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Surf Forecasts:
Big River surfForecast / CAL – Mendocino County / USA
48hr Weather and Surf, issued 3 am Wednesday 10 Dec 2025 PSTForecast update in hr min s Forecast update imminent
Big River surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Big River sea temperature is
12.9° C
(Which is slightly warmer than usual)How big are the waves at Big River today?
The current surf forecast for Big River at 8AM is: 2.5m 13s primary swell from a Northwest direction and 0.1m 15s secondary swell from a Southwest direction (forecast issued at 03:00am December 10). The wind direction is predicted to be offshore and the swell rating is 4.
| Time (PST) & Date | Wave Height | Wave Period |
|---|---|---|
| Morning (10 Dec) | 8ft (2.5m) | 13s |
| Afternoon (10 Dec) | 8ft (2.5m) | 13s |
| Evening (10 Dec) | 8ft (2.5m) | 14s |
Table - waves today at Big River. (Swell directed towards the surf break)
Updates in hr min s Forecast update imminent
Wednesday 10 | Thursday 11 | Friday 12 | ||||||||||||||||||||||
| 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 | 4 AM | 7 AM | 10 AM | 1 PM | 4 PM | 7 PM | 10 PM | |
Rating (10 max) | ||||||||||||||||||||||||
Swell Height Map |    |    |    | |||||||||||||||||||||
| Wave Height (m) & direction (?) | ||||||||||||||||||||||||
| Period(s) (?) | 12 | 14 | 14 | 13 | 13 | 13 | 13 | 14 | 14 | 14 | 14 | 15 | 16 | 15 | 15 | 15 | 14 | 14 | 14 | 13 | 13 | 13 | 13 | 12 |
Wave (?)Graph  | ||||||||||||||||||||||||
 kJ (?) | 1278 | 2633 | 2276 | 2143 | 1990 | 1960 | 2440 | 2569 | 2569 | 2728 | 2968 | 3576 | 3283 | 3116 | 3092 | 2913 | 2557 | 2169 | 1796 | 1474 | 1326 | 1120 | 995 | 800 |
Wind (km/h) | ||||||||||||||||||||||||
| Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy | off | cross- off | cross- off | cross- off | cross | cross- off | cross- off | cross- off | cross- off | cross- off | off | glass | cross | cross- off | glass | off | off | cross- off | cross- off | glass | cross- on | glass | glass | cross- off |
High Tide / height (m) | 4:06AM 1.55 | 2:46PM 1.56 | 4:54AM 1.61 | 4:02PM 1.36 | 5:38AM 1.67 | 5:28PM 1.22 | ||||||||||||||||||
Low Tide / height (m) | 9:17AM 0.88 | 9:44PM 0.08 | 10:40AM 0.78 | 10:32PM 0.27 | 11:58AM 0.63 | |||||||||||||||||||
Wednesday 10 | Thursday 11 | Friday 12 | ||||||||||||||||||||||
| Sunrise | - | - | - | 7:22 | - | - | - | - | - | - | - | 7:24 | - | - | - | - | - | - | - | 7:24 | - | - | - | - |
| Sunset | - | - | - | - | - | 4:51 | - | - | - | - | - | - | - | 4:52 | - | - | - | - | - | - | - | 4:52 | - | - |
 | | |  |  | |  | | | | | | | | | | | | | | | | | | |
Rain (mm) | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Temp. °C | 12 | 11 | 11 | 13 | 13 | 12 | 12 | 12 | 12 | 11 | 11 | 13 | 14 | 13 | 12 | 13 | 12 | 12 | 13 | 15 | 15 | 14 | 13 | 14 |
| Feels °C (?) | 11 | 9 | 9 | 11 | 10 | 10 | 11 | 11 | 11 | 9 | 9 | 11 | 11 | 11 | 10 | 11 | 9 | 9 | 10 | 12 | 12 | 12 | 10 | 11 |
- 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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