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Surf Forecasts:

Avellanas Rivermouth surfForecast / Guanacaste / Costa Rica

information circle12 Day Weather and Surf, issued 5 am Tuesday 26 Aug 2025 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
29.0° C
 (Which is slightly warmer than usual)

Best Forecast Surf Conditions for Avellanas Rivermouth this week:

The surf forecast for Avellanas Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Aug 27) at 3PM. The primary swell is predicted to be 1.4m and 12s period with a secondary swell of 0.5m and 16s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Avellanas Rivermouth in the next 12 days are 1.9m 15s and forecast to arrive on Tuesday (Aug 26) at 12PM. Winds are predicted to be onshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.6m 5s period and expected on Tuesday (Aug 26) at 12PM.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+) 3PM (Wed 27th Aug)4.5ft (1.4m) 12s
Best Surf 3PM (Wed 27th Aug)4.5ft (1.4m) 12s
Most Powerful12PM (Tue 26th Aug)6ft (1.9m) 15s

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 Heavy rain (total 39mm), heaviest during Wed night. Warm (max 31°C on Tue morning, min 24°C on Wed night). Wind will be generally light.

Days 3-6 Weather Summary Heavy rain (total 37mm), heaviest during Fri morning. Warm (max 28°C on Sat morning, min 24°C on Fri afternoon). Wind will be generally light.

Tuesday
26
Wednesday
27
Thursday
28
Friday
29
Saturday
30
Sunday
31
Monday
01
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
0
2
2
2
3
3
1
1
0
1
1
3
3
3
3
2
3
2
2
2
2
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
1.9
SSW
1.9
S
1.8
S
1.5
S
1.4
S
1.3
S
1.1
S
1.1
S
1.1
S
0.5
SW
0.5
SW
0.8
SW
0.9
SW
1.2
SW
1.2
SW
1.2
SW
1.1
SW
1.1
SW
1.1
SW
1.1
SW
1.1
SW
Period(s) (?)151414141213111111151619181716161515151615
Wave
Graph
(?)Metric surfscale
Energy (?)1943152613961067725636471410467298283634752974857963841653650666620
Wind
(km/h)
30
ENE
15
ESE
10
ENE
15
ENE
10
SW
5
N
10
NE
10
ESE
15
ESE
5
S
10
SSE
5
ESE
5
ESE
10
SW
5
ENE
10
N
10
WNW
10
ESE
10
ENE
10
SE
10
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
on		cross-
on		cross-
on		cross-
off		glasscross-
on		oncross-
on		crosscross-
on		glassglasscross-
off		glasscrossoffononcross-
on		on
High Tide
/ height (m)
4:46PM
2.33
5:07AM
2.44
5:23PM
2.24
5:42AM
2.37
6:01PM
2.13
6:19AM
2.27
6:39PM
2.00
6:58AM
2.16
7:21PM
1.87
7:41AM
2.04
8:10PM
1.74
8:32AM
1.95
9:10PM
1.66
Low Tide
/ height (m)
10:42AM
0.28
10:53PM
0.26
11:20AM
0.32
11:28PM
0.34
11:58AM
0.39
12:04AM
0.45
12:37PM
0.48
12:40AM
0.56
1:19PM
0.59
1:20AM
0.68
2:07PM
0.69
2:06AM
0.79
3:05PM
0.76
Tuesday
26
Wednesday
27
Thursday
28
Friday
29
Saturday
30
Sunday
31
Monday
01
Sunrise5:33--5:33--5:33--5:33--5:33--5:33--5:33--
Sunset-5:55--5:54--5:54--5:53--5:52--5:52--5:52-
part cloud
part cloud
part cloud
part cloud
thunderstorm
thunderstorm
thunderstorm
mod rain
rain showers
thunderstorm
mod rain
light rain
part cloud
thunderstorm
thunderstorm
part cloud
mod rain
thunderstorm
rain showers
thunderstorm
thunderstorm
Rain (mm)
----5144106961-25-862164
Temp. °C313027302825282726272424282726282826292725
Feels °C (?)323230343130323129312827323031313130333128
  • 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

Eyeball surf reportRecent Eyeball Surf Reports for Guanacaste

  1. weather stationWind Update Continuing clean conditions at Avellanas Rivermouth (light winds from the ENE at Liberia/Tomas Guardia Airport 51 km from Avellanas Rivermouth). 1.2m 15s groundswell from the SSW with a 1.1m 11s groundswell from the S and a 0.5m 17s long period groundswell from the SW. 3 swells combining to make bigger set waves.

    1 hour 58 minutes ago Avellanas Rivermouth
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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 Avellanas Rivermouth 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.

View detailed surf forecast for Avellanas Rivermouth at:
surf-forecast.com

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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