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Cassino Surf Forecast
/ Rio Grande Do Sul (19 surf breaks) /
Surf Forecasts:
Cassino surfForecast / Rio Grande Do Sul / Brazil
16 Day Weather and Surf, issued 2 pm Sunday 17 May 2026 -03Forecast update in hr min s Forecast update imminent
Cassino surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Cassino sea temperature is
15.7° C
(Which is 2.0°C colder than average for this time of year)Best Forecast Surf Conditions for Cassino this week:
The surf forecast for Cassino over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (May 18) at 6PM. The primary swell is predicted to be 1.6m and 10s period with a secondary swell of 1.2m and 10s. Another secondary swell of 0.2m and 20s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Cassino in the next 16 days are 3.0m 14s and forecast to arrive on Thursday (May 21) at 12AM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 4s period and expected on Wednesday (May 20) at 9AM.
| Wave Type | Time (-03) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6PM (Mon 18th May) | 5ft (1.6m) 10s |
| Best Surf | 9PM (Wed 20th May) | 7ft (2.2m) 15s |
| Most Powerful | 12AM (Thu 21st May) | 10ft (3.0m) 14s |
Table - best surf conditions forecast for Cassino over the next 16 days.
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Very mild (max 15°C on Sun afternoon, min 8°C on Tue morning). Wind will be generally light. | Days 5-7 Weather SummarySome drizzle, heaviest during Fri night. Very mild (max 16°C on Fri night, min 10°C on Wed night). Wind will be generally light. | ||||||||||||||||||||
Sun 17 | Monday 18 | Tuesday 19 | Wednesday 20 | Thursday 21 | Friday 22 | Saturday 23 | |||||||||||||||
PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | |
Swell Height Map |  |  |  |  |  |  |  |  | |||||||||||||
S 4 | S 6 | S 6 | S 10 | SSE 17 | SSE 14 | SSE 13 | SSE 12 | SSE 14 | S 16 | S 14 | SSE 13 | SSE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SSE 11 | SSE 11 | SSE 10 | |
35 | 165 | 95 | 240 | 980 | 659 | 437 | 244 | 613 | 1241 | 3701 | 1377 | 1355 | 1106 | 950 | 711 | 353 | 265 | 200 | 186 | 123 | |
Wind (km/h) | |||||||||||||||||||||
cross | cross-off | cross-off | cross-off | off | off | off | off | off | cross-off | cross-off | cross-off | cross-off | cross | cross | cross-on | cross-on | on | on | on | cross-on | |
High Tide | 3:03PM0.41m | 8:18PM0.58m | 9:25AM0.29m | 3:40PM0.39m | 9:14PM0.66m | 10:15AM0.28m | 4:19PM0.35m | 10:10PM0.71m | 11:04AM0.26m | 4:59PM0.30m | 11:05PM0.72m | 11:52AM0.25m | 5:44PM0.26m | 00:00AM0.69m | 12:41PM0.25m | 6:37PM0.23m | 1:33PM0.26m | 7:49PM0.22m | |||
Low Tide | 4:50PM0.38m | 5:26AM-0.04m | 12:03PM0.18m | 6:15AM-0.10m | 12:51PM0.17m | 7:04AM-0.12m | 1:42PM0.15m | 6:40PM0.27m | 7:54AM-0.10m | 2:37PM0.14m | 7:21PM0.23m | 8:46AM-0.05m | 3:35PM0.14m | 8:04PM0.21m | 9:40AM0.02m | 4:40PM0.15m | 8:48PM0.22m | 10:41AM0.09m | |||
 |  |  | |  |  | | | | |  | | | | | |  | | | | | |
 | — | — | 7:11 | — | — | 7:13 | — | — | 7:13 | — | — | 7:13 | — | — | 7:15 | — | — | 7:15 | — | — | 7:16 |
 | 5:37 | — | — | 5:37 | — | — | 5:37 | — | — | 5:36 | — | — | 5:36 | — | — | 5:35 | — | — | 5:35 | — | 5:34 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 1 | — | — | — | — | |
Temp °C | 15 | 13 | 13 | 14 | 13 | 12 | 14 | 12 | 12 | 14 | 12 | 13 | 13 | 13 | 14 | 15 | 16 | 16 | 16 | 16 | 17 |
10 | 8 | 9 | 10 | 10 | 8 | 9 | 8 | 6 | 8 | 6 | 8 | 8 | 10 | 11 | 13 | 15 | 14 | 13 | 14 | 15 | |
Swell 1 Height (m) Direction Period (s) | SE 12 | E 7 | SE 16 | — | SSE 17 | SSE 14 | SSE 13 | SSE 12 | SSE 14 | — | SSE 14 | SSE 16 | SSE 14 | SSE 14 | SSE 13 | SSE 13 | SSE 12 | SSE 12 | SSE 11 | SSE 11 | SSE 10 |
 kJ | 6 | 1 | 10 | — | 980 | 659 | 437 | 244 | 613 | — | 1748 | 779 | 1355 | 1106 | 950 | 711 | 353 | 265 | 200 | 186 | 123 |
Swell 2 Height (m) Direction Period (s) | — | SE 12 | — | S 22 | — | — | — | E 6 | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | — | 6 | — | 9 | — | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — |
Swell 3 Height (m) Direction Period (s) | E 8 | — | — | E 7 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| kJ | 1 | — | — | 1 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Wind waves Height (m) Direction Period (s) | S 4 | S 6 | S 6 | S 10 | — | WSW 3 | — | W 3 | WSW 4 | S 16 | S 14 | SSE 13 | — | — | — | — | ESE 4 | ESE 4 | E 4 | ENE 4 | ENE 4 |
| kJ | 35 | 165 | 95 | 240 | — | 1 | — | 5 | 14 | 1241 | 3701 | 1377 | — | — | — | — | 20 | 22 | 25 | 34 | 15 |
Nearest Offshore or Glassy | |||||||||||||||||||||
Distance (km) | 293 | 235 | 210 | 235 | 9 | 9 | 236 | 9 | 235 | 293 | 336 | 530 | 235 | 235 | 235 | 515 | 235 | 336 | 382 | 210 | 224 |
Best forecast wave conditions in Rio Grande Do Sul | |||||||||||||||||||||
Best forecast wave conditions in Brazil | |||||||||||||||||||||
Header Global | |||||||||||||||||||||
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Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
FREE! Surf-Forecast.com widget for your website
The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Cassino surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.
Information about the Cassino Surf forecast
The above surf forecast table for Cassino provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Cassino can be found by selecting the local surf guide option on the grey menu. Our Cassino 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 (Cassino) 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 Cassino 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.
Cassino is 10 km (6 miles) from the city of Rio Grande. If you plan a holiday in Rio Grande Do Sul, look for hotels and other accommodation in Rio Grande. Rio Grande has rooms for a wide range of budgets as well as car hire and transport links.
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