Third Reef Surf Break

Lat Long: 40.03° N 124.08° W

Third Reef Surf Forecast and Surf Report

Issued: 4 am 11 Aug 2026 (local time)

Forecast update in  hr  min

Today's Third Reef sea temperature is
13.5° C
0.6° 

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


Third Reef surf forecast from 11 Aug 2026:

  • Best quality surf: Thursday 13 Aug, 5AM (local time) - 7ft (2.2m), 8s period, NW swell with cross-offshore winds.
  • Most powerful swell: Thursday 13 Aug, 5AM (local time) - 7ft (2.2m), 8s period, NW swell with 639 kJ wave energy.
  • Next surfable swell (1★+): Thursday 13 Aug, 5AM (local time) - 7ft (2.2m), 8s period with NW swell.

Best Forecast Surf Conditions for Third Reef this week:

The surf forecast for Third Reef over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 13) at 5AM. The primary swell is predicted to be 2.2m and 8s period with a secondary swell of 1.6m and 8s. Another secondary swell of 0.7m and 16s is also forecast. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Third Reef in the next 16 days are 2.2m 8s and forecast to arrive on Thursday (Aug 13) at 5AM. Winds are predicted to be cross-offshore at the time the swell arrives.

Wave TypeTime (PDT) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Thu 13th Aug)7ft (2.2m) 8s
Best Surf 5AM (Thu 13th Aug)7ft (2.2m) 8s
Most Powerful 5AM (Thu 13th Aug)7ft (2.2m) 8s

Table - best surf conditions forecast for Third Reef over the next 16 days.


The Lowdown

Alright folks, Rusty here. Let’s have a look at what’s on offer for the next couple of weeks.

Alright, the short version is we’ve got a bit of a flat spell to kick things off, and the next 16 days are looking pretty average. There’s nothing that’s gonna blow your mind. The first real shot at a wave comes on Tuesday the 11th of August, but it’s nothing to get too excited about. We’re looking at Third Reef, a reef break that’s fairly consistent. The water temp is sitting at 56°F, which is about 1°F cooler than the long-term average, so it’s pretty much what you’d expect for this time of year. No major surprises there.

The first few days are a write-off. Tuesday morning the 11th sees a 5ft swell from the NW, but the wind is a cross-on from the WNW at 9 mph, making it choppy. The combined energy is moderate at 525, but the quality is just marginal. It’s not worth paddling out for. Tuesday afternoon is worse, with a bump to 6ft from the NW but the cross-on wind keeps it messy. Wednesday the 12th is the same story – 6ft to 6ft, cross-on, choppy. Nothing doing.

Thursday morning the 13th is a bit of a tease. We get a 5ft NW swell with a WSW wind at 6 mph that’s offshore, blowing directly onshore from the west. The combined energy is 557. The wind is light, so it might be a little cleaner, but the comment says it’s still marginal. Afternoon goes back to cross-on. Not the one.

Friday the 14th to Monday the 17th of August, we see a real shift. The swell drops right down to 2ft to 4ft, and it’s coming from the SSW. The period jumps up to 15-19 seconds, which is a very long period groundswell. That’s a lot of energy for that size, but the combined energy is still moderate, between 463 and 678. The problem is, with that long period and a SSW direction, it’s going to be breaking straight at a beach break if it’s a beach, but this is a reef. The wind is generally light, with a few windows of offshore wind, but the surf is just too small to be any good. The best of this run is probably Saturday morning the 15th, with a 3ft SSW swell, 17-second period, and a light offshore wind from the west. The combined energy is 648. It’s marginal, but it’s the best we’ve seen so far. Still, it’s not a standout.

We then hit a long, flat stretch. From Tuesday the 18th through to Sunday the 23rd of August, the swell is tiny, mostly 1ft to 3ft, with some very long period signals but no real power. The combined energy drops to 214-410. The wind is mostly cross-on or light offshore. It’s just not worth it. There’s a glimmer on Friday morning the 21st – 3ft from the SSW with a 14-second period, and the wind is glassy. The combined energy is 420. The comment says “expect good surf conditions,” but at 3ft, it’s barely a ripple. It’s the cleanest we’ll see, but it’s a beginner wave at best.

The final few days, from Monday the 24th to Wednesday the 26th of August, see a bit of a pulse, but it’s all bad. The wind cranks up to 12-19 mph from the NW, cross-on, making it lumpy and choppy. The swell is 2ft to 2ft from the SW, with long periods, but the combined energy is moderate to low. The surf is poor. Forget it.

So, the standout, if you can call it that, is a tie between the marginal but cleanest conditions on Friday morning the 21st of August, with glassy conditions, or the slightly bigger 4ft SSW swell on Sunday morning the 16th of August, with a light offshore wind. Neither is a true standout by any stretch. The swell just isn’t there, and the wind is rarely in our favour. For a reef break, the long period swells from the SSW are not the optimum direction, which is WNW. It’s a tough run.

Stay patient, and don’t bother rushing out. The forecast can change, but right now, it’s a long wait.

Rusty.

Short Range Forecast

Mostly dry. Very mild (max 19°C on Tue night, min 12°C on Thu night). Wind will be generally light.

Days 4-6 Weather Summary

Mostly dry. Very mild (max 15°C on Sat afternoon, min 12°C on Fri night). Wind will be generally light.

Tuesday
11
Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
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
0
2
0
0
2
2
0
3
2
1
3
1
2
3
2
2
3
2
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.5
NW
9
1.8
NW
8
1.4
NW
8
1.7
NW
8
1.8
NW
8
1.5
NW
8
1.6
NW
8
1.4
NW
8
1.6
NW
7
0.7
SW
15
0.5
SSW
19
0.8
SSW
18
1
SSW
17
1
SSW
16
1.1
SSW
16
1.1
SSW
16
1.1
SSW
16
1.1
SSW
14
1
SSW
14
0.9
SSW
14
0.9
SSW
14
Wave Graph
Metric surfscale
Energy kJ
328
448
241
352
345
277
322
235
262
232
210
360
576
505
635
612
604
515
437
330
330
Wind (km/h)
15
WNW
15
NW
15
N
20
NW
15
NW
15
N
10
WNW
15
NW
10
NNE
5
SSW
5
NW
5
N
10
W
10
NW
5
ENE
10
W
10
WNW
5
ENE
5
WSW
5
WNW
0
E
Wind State
cross-on
cross-on
cross
cross-on
cross-on
cross
on
cross-on
cross-off
cross-on
cross-on
glassy
on
cross-on
glassy
on
cross-on
glassy
on
cross-on
glassy
High Tide
11:46AM1.52m
10:37PM2.21m
12:25PM1.62m
11:32PM2.16m
1:02PM1.70m
00:26AM2.05m
1:38PM1.77m
1:18AM1.90m
2:13PM1.81m
2:11AM1.71m
2:47PM1.83m
3:06AM1.52m
3:22PM1.81m
4:06AM1.35m
Low Tide
4:37PM0.81m
5:48AM-0.37m
5:34PM0.68m
6:30AM-0.30m
6:27PM0.56m
7:09AM-0.16m
7:20PM0.47m
7:46AM0.03m
8:12PM0.41m
8:22AM0.24m
9:06PM0.37m
8:57AM0.45m
10:03PM0.35m
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clear
clear
part cloud
clear
clear
part cloud
clear
part cloud
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part cloud
part cloud
part cloud
clear
part cloud
part cloud
clear
part cloud
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<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:22
6:24
6:24
6:26
6:26
6:28
6:28
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:17
8:16
8:15
8:14
8:13
8:12
8:09
 mm
Temp °C
15
17
19
17
18
18
14
15
14
14
14
13
14
15
13
15
14
14
15
14
13
Feels °C
14
15
16
14
16
15
13
13
14
13
13
14
12
13
13
14
13
14
15
14
13
  • Map Icons:
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  • 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 Third Reef Surf forecast

The above surf forecast table for Third Reef provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Third Reef can be found by selecting the local surf guide option on the grey menu. Our Third Reef 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 (Third Reef) 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 Third Reef 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.

Third Reef is 85 km (53 miles) from Eureka. If you plan a vacation in Humboldt County, look for hotels and other accommodation in Eureka. Eureka has rooms for a wide range of budgets as well as car hire and transport links.

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