Balneario Sao Jose Surf Break

Lat Long: 24.09° S 46.60° W

Balneario Sao Jose Surf Forecast and Surf Report

Issued: 8 am 17 Aug 2026 (local time)

Forecast update in  hr  min

Today's Balneario Sao Jose sea temperature is
20.3° C
0.9° 

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


Balneario Sao Jose surf forecast from 17 Aug 2026:

  • Best quality surf: Monday 17 Aug, 9PM (local time) - 5ft (1.6m), 8s period, E swell with glassy winds.
  • Most powerful swell: Monday 24 Aug, 12PM (local time) - 6ft (1.9m), 12s period, S swell with 972 kJ wave energy.
  • Next surfable swell (1★+): Monday 17 Aug, 6PM (local time) - 4ft (1.2m), 8s period with ESE swell.

Best Forecast Surf Conditions for Balneario Sao Jose this week:

The surf forecast for Balneario Sao Jose over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 6PM. The primary swell is predicted to be 1.2m and 8s period with a secondary swell of 0.5m and 10s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Balneario Sao Jose in the next 16 days are 1.9m 12s and forecast to arrive on Monday (Aug 24) at 12PM. Winds are predicted to be onshore at the time the swell arrives.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 6PM (Mon 17th Aug)4ft (1.2m) 8s
Best Surf 9PM (Mon 17th Aug)5ft (1.6m) 8s
Most Powerful12PM (Mon 24th Aug)6ft (1.9m) 12s

Table - best surf conditions forecast for Balneario Sao Jose over the next 16 days.


The Lowdown

Alright, grab your board. I’m looking at the next couple of weeks around Balneario Sao Jose, and it’s a bit of a mixed bag but there’s some real promise brewing if you’re patient.

First thing you’ll notice – the water’s sitting at about 69°, which is just a touch warmer than usual for this time of year. Nothing crazy, but nice if you’re in a spring suit.

Okay, let’s get into the surf. The week kicks off with a bump on Monday the 17th. We’ve got a 5ft ESE swell rolling in with an 8-second period, and it’s glassy as anything with a light SSW wind. The wave energy’s moderate at 408. It’s not massive, but for a Monday morning session, it’s clean and fun. That’s your first real window.

After that, things get a bit ordinary. The swell drops off through Tuesday and Wednesday, and the winds get messy. By Thursday the 20th, we’re looking at weak 2ft waves with hardly any energy (42) – honestly, not worth paddling out for. That kind of flat spell hangs around through Friday and Saturday, with onshore winds and chop. We get a little bump of S swell on Saturday the 22nd, 5ft at 10 seconds, but the wind is onshore and the conditions are just marginal. Not the kind of day you’d drag anyone out of bed for.

The second week starts to show some life. The S swell sticks around, and by Sunday the 23rd afternoon, we’ve got 5ft at 12 seconds from the S, with moderate energy (535). The wind is light cross-onshore, so it’s a bit of a gamble, but the period is getting longer. Into Monday the 24th, the swell holds but the rain and onshore wind make it a write-off.

Then things start to get interesting. On Wednesday the 26th, the wind goes glassy again with a light SW breeze, and we’ve got a clean 3ft S swell at 11 seconds. The energy is moderate (308) and the conditions look good. That’s a sneaky-good morning session.

The real standout? Look at Monday the 31st of August. There’s a 5ft SSE groundswell rolling in with a stupidly long 16-second period. The wave energy is strong as hell at 1193. Combine that with glassy conditions and a light S wind, and you’ve got an excellent morning for experienced surfers. That’s the one to circle on the calendar. The long period will make it a bit walled at the beach, but if you can find a sandbank that’s working, you’ll be in for a treat.

The following Tuesday the 1st of September brings a bigger 8ft SSE swell at 13 seconds, with massive energy (3338), but the wind is cross-shore and conditions are marginal. That’s more for the experts, and only if the wind cooperates.

So, bottom line: Monday the 17th morning is a solid, clean start. The middle of the week is a write-off. Wednesday the 26th is a hidden gem. And Monday the 31st of August is your best bet – just make sure you’re ready for a long-period swell that’ll keep you on your toes.

Rusty.

Short Range Forecast

Mostly dry. Warm (max 28°C on Tue morning, min 18°C on Wed night). Wind will be generally light.

Days 4-6 Weather Summary

Light rain (total 4mm), mostly falling on Fri night. Warm (max 27°C on Thu afternoon, min 16°C on Fri night). Wind will be generally light.

Monday
17
Tuesday
18
Wednesday
19
Thursday
20
Friday
21
Saturday
22
Sunday
23
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
2
1
2
2
0
1
0
0
0
0
0
2
0
0
0
2
0
0
0
0
1
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.6
ESE
8
1.4
ESE
8
1.5
E
8
1.3
ESE
8
1.1
ESE
8
0.9
ESE
8
0.8
ESE
7
0.7
E
8
0.7
E
7
0.6
E
7
0.8
E
7
1.4
E
6
1
E
7
0.9
ESE
8
1.1
S
7
1.5
S
11
1.3
S
10
1
S
9
0.9
S
8
1.2
S
11
1.4
SSE
11
Wave Graph
Metric surfscale
Energy kJ
326
238
277
235
167
96
73
55
54
38
65
151
112
113
107
507
305
152
108
371
478
Wind (km/h)
5
SSW
10
SE
5
NE
5
WNW
5
ESE
5
N
10
SSW
10
SSW
10
SW
5
E
10
ENE
15
W
15
SSW
10
S
10
S
10
SSW
10
S
5
SE
10
E
10
ESE
5
E
Wind State
glassy
cross-on
cross-off
glassy
cross-on
off
cross-on
cross-on
cross
glassy
cross
cross-off
cross-on
on
cross-on
cross-on
cross-on
cross-on
cross-on
cross-on
cross
High Tide
5:00PM1.10m
5:19AM1.16m
5:24PM1.03m
5:59AM1.03m
5:50PM0.95m
6:51AM0.89m
6:25PM0.85m
8:30AM0.79m
1:28PM0.82m
7:40PM0.75m
1:16PM0.93m
00:01AM0.78m
1:25PM1.04m
00:39AM0.91m
Low Tide
10:39AM0.32m
10:29PM0.32m
10:52AM0.43m
10:54PM0.35m
11:03AM0.55m
11:23PM0.42m
11:06AM0.67m
11:57PM0.52m
10:28AM0.77m
5:16PM0.72m
5:01AM0.47m
6:21PM0.62m
6:06AM0.35m
6:57PM0.51m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
cloud
part cloud
rain showers
rain showers
part cloud
part cloud
part cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:31
6:30
6:28
6:28
6:28
6:26
6:26
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:49
5:50
5:50
5:51
5:51
5:51
5:52
 mm
2
2
1
Temp °C
24
24
22
28
28
26
26
24
20
26
27
25
23
21
18
18
18
17
18
19
17
Feels °C
26
26
24
30
29
27
26
26
22
26
28
25
23
20
18
17
17
17
17
18
16
  • 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 Balneario Sao Jose Surf forecast

The above surf forecast table for Balneario Sao Jose provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Balneario Sao Jose can be found by selecting the local surf guide option on the grey menu. Our Balneario Sao Jose 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 (Balneario Sao Jose) 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 Balneario Sao Jose 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.

Balneario Sao Jose is 3 km (2 miles) from the city of Mongagua. If you plan a holiday in São Paulo, look for hotels and other accommodation in Mongagua. Mongagua has rooms for a wide range of budgets as well as car hire and transport links.

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