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 Saturday 13 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
9.3° 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 8AM is: 0.8m 5s primary swell from a West-southwest direction and 0.1m 9s secondary swell from a East direction, 0.1m 7s secondary swell from a South direction (forecast issued at 06:00am December 13). The wind direction is predicted to be cross-shore.
| Time (EST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (13 Dec) | 3.5ft (1.0m) | 4s |
| Afternoon (13 Dec) | 5ft (1.6m) | 6s |
| Evening (13 Dec) | 5ft (1.6m) | 6s |
Table - waves today at Block Island. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Saturday 13 | Sunday 14 | Monday 15 | Tue 16 | |||||||||||||||||||||
| 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) (?) | 9 | 5 | 4 | 5 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 2 | 31 | 36 | 92 | 177 | 212 | 184 | 128 | 88 | 58 | 27 | 34 | 35 | 36 | 27 | 86 | 81 | 37 | 25 | 24 | 25 | 16 | 16 | 16 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | cross- off | cross | cross | cross | cross | cross- off | cross- off | cross- off | cross- off | off | off | off | cross- off | cross- off | off | off | cross- off | off | cross- off | cross- off | cross- off | cross- off | cross- off | cross- off |
High Tide / height (m) | 2:49AM 0.77 | 3:02PM 0.62 | 3:44AM 0.79 | 3:58PM 0.61 | 4:33AM 0.81 | 4:48PM 0.61 | ||||||||||||||||||
Low Tide / height (m) | 9:21AM 0.14 | 9:25PM 0.08 | 10:14AM 0.12 | 10:07PM 0.08 | 11:01AM 0.09 | 10:44PM 0.08 | ||||||||||||||||||
Saturday 13 | Sunday 14 | Monday 15 | Tue 16 | |||||||||||||||||||||
| Sunrise | - | - | 7:01 | - | - | - | - | - | - | - | 7:03 | - | - | - | - | - | - | - | 7:03 | - | - | - | - | - |
| Sunset | - | - | - | - | 4:16 | - | - | - | - | - | - | - | 4:17 | - | - | - | - | - | - | - | 4:17 | - | - | - |
 | |  | |  | | |  | | |  | | |  | |  | | |  | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 1 | 1 | 3 | 5 | 6 | 5 | 2 | 1 | 1 | 0 | -1 | -1 | -1 | -4 | -5 | -7 | -9 | -8 | -6 | -3 | -3 | -2 | -1 | -1 |
| Feels °C (?) | -6 | -7 | -6 | -5 | -4 | -4 | -6 | -4 | -4 | -6 | -9 | -10 | -11 | -15 | -17 | -19 | -21 | -20 | -16 | -14 | -13 | -11 | -9 | -10 |
- 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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