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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 5 am Saturday 16 May 2026 CSTForecast 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
30.4° C
(Which is 1.6°C warmer than normal for this time of year)How big are the waves at Avellanas Rivermouth today?
The current surf forecast for Avellanas Rivermouth at 10AM is: 0.9m 13s primary swell from a South-southwest direction and 0.5m 9s secondary swell from a South direction, 0.3m 4s secondary swell from a North-northeast direction (forecast issued at 05:00am May 16). The wind direction is predicted to be cross-onshore.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 May) | 3ft (0.9m) | 13s |
| Afternoon (16 May) | 3ft (0.9m) | 13s |
| Evening (16 May) | 3ft (0.9m) | 13s |
Table - waves today at Avellanas Rivermouth. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Short Range ForecastMostly dry. Warm (max 33°C on Sat morning, min 27°C on Sat night). Wind will be generally light. | ||||||||||||||||||||||||
Saturday 16 | Sunday 17 | Monday 18 | Tue 19 | |||||||||||||||||||||
3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | 3 AM | 6 AM | 9 AM | 12 PM | 3 PM | 6 PM | 9 PM | 12 AM | |
Swell Height Map |    |    |    |    | ||||||||||||||||||||
SW 14 | SW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 14 | SSW 14 | SW 14 | SSW 14 | SSW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 17 | |
357 | 352 | 309 | 309 | 304 | 304 | 253 | 253 | 253 | 261 | 288 | 253 | 288 | 243 | 225 | 178 | 175 | 175 | 175 | 178 | 178 | 178 | 178 | 243 | |
Wind (km/h) | ||||||||||||||||||||||||
on | cross-on | cross-on | cross-off | cross-off | cross-on | on | on | on | on | cross-on | on | cross-off | on | on | on | on | on | on | glassy | cross-off | cross-off | glassy | on | |
High Tide | 1:44AM2.24m | 2:00PM2.66m | 2:35AM2.34m | 2:50PM2.73m | 3:25AM2.42m | 3:41PM2.74m | ||||||||||||||||||
Low Tide | 7:42AM0.28m | 8:26PM0.04m | 8:33AM0.18m | 9:15PM-0.05m | 9:25AM0.13m | 10:04PM-0.08m | ||||||||||||||||||
 |  | |  | |  | | | | | | | | | | | |  | | | | | | | |
 | 5:20 | — | — | — | — | — | — | — | 5:20 | — | — | — | — | — | — | — | 5:20 | — | — | — | — | — | — | 5:20 |
 | — | — | — | — | 5:57 | — | — | — | — | — | — | — | 5:57 | — | — | — | — | — | — | — | 5:58 | — | — | 5:58 |
— | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | |
Temp °C | 27 | 27 | 31 | 33 | 30 | 30 | 29 | 28 | 27 | 27 | 31 | 33 | 31 | 31 | 29 | 28 | 27 | 27 | 31 | 33 | 30 | 29 | 29 | 28 |
29 | 30 | 32 | 36 | 32 | 33 | 30 | 29 | 28 | 28 | 31 | 36 | 33 | 33 | 29 | 28 | 28 | 29 | 32 | 37 | 32 | 32 | 33 | 31 | |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 14 | SSW 14 | SW 14 | SSW 14 | SSW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SW 13 | SSW 13 |
 kJ | 357 | 352 | 309 | 309 | 304 | 304 | 253 | 253 | 253 | 261 | 288 | 253 | 288 | 243 | 225 | 178 | 175 | 175 | 175 | 178 | 178 | 178 | 178 | 114 |
Swell 2 Height (m) Direction Period (s) | S 9 | SSE 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 9 | S 8 | NNW 5 | S 8 | S 7 | S 7 | S 6 | S 6 | S 8 | S 8 | S 8 | S 8 | S 7 | SW 17 |
| kJ | 45 | 48 | 42 | 41 | 40 | 40 | 25 | 25 | 25 | 25 | 24 | 35 | 7 | 34 | 24 | 23 | 20 | 12 | 31 | 30 | 28 | 40 | 38 | 243 |
Swell 3 Height (m) Direction Period (s) | NNW 8 | W 12 | NW 8 | NW 12 | NNW 4 | N 4 | SW 20 | SW 20 | SW 20 | SSW 20 | SSW 19 | N 5 | S 8 | N 5 | SW 18 | SW 18 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 18 | S 7 |
| kJ | 7 | 3 | 2 | 6 | 6 | 6 | 15 | 15 | 15 | 37 | 37 | 7 | 23 | 4 | 81 | 81 | 82 | 83 | 77 | 69 | 69 | 132 | 150 | 36 |
Wind waves Height (m) Direction Period (s) | — | N 8 | NNE 4 | N 4 | — | — | NNE 4 | NNE 4 | NNE 4 | NNE 4 | NNE 5 | — | — | — | — | NE 3 | NE 3 | NE 3 | NE 3 | — | — | — | — | NNE 4 |
| kJ | — | 11 | 4 | 6 | — | — | 6 | 11 | 7 | 8 | 7 | — | — | — | — | 5 | 3 | 2 | 1 | — | — | — | — | 2 |
Nearest Offshore or Glassy | ||||||||||||||||||||||||
Distance (km) | 1 | 1 | 10 | 0 | 64 | 1 | 1 | 1 | 1 | 1 | 19 | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 1 |
Best forecast wave conditions in Guanacaste | ||||||||||||||||||||||||
Best forecast wave conditions in Costa Rica | ||||||||||||||||||||||||
Header Global | ||||||||||||||||||||||||
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