Surf Forecasts:
Harbor Entrance at Eureka surf forecast from 18 Aug 2026:
- Best quality surf: Sunday 23 Aug, 2AM (local time) - 8ft (2.5m), 8s period, NNW swell with glassy winds.
- Most powerful swell: Sunday 23 Aug, 2AM (local time) - 8ft (2.5m), 8s period, NNW swell with 925 kJ wave energy.
- Next surfable swell (1★+): Tuesday 18 Aug, 2AM (local time) - 5ft (1.6m), 7s period with NNW 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 Tuesday (Aug 18) at 2AM. The primary swell is predicted to be 1.6m and 7s period. 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 2.5m 8s and forecast to arrive on Sunday (Aug 23) at 2AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.8m 15s period and expected on Tuesday (Aug 18) at 2AM.
| Wave Type | Time (PDT) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 2AM (Tue 18th Aug) | 5ft (1.6m) 7s |
| Best Surf | 2AM (Sun 23rd Aug) | 8ft (2.5m) 8s |
| Most Powerful | 2AM (Sun 23rd Aug) | 8ft (2.5m) 8s |
Table - best surf conditions forecast for Harbor Entrance at Eureka over the next 16 days.
The Lowdown
Alright, let’s talk about it. The Harbor Entrance at Eureka isn't giving us much to work with over the next couple of weeks. It’s mostly a write-off, with a bunch of poor, choppy days and a few marginal ones. You gotta be a patient soul to find a wave here right now.
Water temp is 56°, pretty much what we expect for this time of year. Nothing out of the ordinary.
Right out of the gate, Monday the 17th and Tuesday the 18th are rubbish. Onshore NNW wind, waves 5 to 6ft, but short-period and messy. The energy is weak to moderate. Forget it.
Wednesday the 19th shows a little pulse, with the swell reaching 6ft from the NNW. Still short period, so it’s going to be lumpy, but the wind is light in the morning. It’s only a marginal call at best.
Then we hit a long, flat spell. From Thursday the 20th all the way to Tuesday the 26th, the waves mostly die, dropping to 2ft or less. There is a long-period groundswell from the SW around the 24th and 25th, with periods of 16-18 seconds, but it’s tiny. The energy is there, but there’s no size. You’ll see clean water and maybe a ripple, but nothing you can ride. A long stretch of nothing.
The most powerful swell we see is around Sunday the 23rd and into Monday the 24th. The waves come up to 7-7ft from the NW, but with a short, 8-second period. The energy is strong, hitting 763. The wind is light and onshore. This is the most juice in the water, but it’ll be wild and unruly. This is strictly for the experts, a spot like this with that much short-period swell will be a handful.
After that, it’s back to small and weak for the rest of the period. We get a little pulse of NNW swell around September 1st, with waves 5-6ft, but it’s cross-shore and still marginal. The energy is moderate.
So, there you have it. A long, drawn-out stretch of poor to marginal surf. Your best bet for any power is around the 23rd and 24th, but don’t expect glory. For the rest, it’s flat, small, and messy. The forecasts can always change, but as it stands, this isn’t looking good. Hang loose, check your quiver, and wait for the next one.
Rusty.
Short Range ForecastMostly dry. Very mild (max 15°C on Mon afternoon, min 12°C on Mon night). Wind will be generally light. | Days 5-7 Weather SummaryMostly dry. Very mild (max 16°C on Sun morning, min 12°C on Thu night). Wind will be generally light. | |||||||||||||||||||
Mon 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | Sunday 23 | ||||||||||||||
PM | 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) | NNW 7 | NNW 7 | NW 7 | NNW 7 | NNW 8 | NNW 7 | NNW 7 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | NNW 8 | WNW 10 | NW 7 | NNW 7 | NNW 8 | NW 8 | NNW 8 | NNW 8 |
Wave Graph  | ||||||||||||||||||||
 kJ | 198 | 229 | 227 | 251 | 447 | 362 | 343 | 242 | 221 | 206 | 164 | 117 | 83 | 77 | 119 | 362 | 925 | 632 | 458 | 392 |
Wind (km/h) | ||||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | on | glassy | on | cross-on | glassy | on | cross-on | glassy | cross-on | on | cross-on | cross-on | cross-on | cross | on | cross-on | glassy | on | cross-on | glassy |
High Tide | 3:50PM1.87m | 4:32AM1.29m | 4:26PM1.83m | 5:46AM1.15m | 5:08PM1.78m | 7:17AM1.08m | 5:59PM1.72m | 8:50AM1.10m | 7:01PM1.69m | 10:00AM1.18m | 8:06PM1.71m | 10:48AM1.26m | 9:06PM1.76m | |||||||
Low Tide | 10:42PM0.33m | 10:14AM0.64m | 11:40PM0.32m | 10:54AM0.84m | 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 | |||||||
 |  | |  | | | | | | | | | |  | | | | | | | |
 | — | — | 6:28 | — | — | 6:30 | — | — | 6:31 | — | — | 6:31 | — | — | 6:33 | — | — | 6:33 | — | — |
 | 8:12 | — | — | 8:10 | — | — | 8:08 | — | — | 8:07 | — | — | 8:06 | — | — | 8:05 | — | — | 8:02 | — |
mm | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
Temp °C | 15 | 12 | 13 | 13 | 13 | 14 | 14 | 13 | 14 | 14 | 13 | 13 | 14 | 13 | 14 | 15 | 14 | 16 | 15 | 13 |
Feels °C | 14 | 11 | 12 | 11 | 13 | 13 | 12 | 11 | 12 | 13 | 12 | 12 | 12 | 11 | 12 | 14 | 14 | 15 | 14 | 12 |
Swell 1 Height (m) Direction Period (s) | SSW 15 | NNW 7 | SW 14 | SW 15 | SSW 16 | WNW 12 | WNW 11 | NNW 7 | NW 6 | NW 7 | NNW 7 | NNW 7 | NNW 8 | NNW 7 | W 10 | SSW 13 | NNW 8 | NW 8 | NNW 8 | NNW 8 |
| kJ | 272 | 229 | 214 | 217 | 326 | 213 | 186 | 203 | 123 | 103 | 75 | 62 | 72 | 70 | 48 | 67 | 925 | 632 | 458 | 392 |
Swell 2 Height (m) Direction Period (s) | W 9 | SSW 15 | SSW 18 | WNW 14 | WNW 13 | SSW 14 | SSW 15 | WNW 12 | WNW 11 | WNW 11 | WNW 11 | WNW 11 | WNW 10 | WNW 10 | SSW 13 | SW 20 | SW 16 | SW 19 | SW 18 | SW 18 |
| kJ | 38 | 272 | 62 | 120 | 151 | 129 | 275 | 242 | 221 | 206 | 164 | 117 | 83 | 77 | 68 | 98 | 127 | 131 | 215 | 112 |
Swell 3 Height (m) Direction Period (s) | WNW 12 | WNW 8 | WNW 15 | NW 11 | S 10 | SSW 16 | SW 21 | SSW 15 | SSW 14 | SSW 14 | SSW 14 | SSW 14 | SSW 13 | SSW 13 | SW 18 | WNW 12 | SSW 13 | SSW 15 | SSW 15 | SSW 16 |
| kJ | 14 | 22 | 46 | 5 | 2 | 52 | 18 | 279 | 183 | 173 | 180 | 178 | 101 | 98 | 49 | 29 | 31 | 75 | 46 | 84 |
Wind waves Height (m) Direction Period (s) | NNW 7 | — | NW 7 | NNW 7 | NNW 8 | NNW 7 | NNW 7 | — | — | — | — | — | — | — | NW 7 | NNW 7 | — | — | — | — |
| kJ | 198 | — | 227 | 251 | 447 | 362 | 343 | — | — | — | — | — | — | — | 119 | 362 | — | — | — | — |
Nearest Offshore or Glassy | ||||||||||||||||||||
Distance (km) | 112 | 0 | 112 | 85 | 0 | 324 | 85 | 0 | 173 | 85 | 52 | 112 | 85 | 18 | 112 | 83 | 0 | 112 | 83 | 0 |
Best forecast wave conditions in Humboldt County | ||||||||||||||||||||
Best forecast wave conditions in United States | ||||||||||||||||||||
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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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