Big River Surf Break

Lat Long: 39.30° N 123.80° W

Big River Surf Forecast and Surf Report

Issued: 10 am 04 Sep 2026 (local time)

Forecast update in  hr  min

Today's Big River sea temperature is
12.6°C
2.2° 

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 4 Sep 2026:

  • Best quality surf: Friday 11 Sep, 5AM (local time) - 7.5ft (2.3m), 10s period, S swell with glassy winds.
  • Most powerful swell: Friday 11 Sep, 2AM (local time) - 8ft (2.4m), 10s period, S swell with 1,161 kJ wave energy.
  • Next surfable swell (1★+): Friday 4 Sep, 8PM (local time) - 3.5ft (1.0m), 17s period with SSW 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 Friday (Sep 04) at 8PM. The primary swell is predicted to be 1.7m and 10s period with a secondary swell of 1.0m and 17s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Big River in the next 16 days are 2.4m 10s and forecast to arrive on Friday (Sep 11) at 2AM. Winds are predicted to be cross-shore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.5m 6s period and expected on Sunday (Sep 06) at 11PM.

Wave TypeTime (PDT) & Date Wave Height & Period
Next good surf (1 star+) 8PM (Fri 4th Sep)3.5ft (1.0m) 17s
Best Surf 5AM (Fri 11th Sep)7.5ft (2.3m) 10s
Most Powerful 2AM (Fri 11th Sep)8ft (2.4m) 10s

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


Short Range Forecast

Mostly dry. Very mild (max 16°C on Fri morning, min 11°C on Sun morning). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Very mild (max 18°C on Wed night, min 12°C on Mon morning). Wind will be generally light.

Friday
4
Saturday
5
Sunday
6
Monday
7
Tuesday
8
Wednesday
9
Thursday
10
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
3
2
3
2
1
3
2
1
3
2
2
2
1
1
2
1
1
3
3
3
3
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.9
NW
11
1.8
NW
10
1.1
SSW
16
1.1
SSW
16
1.3
SSW
16
1
SSW
15
1
SSW
15
1
SSW
14
0.8
SSW
14
0.9
SSE
14
0.9
SSE
13
0.9
SSE
14
1
S
13
1
S
13
1.1
S
12
1.2
S
12
0.7
SSW
13
0.8
SW
18
0.9
SW
17
0.9
SW
17
2.4
S
10
Wave Graph
Metric surfscale
Energy kJ
835
651
651
612
796
434
405
400
269
327
299
313
350
335
359
413
178
366
419
419
1161
Wind (km/h)
5
WNW
15
NW
5
NE
10
W
15
NW
5
NE
15
NW
20
NW
5
NNE
10
W
15
NW
5
NNE
10
NW
10
NW
0
ESE
10
WSW
5
NW
10
NNE
10
N
10
N
10
SSE
Wind State
cross-on
cross
off
cross-on
cross
off
cross
cross
off
cross-on
cross
off
cross
cross
glassy
on
cross
off
cross-off
cross-off
cross
High Tide
4:57PM1.82m
8:09AM1.19m
6:12PM1.83m
9:08AM1.27m
7:27PM1.87m
9:52AM1.37m
8:34PM1.91m
10:28AM1.47m
9:34PM1.93m
11:02AM1.57m
10:29PM1.91m
11:34AM1.66m
11:20PM1.84m
Low Tide
10:16AM0.93m
00:48AM0.02m
11:43AM0.98m
1:56AM-0.06m
1:13PM0.94m
2:54AM-0.13m
2:27PM0.84m
3:43AM-0.16m
3:29PM0.69m
4:26AM-0.14m
4:23PM0.53m
5:05AM-0.07m
5:12PM0.39m
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
clear
part cloud
cloud
cloud
cloud
part cloud
cloud
cloud
cloud
cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:46
6:47
6:47
6:48
6:48
6:50
6:50
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
7:40
7:39
7:37
7:37
7:35
7:32
7:31
 mm
2
Temp °C
16
16
15
15
15
14
14
15
14
16
16
14
16
15
14
15
15
18
18
20
19
Feels °C
15
14
14
14
13
13
12
12
12
14
14
13
15
13
14
14
14
16
16
18
18
  • 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 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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