Third Reef Surf Break

Lat Long: 40.03° N 124.08° W

Third Reef Surf Forecast and Surf Report

Issued: 4 am 12 Aug 2026 (local time)

Forecast update in  hr  min

Today's Third Reef sea temperature is
13.2° C
1.0° 

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 12 Aug 2026:

  • Best quality surf: Thursday 13 Aug, 5AM (local time) - 7ft (2.1m), 8s period, NW swell with cross-offshore winds.
  • Most powerful swell: Saturday 15 Aug, 11AM (local time) - 3.5ft (1.0m), 17s period, SSW swell with 629 kJ wave energy.
  • Next surfable swell (1★+): Thursday 13 Aug, 5AM (local time) - 7ft (2.1m), 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 2.1m and 8s period with a secondary swell of 1.5m 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 1.0m 17s and forecast to arrive on Saturday (Aug 15) at 11AM. Winds are predicted to be onshore at the time the swell arrives.

Wave TypeTime (PDT) & Date Wave Height & Period
Next good surf (1 star+) 5AM (Thu 13th Aug)7ft (2.1m) 8s
Best Surf 5AM (Thu 13th Aug)7ft (2.1m) 8s
Most Powerful11AM (Sat 15th Aug)3.5ft (1.0m) 17s

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


The Lowdown

G’day, I’m Rusty, and I’ve been staring at the charts for Third Reef. It’s a reef set-up, and it’s fairly consistent, but honestly, the next week and a half is a bit of a mixed bag. The water’s sitting at 56°F, which is a bit colder than normal for this time of year – so you’ll be reaching for the thick rubber if you’re paddling out.

We’ve got a bit of a slow start. Wednesday 12th is a write-off – poor surf conditions with a cross-onshore wind and choppy 5ft to 6ft swell. Thursday 13th morning is marginal at best, with a 5ft NW swell and a light onshore wind, but it’s just not clean. The 16-second period swell showing up Thursday afternoon is too small and crosses up. Friday 14th and Saturday 15th are small and marginal too, with light cross-onshore breezes and just 2ft to 3ft of swell. It’s not doing much.

Then we get a bit of a standout on Sunday 16th. Sunday morning is still marginal, but Sunday afternoon – that’s the one. Glassy conditions, light W wind, 3ft of SSW swell at 16 seconds, and the wave energy is moderate (573). It’s a true glass-off, and the reef will clean up nicely. That’s your best window for a paddle in the first week. Monday 17th morning is also glassy and good, but the swell drops a touch.

After that, we hit a bit of a lull. Tuesday 18th through to Thursday 20th morning are mostly marginal or poor, with small swells and cross-onshore winds. Thursday 20th afternoon turns marginal again. Friday 21st and Saturday 22nd are poor to marginal, with small, weak swell. Sunday 23rd and Monday 24th stay marginal, with light cross-onshore winds and tiny 2ft SSW swell.

Now, looking into the second week, there’s a promising window late in the period. On Tuesday 25th, morning is marginal with a 6ft NW swell and moderate energy (953), but it’s a bit choppy. Tuesday afternoon, however, is a big standout: glassy, with 5ft of NW swell and a 16-second period, and the energy is moderate (529). That’s a clean, long-period groundswell coming in – perfect for a reef. Wednesday 26th afternoon is glassy too, with a clean 3ft SW swell. Then Thursday 27th morning and afternoon are both glassy, with 2ft SSW swell at 18 seconds and strong energy (666 and 707) – that’s a very long-period groundswell, and the conditions will be as clean as it gets. So, keep an eye on that Thursday 27th window – it’s a solid late-season runner.

Crowds can show up sometimes at Third Reef, so if you’re after a quiet session, the glassy afternoons towards the end of the period might be your best bet. The 6ft swell on the 25th is pushing into intermediate territory, so keep that in mind.

Stay stoked,
Rusty

Short Range Forecast

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

Days 4-6 Weather Summary

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

Wednesday
12
Thursday
13
Friday
14
Saturday
15
Sunday
16
Monday
17
Tuesday
18
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
0
0
2
2
0
3
1
1
3
2
2
3
2
3
3
2
1
2
1
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)
1.6
NW
8
1.8
NW
8
1.4
NW
8
1.5
NW
8
0.7
SW
16
0.7
SW
16
0.7
SW
15
0.5
SSW
19
0.8
SSW
18
1
SSW
17
1
SSW
16
1
SSW
16
1.1
SSW
16
1
SSW
16
1
SSW
15
1
SSW
14
1
SSW
14
0.9
SSW
14
0.8
SSW
14
0.9
SSW
15
0.8
SSW
16
Wave Graph
Metric surfscale
Energy kJ
296
345
241
289
255
245
232
210
360
629
505
539
612
512
443
437
400
330
253
339
291
Wind (km/h)
20
NW
15
NW
15
N
10
WNW
15
NW
10
NNE
10
SSW
10
WNW
5
N
10
W
5
NW
0
N
10
W
5
W
5
SSE
5
SW
5
WNW
5
ENE
5
WNW
5
NW
0
ESE
Wind State
cross-on
cross-on
cross
on
cross-on
cross-off
cross-on
cross-on
glassy
on
cross-on
glassy
on
glassy
glassy
glassy
on
cross-off
on
cross-on
glassy
High Tide
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
3:58PM1.78m
Low Tide
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
9:32AM0.66m
11:05PM0.34m
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<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
6:24
6:24
6:26
6:26
6:28
6:28
6:30
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
8:16
8:15
8:14
8:13
8:12
8:09
8:08
 mm
Temp °C
16
17
18
14
15
15
13
14
13
14
14
13
15
14
14
14
14
14
15
15
18
Feels °C
13
15
15
14
13
15
13
13
13
13
13
13
14
13
14
14
13
14
14
14
16
  • 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 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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