Cassino Surf Break

Lat Long: 32.21° S 52.19° W

Cassino Surf Forecast and Surf Report

Issued: 8 pm 16 Aug 2026 (local time)

Forecast update in  hr  min

Today's Cassino sea temperature is
14.1° C
0.5° 

Cassino surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Cassino surf forecast from 17 Aug 2026:

  • Best quality surf: Sunday 23 Aug, 9PM (local time) - 7ft (2.2m), 11s period, S swell with cross-offshore winds.
  • Most powerful swell: Monday 24 Aug, 12AM (local time) - 7ft (2.1m), 12s period, S swell with 1,334 kJ wave energy.
  • Next surfable swell (1★+): Monday 17 Aug, 6AM (local time) - 4ft (1.2m), 9s period with E swell.

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 (Aug 17) at 6AM. The primary swell is predicted to be 1.2m and 9s period with a secondary swell of 0.2m and 9s. 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 2.1m 12s and forecast to arrive on Monday (Aug 24) 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 1.6m 5s period and expected on Friday (Aug 21) at 3AM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 6AM (Mon 17th Aug)4ft (1.2m) 9s
Best Surf 9PM (Sun 23rd Aug)7ft (2.2m) 11s
Most Powerful12AM (Mon 24th Aug)7ft (2.1m) 12s

Table - best surf conditions forecast for Cassino over the next 16 days.


The Lowdown

Alright, Rusty here again, but now in feet and miles. Let’s break down Cassino.

Monday morning 17 August starts with a tease. Clean 4ft easterly swell rolls in with combined energy at 212 (moderate). Glassy conditions – winds nearly calm out of the WNW. That’s sweet for a beginner spot like this beach/jetty. But by afternoon the wind swings onshore from the east and it’s game over.

Tuesday 18 August is a mess – morning is ordinary, afternoon is worse with cross-shore winds. Wednesday and Thursday are total losses – cross-onshore breezes, short weak swell, energy dropping to almost nothing (98) by Thursday morning.

From Thursday afternoon all the way to Friday 28 August, it’s a dry spell. Some afternoons are clean, but the swell is tiny or poorly shaped. Saturday 22 August shows a bump to 4ft from the SSE with moderate energy (252), but it’s marginal at best.

Sunday 23 August morning is the first real bright spot. A clean 5ft southerly groundswell with 11-second period. Offshore WSW winds at 15 mph. Combined energy hits 598 (moderate to strong). Still only rated marginal, but it’s the cleanest pulse in the first ten days. Keep in mind this is a beach setup – that longer period can make waves a little fat and straight.

Monday 24 August keeps the energy up: 5ft SSE swell, 12-second period, energy 636, clean morning. Again marginal, but for experienced surfers it’s worth a look. Beginners should sit this one out – over 5ft is too much.

Then Friday 28 August morning is the real standout of the whole outlook. Swell hits 6ft from the ESE – short period at 7 seconds, but combined energy is 358 (moderate). Light SSW winds at 9 mph, cross-off, keep the surface glassy. Forecast calls it “expect good surf conditions.” This is the one to save for, but it’s over a week away, so watch the updates.

Saturday 29 August and Sunday 30 August slide back into onshore junk. Monday 31 August brings another pulse: 5ft SSE, 12-second period, energy 671 (strong), but cross-shore winds mess up the surface.

Finally, Tuesday 1 September morning closes on a high note: 4ft ESE swell, 11-second period, energy 450 (moderate). Offshore WNW winds at just 6 mph. Clean, glassy. A solid way to finish.

The standout is Friday 28 August morning. Tuesday 1 September morning is the backup. For kite fans, those afternoons with 15-20 mph cross-onshore winds and lumpy seas might be more fun than paddling.

First week is lean – small swell, weak energy, onshore winds. Second week picks up with a couple of clean, solid mornings. Keep the wax handy for the end of August and that first day of September.

Rusty.

Short Range Forecast

Heavy rain (total 29mm), heaviest during Mon morning. Very mild (max 18°C on Mon afternoon, min 12°C on Tue night). Wind will be generally light.

Days 5-7 Weather Summary

Moderate rain (total 13mm), heaviest on Thu morning. Very mild (max 18°C on Thu afternoon, min 7°C on Fri night). Winds decreasing (fresh winds from the SW on Thu night, light winds from the S by Fri night).

Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
2
0
0
1
0
0
0
0
0
0
0
0
0
0
2
1
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.4
E
9
1.1
E
9
1
E
9
0.9
E
9
0.7
E
9
0.7
E
9
1.1
SE
6
1.2
ESE
5
1
ESE
5
1.1
E
5
1.2
E
5
0.8
E
7
0.6
E
8
0.9
S
7
0.9
SSE
8
1.6
S
7
1.3
SSE
8
1.3
SSE
9
1.4
S
10
Wave Graph
Metric surfscale
Energy kJ
318
205
166
134
78
74
101
80
60
59
82
58
40
87
115
275
246
295
432
Wind (km/h)
15
NNE
0
WNW
10
E
10
SE
15
SW
20
S
15
ESE
25
SE
15
SE
15
E
15
NE
30
NW
30
WNW
30
WSW
25
SW
15
SW
25
SW
25
WSW
20
W
Wind State
cross
glassy
on
cross-on
cross-off
cross
cross-on
cross-on
cross-on
on
cross-on
cross-off
off
cross-off
cross-off
cross-off
cross-off
cross-off
off
High Tide
11:30PM0.48m
3:43AM0.39m
4:07PM0.28m
00:26AM0.43m
4:22AM0.35m
12:38PM0.44m
1:20AM0.38m
1:24PM0.47m
2:12AM0.34m
7:24AM0.26m
2:07PM0.48m
3:01AM0.30m
2:48PM0.47m
9:39PM0.17m
3:49AM0.26m
3:27PM0.45m
11:11PM0.22m
Low Tide
2:26AM0.38m
7:55AM0.07m
2:59PM0.27m
8:06PM0.04m
3:29AM0.35m
8:53PM0.04m
9:04AM0.18m
9:39PM0.07m
5:48AM0.25m
10:28PM0.11m
6:25AM0.21m
8:35PM0.17m
7:02AM0.17m
8:30PM0.16m
mod rain
mod rain
light rain
light rain
cloud
cloud
light rain
light rain
light rain
light rain
mod rain
part cloud
light rain
part cloud
part cloud
cloud
clear
part cloud
clear
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
7:03
7:01
7:01
7:00
6:58
6:58
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:00
6:01
6:02
6:02
6:04
6:05
6:05
 mm
7
6
1
3
4
3
5
2
10
1
Temp °C
17
17
18
17
16
14
13
12
13
16
17
18
13
11
12
11
9
11
10
Feels °C
15
19
19
18
16
12
11
8
11
16
16
14
7
6
7
8
3
6
5
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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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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