Nazare Big Wave Challenge Gets Yellow Alert, Could Run Saturday in Giant Waves
70-foot plus waves predicted for Portuguese big wave tow surfing competition.
Surf Forecasts:
Islita surfForecast / Guanacaste / Costa Rica
48hr Weather and Surf, issued 11 pm Tuesday 16 Dec 2025 CSTForecast update in hr min s Forecast update imminent
Islita surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Islita sea temperature is
28.5° C
(Which is 1.3°C warmer than normal for this time of year)How big are the waves at Islita today?
The current surf forecast for Islita at 3AM is: 0.6m 15s primary swell from a Southwest direction and 0.6m 6s secondary swell from a South-southwest direction (forecast issued at 11:00pm December 16). The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (17 Dec) | 2ft (0.6m) | 15s |
| Afternoon (17 Dec) | 1.5ft (0.4m) | 14s |
| Evening (17 Dec) | 2ft (0.6m) | 13s |
Table - waves today at Islita. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| 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 | 9 AM | 12 PM | 3 PM | 6 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |  |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 134 | 171 | 171 | 134 | 134 | 75 | 74 | 108 | 109 | 111 | 111 | 111 | 111 | 111 | 109 | 106 | 100 | 93 | 92 | 92 | 92 | 92 | 90 | 90 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | glass | cross- off | cross- off | cross- off | cross- off | on | cross- on | glass | glass | glass | off | glass | glass | cross- on | cross- on | cross- off | cross- off | off | off | off | off | glass | glass | glass |
High Tide / height (m) | 1:06PM 1.98 | 1:12AM 2.26 | 1:51PM 2.04 | 1:55AM 2.32 | 2:32PM 2.10 | |||||||||||||||||||
Low Tide / height (m) | 6:57AM 0.54 | 6:59PM 0.72 | 7:41AM 0.46 | 7:44PM 0.66 | 8:22AM 0.39 | |||||||||||||||||||
Wednesday 17 | Thursday 18 | Friday 19 | ||||||||||||||||||||||
| Sunrise | - | - | - | 5:50 | - | - | - | - | - | - | - | 5:50 | - | - | - | - | - | - | - | 5:50 | - | - | - | - |
| Sunset | - | - | - | - | - | - | 5:23 | - | - | - | - | - | - | - | 5:23 | - | - | - | - | - | - | - | 5:24 | - |
 | |  |  |  |  | | |  | | | | | | | | | | | | | | | | |
Rain (mm) | 1 | 1 | - | - | - | - | - | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 26 | 25 | 24 | 24 | 26 | 28 | 28 | 26 | 25 | 25 | 24 | 24 | 26 | 28 | 28 | 26 | 25 | 24 | 24 | 24 | 26 | 28 | 28 | 26 |
| Feels °C (?) | 30 | 29 | 27 | 27 | 29 | 31 | 31 | 30 | 29 | 29 | 27 | 27 | 29 | 31 | 31 | 29 | 28 | 27 | 27 | 27 | 28 | 31 | 31 | 29 |
- 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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