Praia do Calhau surfForecast / Maranhao / Brazil

information circle12 Day Weather and Surf, issued 8 pm Saturday 20 Dec 2025 -03
Forecast update in hr  min  s Forecast update imminent
Praia do Calhau surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Praia do Calhau sea temperature is
28.0° C
(Which is normal for this time of year)


Best Forecast Surf Conditions for Praia do Calhau this week:

The surf forecast for Praia do Calhau over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Dec 21) at 12PM. The primary swell is predicted to be 0.9m and 10s period with a secondary swell of 0.1m and 17s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Praia do Calhau in the next 12 days are 1.1m 10s and forecast to arrive on Sunday (Dec 21) at 6AM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.1m 4s period and expected on Tuesday (Dec 23) at 9AM.

Wave TypeTime (-03) & Date Wave Height & Period
Next good surf (1 star+)12PM (Sun 21st Dec)3ft (0.9m) 10s
Best Surf12PM (Sun 21st Dec)3ft (0.9m) 10s
Most Powerful 6AM (Sun 21st Dec)3.5ft (1.1m) 10s

Table - best surf conditions forecast for Praia do Calhau over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 41mm), heaviest during Sun morning. Warm (max 27°C on Sat night, min 23°C on Sun afternoon). Wind will be generally light.

Days 3-6 Weather Summary Moderate rain (total 11mm), heaviest on Wed morning. Warm (max 28°C on Thu morning, min 24°C on Tue night). Wind will be generally light.

Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Sat
27
NightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPM
Rating
(10 max)
0
1
1
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
Wave Height (m) & direction (?)
1.1
NE
1
NE
0.8
NE
0.7
NE
0.8
NE
0.4
NE
0.4
NE
0.8
ENE
0.6
NE
0.6
NE
0.9
ENE
1.2
ENE
0.9
NE
0.8
NE
0.8
NE
0.7
NE
0.6
NE
0.6
NE
0.6
NE
1
NE
1
NE
Period(s) (?)41010999956845774664755
Wave
Graph
(?)Metric surfscale
Energy kJ (?)43192130839929303330572967675422412712424341
Wind
(km/h)
20
NE
15
ENE
10
WSW
10
E
15
NE
15
NE
10
ESE
15
SSE
10
SSE
5
WSW
10
ENE
20
NE
20
NE
20
ENE
25
NE
15
NE
15
ENE
20
NE
15
ENE
20
ENE
20
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on
crosscross-
off
crosscross-
on
cross-
on
cross-
off
cross-
off
offglasscrosscross-
on
cross-
on
cross-
on
cross-
on
cross-
on
crosscross-
on
cross-
on
crosscross-
on
High Tide
/ height (m)
8:01AM
4.82
8:10PM
5.18
8:40AM
4.83
8:49PM
5.17
9:20AM
4.82
9:32PM
5.12
10:04AM
4.79
10:18PM
5.04
10:50AM
4.75
11:09PM
4.92
11:42AM
4.72
12:06AM
4.78
12:39PM
4.70
Low Tide
/ height (m)
1:48AM
0.52
1:58PM
0.90
2:26AM
0.50
2:36PM
0.90
3:06AM
0.53
3:18PM
0.91
3:49AM
0.59
4:03PM
0.94
4:35AM
0.69
4:53PM
0.97
5:25AM
0.81
5:49PM
1.01
6:20AM
0.94
Sunday
21
Monday
22
Tuesday
23
Wednesday
24
Thursday
25
Friday
26
Sat
27
Sunrise-5:46--5:47--5:47--5:48--5:48--5:48--5:48-
Sunset--6:02--6:02--6:04--6:04--6:05--6:05--6:06
mod rain
thunderstorm
mod rain
light rain
cloud
cloud
thunderstorm
light rain
cloud
part cloud
rain showers
thunderstorm
thunderstorm
part cloud
clear
rain showers
thunderstorm
cloud
thunderstorm
thunderstorm
thunderstorm
Rain (mm)
81891--32--233--12-942
Temp. °C272523252727252426252727262828262827272728
Feels °C (?)272826282828272728282928272828283028302830
  • 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 Praia do Calhau Surf forecast

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

Praia do Calhau is 14 km (9 miles) from the city of Itaqui. If you plan a holiday in Maranhão, look for hotels and other accommodation in Itaqui. Itaqui has rooms for a wide range of budgets as well as car hire and transport links.

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