Grumari surf break

Grumari surfForecast / Rio de Janeiro / Brazil

information circle12 Day Weather and Surf, issued 8 pm Tuesday 16 Dec 2025 -03
Forecast update in hr  min  s Forecast update imminent
Grumari surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Grumari sea temperature is
26.9° C
(Which is 2.3°C warmer than normal for this time of year)


Best Forecast Surf Conditions for Grumari this week:

The surf forecast for Grumari over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Dec 18) at 3AM. The primary swell is predicted to be 1.8m and 9s period with a secondary swell of 0.4m and 12s. Another secondary swell of 1.0m and 7s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Grumari in the next 12 days are 2.3m 7s and forecast to arrive on Wednesday (Dec 17) at 9AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 2.3m 7s period and expected on Sunday (Dec 21) at 9PM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+) 3AM (Thu 18th Dec)6ft (1.8m) 9s
Best Surf 3AM (Thu 18th Dec)6ft (1.8m) 9s
Most Powerful 9AM (Wed 17th Dec)7.5ft (2.3m) 7s

Table - best surf conditions forecast for Grumari over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Moderate rain (total 17mm), heaviest on Wed morning. Warm (max 26°C on Tue night, min 20°C on Thu afternoon). Wind will be generally light.

Days 3-6 Weather Summary Mostly dry. Warm (max 30°C on Mon morning, min 22°C on Fri night). Wind will be generally light.

Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tue
23
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
1
0
0
2
1
1
2
2
0
0
1
0
1
1
0
0
1
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
0.5
SSE
2.3
SSW
1.8
SSW
1.9
S
1.4
SSW
1.4
SSW
1.3
SSW
1
SSW
0.9
SSW
0.5
SSW
0.6
SSW
0.5
SSW
1.4
E
0.4
SSW
0.6
S
0.6
S
0.5
S
0.5
S
0.4
SSW
0.3
SSW
0.2
SSW
Period(s) (?)107889910991010961312111112111010
Wave
Graph
(?)Metric surfscale
Energy kJ (?)5552944451728131530118514659724713960108936471392010
Wind
(km/h)
15
W
25
SW
15
SSW
5
SSE
5
E
5
ENE
10
NE
5
E
15
ESE
10
ENE
5
ESE
20
ESE
10
NE
5
NE
25
ESE
10
ENE
5
NNE
20
ESE
10
NE
10
NNE
20
ESE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
off
cross-
on
cross-
on
oncrosscrosscross-
off
glasscross-
on
crossglasscross-
on
cross-
off
cross-
off
cross-
on
crosscross-
off
cross-
on
cross-
off
cross-
off
cross-
on
High Tide
/ height (m)
1:21AM
1.01
1:06PM
0.92
1:59AM
1.05
1:38PM
0.95
2:34AM
1.08
2:10PM
0.98
3:06AM
1.10
2:41PM
1.01
3:39AM
1.10
3:13PM
1.04
4:11AM
1.08
3:47PM
1.06
4:46AM
1.06
4:23PM
1.07
Low Tide
/ height (m)
7:43AM
0.37
7:44PM
0.16
8:22AM
0.36
8:20PM
0.11
8:57AM
0.35
8:56PM
0.07
9:32AM
0.35
9:34PM
0.05
10:06AM
0.36
10:13PM
0.05
10:43AM
0.38
10:54PM
0.07
11:22AM
0.41
Wednesday
17
Thursday
18
Friday
19
Saturday
20
Sunday
21
Monday
22
Tue
23
Sunrise-5:03--5:03--5:03--5:03--5:05--5:05--5:05-
Sunset--6:36--6:37--6:37--6:37--6:37--6:38--6:38
mod rain
mod rain
light rain
cloud
cloud
light rain
part cloud
part cloud
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
682--1---------------
Temp. °C262222222221202424232625232827253028253230
Feels °C (?)292022222323212525252726252826253028263229
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Latest Updates

submit an eyeball surf report

Quick surf report for Grumari:

join our community of surf reporters

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 Grumari 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.


false

Information about the Grumari Surf forecast

The above surf forecast table for Grumari provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Grumari can be found by selecting the local surf guide option on the grey menu. Our Grumari 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 (Grumari) 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 Grumari 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.

Nearest locationNearest
Nearest locationNearest
Nearest locationNearest