Surf Forecasts:
Harbor Entrance at Eureka surf forecast from 20 Aug 2026:
- Best quality surf: Sunday 23 Aug, 8PM (local time) - 7.5ft (2.3m), 8s period, NNW swell with glassy winds.
- Most powerful swell: Sunday 23 Aug, 11PM (local time) - 8ft (2.4m), 8s period, NNW swell with 759 kJ wave energy.
- Next surfable swell (1★+): Thursday 20 Aug, 8AM (local time) - 3ft (0.9m), 12s period with WNW swell.
Best Forecast Surf Conditions for Harbor Entrance at Eureka this week:
The surf forecast for Harbor Entrance at Eureka over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Thursday (Aug 20) at 8AM. The primary swell is predicted to be 0.9m and 12s period with a secondary swell of 0.8m and 6s. The wind is predicted to be glassy as the swell arrives.
The most powerful waves expected at Harbor Entrance at Eureka in the next 16 days are 2.4m 8s and forecast to arrive on Sunday (Aug 23) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.5m 14s period and expected on Monday (Aug 24) at 8PM.
| Wave Type | Time (PDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 8AM (Thu 20th Aug) | 3ft (0.9m) 12s |
| Best Surf | 8PM (Sun 23rd Aug) | 7.5ft (2.3m) 8s |
| Most Powerful | 11PM (Sun 23rd Aug) | 8ft (2.4m) 8s |
Table - best surf conditions forecast for Harbor Entrance at Eureka over the next 16 days.
The Lowdown
Alright folks, Rusty here. Let’s break down what’s on the table for Harbor Entrance at Eureka over the next couple of weeks.
Honestly, the first week is a tough one. From Thursday the 20th through the end of August, it’s a long stretch of poor surf. Swell is tiny, mostly under 3 feet, with cross-on or onshore winds messing things up. You’re looking at small, choppy waves – not worth suiting up for.
We do get a bump in size starting Sunday the 23rd into the middle of the following week. Swell builds to 6-7 feet from the NW, with wave energy in the moderate to strong range (500-800). But the wind keeps blowing cross-on or onshore, so it’s going to be bumpy and raw. The wave period is short, around 7-8 seconds, meaning it’s wind-swell, not a clean groundswell. This is for experienced paddlers who can handle a rough surface; for most folks, it’s a pass.
The real highlight shows up on Tuesday the 1st of September. We’ve got a clean 4-foot groundswell from the WNW with a generous 11-second period and moderate wave energy (503). And the wind? It goes glassy in the afternoon. That is a major win for a beach/harbormouth spot like this. Long-period swells on a beach break can sometimes close out, but with that glassy surface, you’ll get proper-shaped waves that hold their line. That’s your best day, no question.
The next day, Wednesday the 2nd, still has some size (around 5 feet, 9-10 second period) but the wind turns cross-on, knocking the quality down to marginal. Still better than the rest, but not as clean as Tuesday. After that, into the second week, the swell fades and the onshore wind returns, so it’s back to waiting.
So circle Tuesday the 1st of September. Clean, glassy, with a decent long-period swell. It’s not huge, but it’ll be the best looking waves we get.
Rusty.
Short Range ForecastMostly dry. Very mild (max 17°C on Sat afternoon, min 12°C on Thu night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 16°C on Mon morning, min 12°C on Sat night). Wind will be generally light. | ||||||||||||||||||
Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | ||||||||||||||
Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | AM | PM | Night | |
Swell Height Map |  |  |  |  |  |  |  | ||||||||||||
Wave Height (m) Direction Period (s) | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NW 8 | NW 7 | NW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | NNW 7 | NNW 7 |
Wave Graph  | |||||||||||||||||||
 kJ | 242 | 221 | 206 | 164 | 117 | 85 | 78 | 64 | 64 | 110 | 372 | 558 | 721 | 572 | 414 | 372 | 311 | 229 | 299 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-on | cross-on | cross-on | glassy | on | on | off | cross-on | cross-on | cross-on | on | cross-on | cross-off | cross-on | cross-on | cross-off | cross-on | on | on |
High Tide | 7:17AM1.08m | 5:59PM1.72m | 8:50AM1.10m | 7:01PM1.69m | 10:00AM1.18m | 8:06PM1.71m | 10:48AM1.26m | 9:06PM1.76m | 11:25AM1.34m | 9:57PM1.82m | 11:56AM1.41m | 10:42PM1.87m | |||||||
Low Tide | 00:44AM0.31m | 11:43AM1.01m | 1:52AM0.27m | 12:49PM1.12m | 2:58AM0.21m | 2:06PM1.16m | 3:55AM0.13m | 3:15PM1.12m | 4:42AM0.05m | 4:12PM1.05m | 5:21AM-0.02m | 4:59PM0.95m | |||||||
 | | |  | |  | | | |  | | | | | | | |  |  | |
 | — | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — | 6:33 | — | — | 6:35 | — | — | 6:35 | — | — |
 | 8:08 | — | 8:07 | — | — | 8:06 | — | — | 8:05 | — | — | 8:02 | — | — | 8:01 | — | — | 8:00 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 13 | 14 | 14 | 13 | 14 | 15 | 14 | 16 | 17 | 15 | 14 | 15 | 14 | 16 | 15 | 13 | 14 | 14 | 13 |
Feels °C | 12 | 13 | 13 | 12 | 13 | 14 | 15 | 15 | 16 | 14 | 12 | 13 | 14 | 14 | 14 | 12 | 12 | 13 | 12 |
Swell 1 Height (m) Direction Period (s) | NNW 6 | NW 6 | WNW 11 | WNW 11 | WNW 11 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NW 8 | SW 19 | NW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 8 | NNW 7 | SW 16 | SW 16 |
| kJ | 113 | 73 | 206 | 164 | 117 | 72 | 74 | 64 | 64 | 110 | 131 | 558 | 721 | 572 | 414 | 372 | 311 | 216 | 163 |
Swell 2 Height (m) Direction Period (s) | WNW 12 | WNW 11 | NW 6 | NNW 7 | NW 7 | WNW 10 | WNW 10 | WNW 10 | WNW 10 | WNW 9 | SSW 15 | SW 18 | SW 18 | SW 18 | SW 18 | SW 17 | SW 17 | S 13 | W 14 |
| kJ | 242 | 221 | 58 | 61 | 49 | 85 | 78 | 54 | 52 | 32 | 75 | 215 | 112 | 255 | 194 | 183 | 222 | 89 | 99 |
Swell 3 Height (m) Direction Period (s) | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SSW 13 | SSW 13 | SSW 12 | SSW 12 | SSW 15 | SSW 16 | S 14 | S 14 | S 14 | S 13 | W 15 | S 13 |
| kJ | 279 | 183 | 173 | 180 | 178 | 101 | 98 | 98 | 67 | 61 | 28 | 45 | 84 | 106 | 106 | 104 | 89 | 69 | 89 |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | — | — | — | NNE 3 | NW 7 | — | — | — | — | — | — | NNW 7 | NNW 7 |
| kJ | — | — | — | — | — | — | — | — | — | 3 | 372 | — | — | — | — | — | — | 229 | 299 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 4 | 34 | 112 | 0 | 112 | 34 | 0 | 4 | 466 | 18 | 251 | 83 | 0 | 173 | 27 | 0 | 106 | 112 | 4 |
Best forecast wave conditions in Humboldt County | |||||||||||||||||||
Best forecast wave conditions in United States | |||||||||||||||||||
Header Global | |||||||||||||||||||
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Information about the Harbor Entrance at Eureka Surf forecast
The above surf forecast table for Harbor Entrance at Eureka provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Harbor Entrance at Eureka can be found by selecting the local surf guide option on the grey menu. Our Harbor Entrance at Eureka 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 (Harbor Entrance at Eureka) 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 Harbor Entrance at Eureka 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.
Harbor Entrance at Eureka is 8 km (5 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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