Surf Forecasts:
The Reef surf forecast from 31 Aug 2026:
- Best quality surf: Sunday 6 Sep, 4AM (local time) - 4.5ft (1.4m), 12s period, NW swell with cross-offshore winds.
- Most powerful swell: Tuesday 1 Sep, 1AM (local time) - 6.5ft (2.0m), 10s period, NNW swell with 772 kJ wave energy.
- Next surfable swell (1★+): Sunday 6 Sep, 4AM (local time) - 4.5ft (1.4m), 12s period with NW swell.
Best Forecast Surf Conditions for The Reef this week:
The surf forecast for The Reef over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Sep 06) at 4AM. The primary swell is predicted to be 1.4m and 12s period with a secondary swell of 0.8m and 7s. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at The Reef in the next 16 days are 2.0m 10s and forecast to arrive on Tuesday (Sep 01) 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 15s period and expected on Tuesday (Sep 01) at 10AM.
| Wave Type | Time (WEST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 4AM (Sun 6th Sep) | 4.5ft (1.4m) 12s |
| Best Surf | 4AM (Sun 6th Sep) | 4.5ft (1.4m) 12s |
| Most Powerful | 1AM (Tue 1st Sep) | 6.5ft (2.0m) 10s |
Table - best surf conditions forecast for The Reef over the next 16 days.
The Lowdown
Alright, let’s break it down. The start is a rough one, but stick with me – there’s a couple of real good ones if you wait.
Right now, The Reef is getting hammered by a fresh north wind, cross-shore, and the water’s about 68°, which is normal for this time of year. The swell is there, but the wind is ruining it. Monday the 31st through to Thursday the 3rd of September is a washout – lumpy, cross-chop, and poor surf. Not worth paddling out. The combined energy is moderate (328) but the wind is just nasty.
Friday the 4th of September morning cleans up a little with a light cross-off breeze and a clean face, but the swell is tiny at 2ft from the WNW. It’s surfable but not exciting. The energy drops to 112. If you’re really jonesing, you could get a few little ones.
Saturday the 5th of September morning has a long-period groundswell rolling in at 16 seconds from the NW, but only 2ft. The energy is moderate (310) and the wind is gentle, so it’s clean, but the size is just too small to get stoked about. The afternoon gets messy again.
Now, here’s the standout. Sunday the 6th of September morning. This is the one. The wind goes dead calm – glassy – and the swell jumps to 5ft from the NNW with a solid 12-second period. The combined energy is strong at 651. The water is clean, the waves have shape, and it’s a reef break that’s fairly consistent. This is the best session on offer. It’s a little too big for beginners, but for anyone with some experience, this is going to be a morning to remember. The afternoon swings onshore, so get it early.
After that, Monday the 7th of September morning has a clean, light offshore breeze but only 3ft from the WNW. The period is long at 14 seconds, so there’s energy, but the size is lacking. Tuesday the 8th is marginal. Wednesday the 9th of September morning is glassy again but the swell is short-period (6 seconds) and only 4ft – ordinary conditions.
The second week gets more interesting. Sunday the 13th of September morning has a light cross-off breeze and clean 4ft from the NNW. It’s not huge, but it’s rideable. Monday the 14th of September morning is glassy with 3ft from the WNW – clean, small, but fun for a longboard.
Then Tuesday the 15th of September. This is the big one. The swell hits 7ft from the NW with a 14-second period. The combined energy is massive at 1638. The wind is light and offshore from the NE. This is excellent surf, but it’s only for experienced surfers – 7ft is heavy, and The Reef is a reef break. If you’re solid, this is a serious session. The afternoon gets a bit cross-onshore, so the morning window is everything.
Crowds are likely at The Reef, especially on a Sunday or Tuesday morning with good conditions. It’s a fairly consistent spot, so it won’t be empty. The direction is NW, which is the optimum for this break, so the waves will line up nicely.
If you’re not an expert, the Sunday the 6th of September morning is your best bet – clean, glassy, 5ft, and plenty of energy. For the big dogs, Tuesday the 15th of September morning is the one to circle on the calendar. Everything else is either too small, too windy, or too messy.
Rusty.
Short Range ForecastMostly dry. Warm (max 21°C on Wed morning, min 18°C on Mon night). Mainly fresh winds. | Days 4-6 Weather SummarySome drizzle, heaviest during Sat night. Warm (max 33°C on Sat morning, min 19°C on Thu night). Wind will be generally light. | ||||||||||||||||||||
Monday 31 | Tuesday 1 | Wednesday 2 | Thursday 3 | Friday 4 | Saturday 5 | Sunday 6 | |||||||||||||||
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 9 | NW 10 | NNW 10 | NW 9 | NNW 9 | NNW 9 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 7 | NNW 6 | NNW 6 | WNW 10 | WNW 9 | NW 16 | NW 15 | NW 13 | NNW 12 | NNW 11 | NNW 10 |
Wave Graph | |||||||||||||||||||||
183 | 384 | 772 | 528 | 523 | 486 | 247 | 173 | 172 | 128 | 96 | 55 | 44 | 122 | 106 | 132 | 631 | 679 | 595 | 372 | 192 | |
Wind (km/h) | |||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross-off | cross | cross-off | cross-off | cross | cross | glassy | on | cross-off |
High Tide | 5:24PM2.94m | 5:46AM2.76m | 6:02PM2.80m | 6:25AM2.66m | 6:46PM2.61m | 7:12AM2.51m | 7:40PM2.39m | 8:13AM2.35m | 8:55PM2.19m | 9:37AM2.25m | 10:33PM2.12m | 11:12AM2.31m | 00:04AM2.23m | ||||||||
Low Tide | 11:11AM0.19m | 11:35PM0.18m | 11:48AM0.28m | 00:12AM0.31m | 12:31PM0.42m | 00:55AM0.50m | 1:22PM0.60m | 1:49AM0.71m | 2:31PM0.77m | 3:05AM0.89m | 4:07PM0.85m | 4:44AM0.93m | 5:46PM0.74m | ||||||||
7:05 | — | — | 7:05 | — | — | 7:05 | — | — | 7:07 | — | — | 7:07 | — | — | 7:09 | — | — | 7:09 | — | — | |
— | 8:09 | — | — | 8:08 | — | — | 8:07 | — | — | 8:05 | — | — | 8:04 | — | — | 8:01 | — | — | 8:00 | — | |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — |
Temp °C | 20 | 20 | 18 | 20 | 20 | 18 | 21 | 21 | 19 | 23 | 23 | 21 | 25 | 24 | 24 | 33 | 28 | 28 | 28 | 26 | 27 |
Feels °C | 16 | 16 | 14 | 16 | 16 | 14 | 19 | 19 | 17 | 22 | 21 | 20 | 22 | 21 | 21 | 28 | 24 | 25 | 28 | 25 | 25 |
Swell 1 Height (m) Direction Period (s) | NW 9 | NW 10 | SW 16 | SSW 15 | SSW 15 | SSW 14 | NW 8 | NW 8 | NNW 7 | NNW 7 | WNW 8 | WNW 8 | WNW 8 | WNW 10 | WNW 9 | NNW 6 | NW 15 | NW 13 | NNW 12 | NNW 11 | NNW 10 |
183 | 384 | 10 | 23 | 22 | 21 | 55 | 60 | 172 | 128 | 48 | 48 | 44 | 122 | 106 | 72 | 631 | 679 | 595 | 372 | 192 | |
Swell 2 Height (m) Direction Period (s) | NW 11 | SW 17 | — | — | — | — | SSW 15 | SSW 16 | SSW 15 | NW 9 | SSW 14 | SW 14 | NW 11 | SW 13 | SW 13 | WNW 9 | NNW 7 | NNW 7 | WNW 10 | W 9 | W 9 |
64 | 11 | — | — | — | — | 23 | 24 | 22 | 21 | 20 | 8 | 18 | 7 | 7 | 106 | 77 | 69 | 51 | 58 | 40 | |
Swell 3 Height (m) Direction Period (s) | W 11 | S 11 | S 10 | — | — | — | — | — | NW 10 | SSW 14 | — | — | SW 13 | SW 13 | N 12 | NW 16 | WNW 9 | WNW 9 | SW 12 | S 11 | NNW 6 |
9 | 2 | 2 | — | — | — | — | — | 4 | 20 | — | — | 7 | 7 | 3 | 132 | 96 | 46 | 5 | 3 | 6 | |
Wind waves Height (m) Direction Period (s) | NNW 5 | NNW 5 | NNW 10 | NW 9 | NNW 9 | NNW 9 | NNW 7 | NNW 7 | — | — | NNW 7 | NNW 6 | NNW 6 | NNW 6 | NNW 6 | — | — | — | — | — | — |
72 | 87 | 772 | 528 | 523 | 486 | 247 | 173 | — | — | 96 | 55 | 43 | 47 | 50 | — | — | — | — | — | — | |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 231 | 231 | 30 | 231 | 231 | 125 | 26 | 216 | 29 | 27 | 26 | 26 | 26 | 27 | 26 | 26 | 183 | 26 | 0 | 183 | 0 |
Best forecast wave conditions in Ericeira | |||||||||||||||||||||
Best forecast wave conditions in Portugal | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Information about the The Reef Surf forecast
The above surf forecast table for The Reef provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at The Reef can be found by selecting the local surf guide option on the grey menu. Our The Reef 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 (The Reef) 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 The Reef 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.
The Reef is 15 km (9 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.











