Surf Forecasts:
Bicas surf forecast from 11 Aug 2026:
- Most powerful swell: Tuesday 18 Aug, 7AM (local time) - 5.5ft (1.7m), 9s period, NNW swell with 430 kJ wave energy.
Best Forecast Surf Conditions for Bicas this week:
The most powerful waves expected at Bicas in the next 16 days are 1.7m 9s and forecast to arrive on Tuesday (Aug 18) at 7AM. Winds are predicted to be cross-onshore at the time the swell arrives.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | - | - |
| Best Surf | - | - |
| Most Powerful | 7AM (Tue 18th Aug) | 5.5ft (1.7m) 9s |
Table - best surf conditions forecast for Bicas over the next 16 days.
The Lowdown
Alright, Rusty here. Let's break down what's happening at Bicas.
Well, I'm not gonna sugarcoat it – the next week and a half is pretty grim. We've got a long stretch of junk conditions from now through to the 17th of August. The wind's just constantly hammering onshore from the northwest, tearing up what little surf there is. The energy readings are weak, mostly in the double digits and low triple digits for that first week – barely enough to get your board wet. That tiny 0.7ft swell on the 11th morning? Forget it, with a 9 mph NNW wind right on it.
Now, things finally perk up on Monday, the 18th of August. The morning session is looking clean. We've got a 4ft NW groundswell (9-second period) rolling in, combined energy building to a moderate 310, and the wind eases to a light ENE cross-offshore at just 3 mph. That's our first real shot, but it's still just a glimmer.
Then it goes quiet again until the 24th of August. But mark my words, that Monday morning (24th) is a pearl. The wind is flat calm, dead glass, and we've got a 5ft WNW swell with a combined energy of 392 – that's solid, moderate-to-strong energy. This is the one to save the date for. It's a standout. The swell direction isn't the absolute best for this reef (it prefers a W swell), but with those mirror-flat conditions and decent size, it's going to be clean and have some push. For a spot that rarely breaks, this is a special chance. It's getting big for the average surfer, so be ready.
But the absolute king of this forecast is Tuesday morning, the 25th of August. We're looking at a 6ft NW swell, combined energy is cranking at a massive 759, and again, glassy conditions with barely a 3 mph NW breeze. That's strong, powerful wave energy, good height, and perfect surfaces. This is one for the experienced crew. This is the session you've been waiting for.
After that it drops right off again.
So, patience is the game. The first week is a total bust. Your two real standouts are Monday the 24th, and the absolute best day, Tuesday the 25th of August. Get ready for that one.
Rusty.
Short Range ForecastMostly dry. Warm (max 28°C on Thu afternoon, min 19°C on Mon night). Winds decreasing (fresh winds from the NW on Tue afternoon, light winds from the N by Wed night). | Days 4-6 Weather SummaryMostly dry. Warm (max 26°C on Fri morning, min 20°C on Thu night). Mainly strong winds. | ||||||||||||||||||||
Tuesday 11 | Wednesday 12 | Thursday 13 | Friday 14 | Saturday 15 | Sunday 16 | Monday 17 | |||||||||||||||
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 7 | NW 4 | W 10 | WNW 9 | WNW 10 | WNW 9 | WNW 9 | WNW 10 | WNW 9 | WNW 9 | NW 9 | NW 6 | NW 8 | NW 8 | NW 8 | NW 9 | NW 8 | NW 8 | NW 9 | NW 9 | NW 9 |
Wave Graph  | |||||||||||||||||||||
 kJ | 10 | 43 | 50 | 90 | 123 | 115 | 118 | 123 | 126 | 94 | 281 | 112 | 214 | 266 | 277 | 210 | 153 | 101 | 152 | 152 | 179 |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | on | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | cross-on | on | cross-on | on | on | on | on | on | on | on | on | on |
High Tide | 2:24PM3.40m | 2:56AM3.21m | 3:11PM3.56m | 3:40AM3.31m | 3:55PM3.64m | 4:21AM3.33m | 4:37PM3.64m | 5:01AM3.30m | 5:17PM3.54m | 5:39AM3.20m | 5:56PM3.36m | 6:17AM3.07m | 6:35PM3.14m | ||||||||
Low Tide | 8:09AM0.87m | 8:46PM0.61m | 8:56AM0.72m | 9:31PM0.49m | 9:40AM0.62m | 10:13PM0.45m | 10:21AM0.59m | 10:53PM0.50m | 11:00AM0.63m | 11:31PM0.61m | 11:39AM0.74m | 00:08AM0.79m | 12:17PM0.91m | 00:45AM0.99m | |||||||
 | |  | | | | | | | | |  |  | | |  | | | | |  | |
 | 6:47 | — | — | 6:47 | — | — | 6:48 | — | — | 6:48 | — | — | 6:50 | — | — | 6:50 | — | — | 6:52 | — | — |
 | — | 8:36 | — | — | 8:35 | — | — | 8:34 | — | — | 8:31 | — | — | 8:30 | — | — | 8:30 | — | — | 8:29 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 5 |
Temp °C | 23 | 24 | 21 | 25 | 26 | 22 | 26 | 28 | 22 | 26 | 25 | 21 | 23 | 23 | 21 | 21 | 22 | 21 | 21 | 21 | 20 |
Feels °C | 21 | 20 | 19 | 23 | 23 | 20 | 24 | 25 | 20 | 23 | 20 | 18 | 20 | 20 | 19 | 20 | 20 | 18 | 18 | 15 | 15 |
Swell 1 Height (m) Direction Period (s) | W 6 | NNW 12 | W 10 | WNW 9 | WNW 10 | WNW 9 | WNW 9 | WNW 10 | WNW 9 | WNW 9 | S 12 | WNW 8 | S 18 | S 18 | S 17 | NW 9 | NW 8 | NW 8 | NW 9 | SW 15 | SSW 16 |
| kJ | 6 | 14 | 50 | 90 | 123 | 115 | 118 | 123 | 126 | 94 | 3 | 88 | 6 | 6 | 5 | 210 | 153 | 101 | 152 | 9 | 26 |
Swell 2 Height (m) Direction Period (s) | NW 7 | S 11 | NW 10 | NW 5 | NW 9 | NNW 9 | NW 6 | S 13 | — | S 12 | — | — | S 18 | — | S 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 11 | SW 10 |
| kJ | 7 | 2 | 17 | 13 | 3 | 8 | 15 | 3 | — | 3 | — | — | 6 | — | 5 | 10 | 10 | 8 | 8 | 5 | 4 |
Swell 3 Height (m) Direction Period (s) | WNW 10 | — | — | NNW 10 | — | — | NW 10 | — | — | — | — | — | — | — | — | — | — | SW 15 | SW 18 | SW 11 | S 13 |
| kJ | 10 | — | — | 9 | — | — | 4 | — | — | — | — | — | — | — | — | — | — | 8 | 13 | 5 | 3 |
Wind waves Height (m) Direction Period (s) | NNW 5 | NW 4 | NW 5 | — | NW 4 | NW 5 | — | NW 4 | NNW 6 | NW 6 | NW 9 | NW 6 | NW 8 | NW 8 | NW 8 | — | — | — | — | NW 9 | NW 9 |
| kJ | 10 | 43 | 38 | — | 27 | 25 | — | 24 | 59 | 31 | 281 | 112 | 214 | 266 | 277 | — | — | — | — | 152 | 179 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 193 | 459 | 14 | 14 | 27 | 20 | 20 | 159 | 27 | 62 | 612 | 175 | 175 | 623 | 82 | 154 | 159 | 288 | 161 | 598 | 189 |
Best forecast wave conditions in Lisboa | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
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Information about the Bicas Surf forecast
The above surf forecast table for Bicas provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Bicas can be found by selecting the local surf guide option on the grey menu. Our Bicas 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 (Bicas) 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 Bicas 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.
Bicas is 9 km (6 miles) from Sesimbra. If you plan a holiday in Lisboa, look for hotels and other accommodation in Sesimbra. Sesimbra has rooms for a wide range of budgets as well as car hire and transport links.
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