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 am Monday 15 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
28.7° C
(Which is 1.5°C warmer than normal for this time of year)How big are the waves at Islita today?
The current surf forecast for Islita at 8AM is: 0.9m 7s primary swell from a South-southwest direction and 0.4m 15s secondary swell from a Southwest direction (forecast issued at 05:00am December 15). The wind direction is predicted to be cross-offshore.
| Time (CST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (15 Dec) | 3ft (0.9m) | 7s |
| Afternoon (15 Dec) | 1.5ft (0.4m) | 15s |
| Evening (15 Dec) | 3ft (0.9m) | 6s |
Table - waves today at Islita. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Monday 15 | Tuesday 16 | Wednesday 17 | Thu 18 | |||||||||||||||||||||
| 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 | 9 PM | 0 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 15 | 7 | 7 | 7 | 15 | 6 | 6 | 16 | 16 | 16 | 13 | 13 | 13 | 14 | 15 | 15 | 15 | 15 | 15 | 15 | 14 | 13 | 13 | 13 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 104 | 79 | 79 | 77 | 77 | 55 | 68 | 91 | 91 | 91 | 62 | 62 | 62 | 67 | 134 | 134 | 171 | 134 | 134 | 75 | 74 | 108 | 109 | 111 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | off | cross- off | glass | glass | glass | off | off | off | cross- off | cross- off | glass | on | glass | glass | cross- off | cross- off | glass | glass | glass | on | glass | glass | glass |
High Tide / height (m) | 11:23AM 1.90 | 11:38PM 2.19 | 12:18PM 1.93 | 12:26AM 2.22 | 1:06PM 1.98 | |||||||||||||||||||
Low Tide / height (m) | 5:18AM 0.67 | 5:19PM 0.78 | 6:10AM 0.62 | 6:11PM 0.76 | 6:57AM 0.54 | 6:59PM 0.72 | ||||||||||||||||||
Monday 15 | Tuesday 16 | Wednesday 17 | Thu 18 | |||||||||||||||||||||
| Sunrise | - | 5:48 | - | - | - | - | - | - | - | 5:50 | - | - | - | - | - | - | - | 5:50 | - | - | - | - | - | - |
| Sunset | - | - | - | - | 5:22 | - | - | - | - | - | - | - | 5:22 | - | - | - | - | - | - | - | 5:23 | - | - | - |
 |  |  |  | |  | |  |  | | | | | | | | |  | | | | | | | |
Rain (mm) | 2 | 1 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | 1 | - | - | - |
| Temp. °C | 25 | 25 | 27 | 29 | 27 | 26 | 25 | 25 | 24 | 24 | 26 | 29 | 28 | 26 | 25 | 25 | 24 | 24 | 26 | 28 | 27 | 26 | 25 | 25 |
| Feels °C (?) | 29 | 29 | 30 | 33 | 31 | 30 | 28 | 28 | 26 | 27 | 28 | 32 | 30 | 30 | 29 | 28 | 27 | 27 | 29 | 31 | 30 | 30 | 29 | 29 |
- Map Icons:
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Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)- Wind Speed (km/h)
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