | — | 7:42 | — | — | 7:39 | — | — | 7:38 | — | — | 7:37 | — | — | 7:35 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 19 | 19 | 19 | 21 | 20 | 18 | 21 | 21 | 19 | 24 | 23 | 23 | 28 | 27 | 26 | 28 | 27 | 27 | 26 | 24 | 23 |
Feels °C | 13 | 12 | 13 | 16 | 15 | 12 | 18 | 17 | 17 | 22 | 22 | 21 | 27 | 25 | 23 | 27 | 25 | 23 | 24 | 22 | 22 |
Swell 1 Height (m) Direction Period (s) | S 13 | SW 13 | S 12 | NNW 9 | S 12 | SW 16 | NW 16 | NW 13 | NNW 15 | NNW 14 | NW 13 | NNW 13 | NNW 12 | NNW 11 | NNW 11 | NW 10 | NW 12 | NW 12 | NW 12 | NW 12 | NW 16 |
| kJ | 3 | 6 | 3 | 1291 | 3 | 10 | 38 | 412 | 3072 | 2412 | 1623 | 1049 | 835 | 739 | 513 | 226 | 635 | 469 | 383 | 303 | 1097 |
Swell 2 Height (m) Direction Period (s) | — | — | — | S 18 | S 16 | S 11 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 | SW 13 | S 13 | S 11 | S 12 | NW 13 | S 12 | S 12 | NNW 4 | WNW 19 | NW 11 |
| kJ | — | — | — | 6 | 5 | 3 | 9 | 8 | 8 | 8 | 7 | 7 | 3 | 3 | 3 | 265 | 3 | 3 | 11 | 248 | 278 |
Swell 3 Height (m) Direction Period (s) | — | — | — | S 12 | — | — | — | S 11 | SW 14 | — | — | — | — | SW 13 | S 12 | NNW 6 | S 12 | — | S 12 | NNW 5 | — |
| kJ | — | — | — | 3 | — | — | — | 2 | 8 | — | — | — | — | 6 | 3 | 26 | 3 | — | 3 | 14 | — |
Wind waves Height (m) Direction Period (s) | NNW 9 | NNW 9 | NNW 10 | — | NNW 9 | NNW 9 | NNW 8 | NNW 8 | — | — | — | — | — | — | — | — | NW 3 | NNW 4 | — | — | — |
| kJ | 1494 | 1494 | 2179 | — | 974 | 1034 | 864 | 421 | — | — | — | — | — | — | — | — | 3 | 9 | — | — | — |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 677 | 331 | 122 | 26 | 429 | 122 | 26 | 215 | 23 | 0 | 23 | 26 | 0 | 27 | 0 | 0 | 23 | 23 | 0 | 211 | 23 |
Best forecast wave conditions in Ericeira | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
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Information about the Furnas Surf forecast
The above surf forecast table for Furnas provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Furnas can be found by selecting the local surf guide option on the grey menu. Our 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 (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 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.
Furnas is 12 km (7 miles) from the city of Sintra. If you plan a holiday in Ericeira, look for hotels and other accommodation in Sintra. Sintra has rooms for a wide range of budgets as well as car hire and transport links.
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