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Avellanas Rivermouth Surf Forecast
/ Guanacaste (28 surf breaks) /
Surf Forecasts:
Avellanas Rivermouth surfForecast / Guanacaste / Costa Rica
48hr Weather and Surf, issued 11 am Wednesday 01 Oct 2025 CST
How big are the waves at Avellanas Rivermouth today?
The current surf forecast for Avellanas Rivermouth at 4PM is: 0.7m 12s primary swell from a South-southwest direction and 0.6m 6s secondary swell from a South-southwest direction (forecast issued at 11:00am October 01). The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (01 Oct) | 3.5ft (1.0m) | 10s |
| Afternoon (01 Oct) | 2.5ft (0.7m) | 12s |
| Evening (01 Oct) | 3ft (0.9m) | 10s |
Table - waves today at Avellanas Rivermouth. (Swell directed towards the surf break)
Wednesday 01 | Thursday 02 | Friday 03 | Saturday 04 | |||||||||||||||||||||
| 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 0 AM | 3 AM | 6 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 10 | 10 | 12 | 10 | 10 | 10 | 10 | 9 | 14 | 14 | 14 | 14 | 14 | 14 | 13 | 13 | 7 | 13 | 16 | 16 | 13 | 19 | 18 | 15 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 216 | 202 | 131 | 127 | 157 | 125 | 123 | 110 | 132 | 154 | 115 | 103 | 102 | 114 | 117 | 117 | 140 | 85 | 126 | 196 | 87 | 180 | 178 | 275 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- on | off | cross- off | cross- off | glass | glass | glass | glass | glass | glass | off | glass | glass | glass | glass | glass | glass | cross- off | cross- off | cross- off | glass | glass | glass | glass |
High Tide / height (m) | 8:50AM 1.87 | 9:42PM 1.70 | 10:00AM 1.86 | 10:51PM 1.80 | 11:09AM 1.93 | 11:50PM 1.98 | ||||||||||||||||||
Low Tide / height (m) | 3:24PM 0.78 | 3:41AM 0.90 | 4:31PM 0.75 | 4:55AM 0.83 | 5:31PM 0.66 | 5:59AM 0.68 | ||||||||||||||||||
Wednesday 01 | Thursday 02 | Friday 03 | Saturday 04 | |||||||||||||||||||||
| Sunrise | 5:31 | - | - | - | - | - | - | 5:31 | - | - | - | - | - | - | - | 5:31 | - | - | - | - | - | - | - | 5:31 |
| Sunset | - | - | 5:34 | - | - | - | - | - | - | - | 5:32 | - | - | - | - | - | - | - | 5:31 | - | - | - | - | - |
 |  | |  | | |  |  | | | |  | | | | | | | | | | | | | |
Rain (mm) | - | 1 | 3 | 2 | 3 | 1 | - | - | - | - | 1 | - | - | - | - | - | - | 1 | 1 | 1 | 1 | 3 | - | - |
| Temp. °C | 27 | 28 | 27 | 27 | 27 | 26 | 26 | 25 | 26 | 28 | 27 | 27 | 26 | 26 | 25 | 25 | 27 | 28 | 28 | 26 | 26 | 25 | 25 | 24 |
| Feels °C (?) | 31 | 32 | 31 | 31 | 31 | 30 | 30 | 29 | 30 | 33 | 31 | 32 | 31 | 31 | 29 | 29 | 32 | 32 | 31 | 30 | 30 | 29 | 29 | 27 |
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Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
Recent Eyeball Surf Reports for Guanacaste
The wind is still offshore at Avellanas Rivermouth (light winds from the W.(Wind varies from 250 to 320 degs) at Liberia/Tomas Guardia Airport 51 km from Avellanas Rivermouth). 0.9m 10s swell from the SSW with a 0.6m 12s groundswell, also from the SSW and a 0.3m 9s swell, also from the W. 3 swells combining to make bigger set waves.
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