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 5 pm Wednesday 10 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 1AM is: 0.7m 13s primary swell from a South-southwest direction and 0.4m 6s secondary swell from a South-southwest direction (forecast issued at 05:00pm December 10). The wind direction is predicted to be cross-offshore and the swell rating is 2.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (11 Dec) | 2.5ft (0.7m) | 12s |
| Afternoon (11 Dec) | 2ft (0.6m) | 12s |
| Evening (11 Dec) | 2ft (0.6m) | 12s |
Table - waves today at Islita. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| 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 | 9 AM | 12 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 14 | 13 | 13 | 13 | 13 | 13 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 11 | 7 | 7 | 7 | 7 | 12 | 7 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 198 | 184 | 178 | 176 | 173 | 168 | 160 | 119 | 117 | 115 | 113 | 113 | 111 | 109 | 77 | 67 | 66 | 65 | 64 | 60 | 74 | 75 | 58 | 57 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | on | glass | glass | cross- off | cross- off | off | cross- off | on | on | glass | glass | off | off | cross- off | glass | glass | cross- on | glass | glass | glass | off | off | off | glass |
High Tide / height (m) | 7:06PM 2.44 | 7:21AM 2.26 | 8:01PM 2.35 | 8:18AM 2.11 | 8:56PM 2.27 | 9:19AM 1.99 | ||||||||||||||||||
Low Tide / height (m) | 12:45PM 0.23 | 1:18AM 0.51 | 1:37PM 0.40 | 2:17AM 0.62 | 2:31PM 0.55 | 3:19AM 0.68 | ||||||||||||||||||
Wednesday 10 | Thursday 11 | Friday 12 | Saturday 13 | |||||||||||||||||||||
| Sunrise | - | - | - | - | - | 5:47 | - | - | - | - | - | - | - | 5:48 | - | - | - | - | - | - | - | 5:48 | - | - |
| Sunset | 5:21 | - | - | - | - | - | - | - | 5:21 | - | - | - | - | - | - | - | 5:21 | - | - | - | - | - | - | - |
 |  | | | | | | | |  | | | | | | | | | | | | | |  | |
Rain (mm) | - | - | - | - | - | - | - | - | - | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 |
| Temp. °C | 28 | 27 | 26 | 25 | 24 | 24 | 27 | 28 | 28 | 26 | 25 | 25 | 24 | 24 | 26 | 28 | 28 | 26 | 25 | 25 | 25 | 24 | 27 | 28 |
| Feels °C (?) | 31 | 31 | 30 | 28 | 27 | 27 | 30 | 31 | 31 | 30 | 29 | 29 | 27 | 27 | 29 | 31 | 30 | 30 | 29 | 28 | 29 | 27 | 31 | 32 |
- 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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