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Surf Forecasts:

Avellanas Rivermouth surfForecast / Guanacaste / Costa Rica

information circle12 Day Weather and Surf, issued 5 am Saturday 31 Jan 2026 CST
Forecast update in hr  min  s Forecast update imminent
Avellanas Rivermouth surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Avellanas Rivermouth sea temperature is
28.2° C
 (Which is 1.4°C warmer than normal for this time of year)

Best Forecast Surf Conditions for Avellanas Rivermouth this week:

The most powerful waves expected at Avellanas Rivermouth in the next 12 days are 0.7m 14s and forecast to arrive on Sunday (Feb 01) at 9PM. Winds are predicted to be cross-onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.7m 6s period and expected on Monday (Feb 02) at 6AM.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+)--
Best Surf--
Most Powerful 9PM (Sun 1st Feb)2.5ft (0.7m) 14s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Mostly dry. Warm (max 31°C on Sat afternoon, min 20°C on Sun night). Winds increasing (light winds from the NE on Sat morning, strong winds from the NE by Sun morning).

Days 3-6 Weather Summary Mostly dry. Warm (max 31°C on Thu afternoon, min 22°C on Tue night). Mainly fresh winds.

Saturday
31
Sunday
01
Monday
02
Tuesday
03
Wednesday
04
Thursday
05
Friday
06
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.6
SSW
0.6
SSW
0.6
SSW
0.6
S
1.4
NNE
1.4
NNE
1.7
NNE
0.7
SSW
1.6
NE
1.6
NNE
1.1
NNE
0.5
S
1
NNE
0.5
S
0.3
WNW
0.4
WNW
0.4
WNW
0.5
WNW
1.6
NNE
1.3
NNE
0.4
WNW
Period(s) (?)131313146661366612613191718166615
Wave
Graph
(?)Metric surfscale
Energy kJ (?)116126133134139114210181165173927260827111112115315410487
Wind
(km/h)
15
NE
25
NE
40
ENE
35
NE
40
NE
30
ENE
30
NE
35
ENE
25
NE
35
ENE
30
ENE
25
ENE
25
ENE
30
NE
20
NE
30
NE
30
NE
25
NE
30
ENE
30
ENE
30
NE
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		oncross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		ononcross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on		cross-
on
High Tide
/ height (m)
1:26PM
2.14
1:44AM
2.44
2:23PM
2.30
2:38AM
2.51
3:13PM
2.43
3:27AM
2.54
3:59PM
2.53
4:12AM
2.53
4:42PM
2.56
4:55AM
2.47
5:22PM
2.54
5:37AM
2.36
6:02PM
2.47
Low Tide
/ height (m)
7:27PM
0.40
8:09AM
0.17
8:25PM
0.30
8:58AM
0.08
9:17PM
0.23
9:43AM
0.04
10:05PM
0.19
10:26AM
0.05
10:51PM
0.20
11:07AM
0.11
11:34PM
0.25
11:46AM
0.21
12:16AM
0.34
Saturday
31
Sunday
01
Monday
02
Tuesday
03
Wednesday
04
Thursday
05
Friday
06
Sunrise6:05--6:05--6:05--6:05--6:05--6:05--6:05--
Sunset-5:46--5:46--5:47--5:47--5:47--5:49--5:49-
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
Rain (mm)
---------------------
Temp. °C293126292925272823282924303024303126303126
Feels °C (?)292924232321222217242520282823272825272822
  • Map Icons:
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  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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View detailed surf forecast for Avellanas Rivermouth at:
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Information about the Avellanas Rivermouth Surf forecast

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

Avellanas Rivermouth is 44 km (27 miles) from Nicoya. If you plan a holiday in Guanacaste, look for hotels and other accommodation in Nicoya. Nicoya has rooms for a wide range of budgets as well as car hire and transport links.

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