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:
Block Island surfForecast / Rhode Island / USA
48hr Weather and Surf, issued 6 am Tuesday 16 Dec 2025 ESTForecast update in hr min s Forecast update imminent
Block Island surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Block Island sea temperature is
9.0° C
(Which is normal for this time of year)How big are the waves at Block Island today?
The current surf forecast for Block Island at 1PM is: 1.0m 6s primary swell from a West-southwest direction and 0.3m 11s secondary swell from a Southeast direction, 0.1m 7s secondary swell from a East direction (forecast issued at 06:00am December 16). The wind direction is predicted to be cross-shore.
| Time (EST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (16 Dec) | 3.5ft (1.1m) | 5s |
| Afternoon (16 Dec) | 3ft (0.9m) | 5s |
| Evening (16 Dec) | 4.5ft (1.3m) | 5s |
Table - waves today at Block Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | 1 AM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    |    | ||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 11 | 11 | 6 | 6 | 5 | 5 | 5 | 6 | 6 | 6 | 6 | 7 | 7 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 5 | 6 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 18 | 18 | 74 | 63 | 49 | 68 | 92 | 163 | 190 | 258 | 352 | 541 | 735 | 763 | 603 | 371 | 275 | 154 | 138 | 125 | 114 | 120 | 106 | 166 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross- off | cross- off | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross | cross- off | cross- off | cross- off | cross- off | glass | cross- on | cross- on | on | on | cross- on | on |
High Tide / height (m) | 5:18AM 0.84 | 5:33PM 0.62 | 6:00AM 0.85 | 6:14PM 0.63 | 6:40AM 0.87 | 6:53PM 0.65 | ||||||||||||||||||
Low Tide / height (m) | 11:44AM 0.07 | 11:17PM 0.06 | 12:25PM 0.05 | 11:49PM 0.04 | 1:04PM 0.03 | 12:23AM 0.03 | ||||||||||||||||||
Tuesday 16 | Wednesday 17 | Thursday 18 | Fri 19 | |||||||||||||||||||||
| Sunrise | - | - | 7:03 | - | - | - | - | - | - | - | 7:05 | - | - | - | - | - | - | - | 7:05 | - | - | - | - | - |
| Sunset | - | - | - | - | 4:17 | - | - | - | - | - | - | - | 4:17 | - | - | - | - | - | - | - | 4:19 | - | - | - |
 |  |  | | | | |  | | |  |  | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | -1 | -1 | -2 | 0 | 1 | 1 | 2 | 2 | 4 | 6 | 7 | 7 | 6 | 5 | 5 | 3 | 2 | 2 | 4 | 6 | 8 | 10 | 12 | 12 |
| Feels °C (?) | -9 | -9 | -10 | -8 | -7 | -8 | -7 | -9 | -7 | -5 | -4 | -4 | -4 | -6 | -4 | -4 | -2 | -1 | -1 | 0 | 3 | 4 | 6 | 5 |
- 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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