Beach forecast for São João da Barra
Today, Thursday, October 29, 2026 · local time (GMT-3) · Río de Janeiro, Brazil Today, Thu, Oct 29 · GMT-3- Swimming
- Use care · 3.1 ft
- Water
- 77 °F · warm
- Max UV
- 5 · SPF 30
- Wind
- 12 mph
Today, Thursday, October 29, it's a fair beach day in São João da Barra (5/10). The best hours are from 9:00 am to 2:00 pm: beach weather, little wind and water at 77 °F, though with clouds and some waves. The best day this week is Sunday, November 1, at 7/10.
Beach forecast for the next 7 days
| Day | Rating | Best hours | Swimming | Water | UV |
|---|---|---|---|---|---|
| Today | 5Fair beach day | 9:00 am–2:00 pm | Use care · 3.1 ft | 77 °F | 5 |
| Fri 30 | 1Not a beach day | No good window | Use care · 3.8 ft | 77 °F | 5 |
| Sat 31 | 5Fair beach day | 7:00–11:00 am | Use care · 2.8 ft | 78 °F | 12 |
| Sun 1 | 7Good beach day | 7:00 am–12:00 pm3:00–5:00 pm | Calm · 2.4 ft | 78 °F | 9 |
| Mon 2 | 6Fair beach day | 3:00–5:00 pm6:00–9:00 am | Calm · 2.4 ft | 79 °F | 4 |
| Tue 3 | 5Fair beach day | 7:00 am–12:00 pm | Use care · 3.3 ft | 79 °F | — |
| Wed 4 | 7Good beach day | 6:00–11:00 am | Use care · 3.3 ft | 80 °F | — |
Each rating comes from sun, temperature, rain, wind, waves, UV, water temperature and, where there is one, the tide.
Today in detail
- Feels like 83 °F: beach weather
- Onshore breeze (11 mph)
- UV 5 (moderate): SPF 30 sunscreen
- Water at 77 °F (warm)
- Cloudy (96% cloud cover)
- Swim with care: 3.1 ft waves every 7 s
Today, hour by hour
- Swimming Use care · 3.1 ft
3.1 ft waves every 7 s: swim with care and stay where you can stand. Low rip current risk. Always follow the lifeguard's flags.
- Water 77 °F
Warm: very pleasant.
- Sun & sunscreen UV 5 · SPF 30
Max UV 5 (moderate): SPF 30 sunscreen, reapplied every 2 hours.
- Wind 12 mph
Onshore breeze (12 mph).
- Tide & sand
We don't show the tide for São João da Barra, so it doesn't count in the rating.
The best window, 9:00 am to 2:00 pm, brings beach weather, little wind and water at 77 °F, though with clouds and some waves.
We don't have data on jellyfish, sargassum or beach closures: ask the lifeguard or check with the local beach authority.
Today, hour by hour
| Time | Rating | Sky | Feels like | Wind | Waves | UV |
|---|---|---|---|---|---|---|
| 6:00 am | 2 | Overcast | 75 °F | 6 mph | 3.1 ft | 0 |
| 7:00 am | 3 | Overcast | 77 °F | 6 mph | 3.1 ft | 1 |
| 8:00 am | 3 | Overcast | 80 °F | 8 mph | 3.1 ft | 3 |
| 9:00 am | 5 | Overcast | 82 °F | 8 mph | 3.0 ft | 5 |
| 10:00 am | 5 | Overcast | 83 °F | 9 mph | 3.0 ft | 4 |
| 11:00 am | 5 | Overcast | 82 °F | 9 mph | 3.0 ft | 4 |
| 12:00 pm | 5 | Overcast | 82 °F | 10 mph | 3.0 ft | 4 |
| 1:00 pm | 5 | Overcast | 82 °F | 11 mph | 3.1 ft | 4 |
| 2:00 pm | 5 | Overcast | 82 °F | 11 mph | 3.2 ft | 3 |
| 3:00 pm | 3 | Overcast | 80 °F | 12 mph | 3.3 ft | 2 |
| 4:00 pm | 3 | Overcast | 79 °F | 11 mph | 3.4 ft | 1 |
Beach hours only: from one hour after sunrise to half an hour before sunset.
Beaches near São João da Barra
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Praia de Atafona 2.3 mi · SE
- Restrooms
- Praia de Grussaí 3.7 mi · SE
- Praia de Gargaú 5.5 mi · N
- Praia Nossa Senhora de Fátima 6.2 mi · N
Named beaches within 6.2 mi, nearest first. Amenities from OpenStreetMap: some may be missing or out of date. View on OpenStreetMap · Add or fix on OpenStreetMap
Beaches and amenities: © OpenStreetMap contributors (ODbL).
Webcams near São João da Barra
Webcams provided by windy.com — add a webcam
How we rate a beach day
We rate every beach hour from 0 to 10 with simple, fixed rules:
- Adds: sunshine (up to 3 points, fewer with more clouds), warmth (up to 4, from the feels-like temperature; ideal between 81 °F and 91 °F), a calm sea (1), water at 70 °F or warmer (1; from 64 °F, half) and low or mid tide (1: more sand). Anything without data is left out and the rest is scaled to 10.
- Takes away: cold (feels-like below 64 °F, 1 to 4 points), rain (half a point if likely, up to 6 if it rains; thunderstorms, 8), wind from force 4, about 12 mph (1 to 6 points; half a point more if offshore, which blows inflatables out to sea, or onshore, which churns the water), waves (1 to swim with care, 4 if dangerous, 1 more for high rip current risk), very high UV (half a point; extreme, 1), water below 59 °F (1) and spring high tides (1: little sand left).
- Swimming: calm, use care (waves from 2.6 ft, or long swell) or dangerous (from 6.6 ft, or 4.9 ft with a long period), based on how much of the wave reaches this shore given the way it faces. In the U.S., today's and tomorrow's rip current risk comes from the National Weather Service surf zone forecast when it issues one; otherwise we estimate it from the waves.
- Best windows: runs of 2 to 5 hours rated 4 or more and close to the best hour, at least one hour apart.
- Day rating: the average of the best window; a 2-hour window keeps 85% of it and a 3-hour window 95%.
Today, in the best window: sun 0 of 3, warmth 4 of 4, calm sea 0 of 1 and water 1 of 1; minus waves 1.
It's a guide, not a guarantee: weather changes and every beach is different. Always follow the lifeguard's flags.
Questions about the beach in São João da Barra
Is it a beach day in São João da Barra today?
A fair beach day: 5/10. Best from 9:00 am to 2:00 pm, with beach weather, little wind and water at 77 °F, though with clouds and some waves.
What are the swimming conditions in São João da Barra today?
3.1 ft waves every 7 s: swim with care and stay where you can stand. Low rip current risk. Always follow the lifeguard's flags.
How warm is the water in São João da Barra?
About 77 °F today: warm. That's the sea surface temperature offshore; it can differ a little at the shoreline.
How much sun protection do I need in São João da Barra today?
UV reaches 5 (moderate): SPF 30 sunscreen, sunglasses and a hat.
What about tomorrow? Will it be a beach day in São João da Barra?
Tomorrow, Friday, October 30: not a beach day (1/10).
What beaches are near São João da Barra?
Praia de Atafona (2.3 mi), Praia de Grussaí (3.7 mi), Praia de Gargaú (5.5 mi) and Praia Nossa Senhora de Fátima (6.2 mi). See below for amenities and water quality.
Are there jellyfish or sargassum today?
We don't know: there's no open data on jellyfish, sargassum or closures for each beach. Ask the lifeguard, check the flags or the local beach authority's website.
How is the rating worked out?
From the hourly forecast: sun and clouds, feels-like temperature, rain, wind (and whether it blows onshore or offshore), waves and their period, UV, water temperature and, where there is one, the tide. Each factor adds or takes away a fixed number of points and the rating sums them up out of 10.
More about São João da Barra today
Learn more
Our own calculation, using the Open-Meteo forecast (ECMWF, NOAA GFS, Météo-France, Copernicus Marine and CAMS, CC BY 4.0) and the sun from astronomy-engine.