Big River surfForecast / CAL – Mendocino County / USA

information circle12 Day Weather and Surf, issued 3 am Wednesday 31 Dec 2025 PST
Forecast 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
13.3° C
(Which is 1.4°C warmer than normal for this time of year)


Best Forecast Surf Conditions for Big River this week:

The surf forecast for Big River over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Dec 31) at 1PM. The primary swell is predicted to be 1.4m and 12s period with a secondary swell of 0.2m and 13s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Big River in the next 12 days are 4.5m 11s and forecast to arrive on Saturday (Jan 03) at 10PM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.4m 3s period and expected on Tuesday (Jan 06) at 4PM.

Wave TypeTime (PST) & Date Wave Height & Period
Next good surf (1 star+) 1PM (Wed 31st Dec)4.5ft (1.4m) 12s
Best Surf 1AM (Tue 6th Jan)6ft (1.9m) 11s
Most Powerful10PM (Sat 3rd Jan)15ft (4.5m) 11s

Table - best surf conditions forecast for Big River over the next 12 days.

Updates in  hr  min  s Forecast update imminent

Short Range Forecast Heavy rain (total 41mm), heaviest during Fri night. Very mild (max 16°C on Fri morning, min 10°C on Wed afternoon). Winds increasing (calm on Wed morning, fresh winds from the SE by Fri afternoon).

Days 3-6 Weather Summary Heavy rain (total 65mm), heaviest during Mon morning. Very mild (max 14°C on Sat morning, min 9°C on Mon morning). Winds decreasing (strong winds from the SSE on Sat afternoon, light winds from the SSE by Sun night).

Wednesday
31
Thursday
01
Friday
02
Saturday
03
Sunday
04
Monday
05
Tuesday
06
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
2
2
2
1
1
0
0
0
0
1
0
2
0
0
1
0
2
3
2
0
1
Swell
Height Map
Wave Height (m) & direction (?)
1.4
W
1.4
W
1.4
W
1.4
WNW
1.3
WNW
1.3
WNW
1.1
WNW
2.2
S
4
SSW
2.5
SSW
3.5
SSW
4
SW
3
SW
2.4
SW
2
SSW
2.2
SSW
2.4
SW
1.9
NW
1.7
NW
1.5
NW
1.8
NW
Period(s) (?)12121112111110810991110108881110109
Wave
Graph
(?)Metric surfscale
Energy kJ (?)546537510560430366246597290011772039395017241077474650844806569416486
Wind
(km/h)
5
SE
5
ENE
10
ESE
20
SE
20
SE
15
SE
20
SE
30
SE
35
S
30
SE
40
SSE
30
SSE
30
SSE
35
SSE
20
SSE
20
W
20
SSE
15
ESE
25
E
25
E
25
E
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glasscross-
off
cross-
off
crosscrosscrosscrosscrosscross-
on
crosscrosscrosscross-
on
cross-
on
crosscross-
on
crosscross-
off
cross-
off
cross-
off
cross-
off
High Tide
/ height (m)
9:54PM
1.30
8:13AM
2.19
10:46PM
1.38
9:06AM
2.24
11:33PM
1.45
9:58AM
2.24
12:17AM
1.51
10:50AM
2.18
1:00AM
1.55
11:41AM
2.06
1:42AM
1.60
12:32PM
1.88
2:23AM
1.64
Low Tide
/ height (m)
2:55PM
-0.28
1:50AM
0.92
3:45PM
-0.42
2:51AM
0.93
4:33PM
-0.49
3:49AM
0.90
5:20PM
-0.50
4:46AM
0.86
6:04PM
-0.44
5:43AM
0.82
6:48PM
-0.32
6:42AM
0.78
7:29PM
-0.16
Wednesday
31
Thursday
01
Friday
02
Saturday
03
Sunday
04
Monday
05
Tuesday
06
Sunrise7:33--7:33--7:35--7:35--7:35--7:35--7:35--
Sunset-5:00--5:01--5:02--5:04--5:05--5:05--5:06-
cloud
light rain
heavy rain
light rain
light rain
light rain
cloud
cloud
rain showers
rain showers
light rain
mod rain
mod rain
rain showers
heavy rain
heavy rain
light rain
light rain
mod rain
light rain
mod rain
Rain (mm)
-312313--1931866161825628
Temp. °C141113131314161514141414131412111211121314
Feels °C (?)119109101011986688888877810
  • 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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Information about the Big River Surf forecast

The above surf forecast table for Big River provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Big River can be found by selecting the local surf guide option on the grey menu. Our Big River surf forecast is unique since it includes wave energy (power) that defines the real feel of the surf rather than just the height or the period. If you surf the same spot (Big River) regularly then make a mental note of the wave energy from the surf forecast table each time you go. Very soon you may start to choose your surf days based on the wave energy alone combined with our forecast of favourable offshore wind conditions. Our star ratings will help here and of course you will also find the usual wave height and period predictions on our surf forecasts as well as a full break down of the swell components under our advanced users option (to reveal that, click the little Einstein character under the tide times).

Further information to help with frequently asked questions about our surf forecast for Big River may be found under the help tab on the top menu and also by moving your mouse over the question marks on the surf forecast table itself. Please always bear in mind that the forecast is for near-shore open water and local factors at each surf break influence the actual breaking wave height, such as the beach / reef profile, water depths offshore and shelter.

Big River is 54 km (34 miles) from Ukiah. If you plan a vacation in Mendocino County, look for hotels and other accommodation in Ukiah. Ukiah has rooms for a wide range of budgets as well as car hire and transport links.

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