Big River Surf Break

Lat Long: 39.30° N 123.80° W

Big River Surf Forecast and Surf Report

Issued: 4 am 08 Sep 2026 (local time)

Forecast update in  hr  min

Today's Big River sea temperature is
15.0°C
0.2° 

Big River surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Big River surf forecast from 8 Sep 2026:

  • Best quality surf: Thursday 10 Sep, 8AM (local time) - 3ft (0.9m), 17s period, SW swell with glassy winds.
  • Most powerful swell: Friday 11 Sep, 2PM (local time) - 7.5ft (2.3m), 8s period, NW swell with 661 kJ wave energy.
  • Next surfable swell (1★+): Tuesday 8 Sep, 8AM (local time) - 3ft (0.9m), 13s period with S swell.

Best Forecast Surf Conditions for Big River this week:

The surf forecast for Big River over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 08) at 8AM. The primary swell is predicted to be 0.9m and 13s period with a secondary swell of 1.3m and 7s. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Big River in the next 16 days are 2.3m 8s and forecast to arrive on Friday (Sep 11) at 2PM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (PDT) & Date Wave Height & Period
Next good surf (1 star+) 8AM (Tue 8th Sep)3ft (0.9m) 13s
Best Surf 8AM (Thu 10th Sep)3ft (0.9m) 17s
Most Powerful 2PM (Fri 11th Sep)7.5ft (2.3m) 8s

Table - best surf conditions forecast for Big River over the next 16 days.


Short Range Forecast

Mostly dry. Warm (max 25°C on Wed morning, min 13°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Very mild (max 16°C on Sat afternoon, min 11°C on Sat night). Wind will be generally light.

Tuesday
8
Wednesday
9
Thursday
10
Friday
11
Saturday
12
Sunday
13
Monday
14
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
1
2
1
1
2
2
2
3
1
1
3
1
0
2
1
2
2
1
2
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.9
S
12
1.1
S
12
0.8
S
11
1
NW
8
0.7
SW
19
0.7
SW
18
0.9
SSW
17
1
SW
17
2.1
NW
8
2.1
NW
8
2.3
NW
8
2.1
NW
8
1.6
NW
10
0.9
SW
14
0.8
SW
14
0.7
SW
14
1.3
NW
7
1.6
NW
7
1.8
NW
8
2
NW
7
1.7
NW
7
Wave Graph
Metric surfscale
Energy kJ
251
356
154
132
364
312
504
553
515
596
645
499
441
301
238
186
169
273
364
398
253
Wind (km/h)
10
W
5
NW
10
NE
10
WNW
10
NW
0
NNE
10
NW
15
NW
10
NNW
20
NW
20
NW
10
NNW
20
NW
25
NW
10
NNE
10
WNW
15
NNW
5
N
10
WNW
25
NNW
10
NNW
Wind State
cross-on
cross
off
cross
cross
glassy
cross
cross
cross-off
cross
cross
cross-off
cross
cross
cross-off
cross
cross-off
cross-off
cross
cross-off
cross-off
High Tide
10:28AM1.47m
9:34PM1.93m
11:02AM1.57m
10:29PM1.91m
11:34AM1.66m
11:20PM1.84m
12:06PM1.74m
00:10AM1.74m
12:37PM1.78m
00:59AM1.61m
1:07PM1.79m
1:51AM1.47m
1:39PM1.77m
2:48AM1.34m
Low Tide
3:29PM0.69m
4:26AM-0.14m
4:23PM0.53m
5:05AM-0.07m
5:12PM0.39m
5:42AM0.04m
6:00PM0.27m
6:16AM0.19m
6:46PM0.20m
6:49AM0.36m
7:33PM0.15m
7:22AM0.53m
8:21PM0.15m
clear
clear
clear
clear
clear
part cloud
part cloud
part cloud
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:48
6:50
6:50
6:52
6:52
6:54
6:54
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:35
7:32
7:31
7:30
7:29
7:27
7:24
 mm
Temp °C
22
19
21
25
23
19
17
17
14
15
15
13
14
16
15
14
15
13
15
15
14
Feels °C
20
17
18
22
20
19
16
15
14
12
12
11
10
12
11
12
12
12
14
11
12
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder
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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 16 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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