Surf Forecasts:
Tamarindo surf forecast from 17 Aug 2026:
- Best quality surf: Tuesday 18 Aug, 9PM (local time) - 3.5ft (1.1m), 16s period, SW swell with offshore winds.
- Most powerful swell: Tuesday 18 Aug, 9PM (local time) - 3.5ft (1.1m), 16s period, SW swell with 539 kJ wave energy.
- Next surfable swell (1★+): Monday 17 Aug, 9AM (local time) - 3.5ft (1.1m), 14s period with SW swell.
Best Forecast Surf Conditions for Tamarindo this week:
The surf forecast for Tamarindo over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Monday (Aug 17) at 9AM. The primary swell is predicted to be 1.1m and 14s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Tamarindo in the next 16 days are 1.1m 16s and forecast to arrive on Tuesday (Aug 18) at 9PM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.2m 11s period and expected on Friday (Aug 21) at 3PM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 9AM (Mon 17th Aug) | 3.5ft (1.1m) 14s |
| Best Surf | 9PM (Tue 18th Aug) | 3.5ft (1.1m) 16s |
| Most Powerful | 9PM (Tue 18th Aug) | 3.5ft (1.1m) 16s |
Table - best surf conditions forecast for Tamarindo over the next 16 days.
The Lowdown
Alright folks, Rusty here with a look at what's on the menu for the next couple of weeks in our neck of the woods. We've got a slow start, but there's some real promise on the horizon, especially for those who can wait it out.
The immediate outlook is a bit of a sleepy one. We're looking at clean, small waves, but nothing that's going to get the heart racing just yet. The surf is there, but it's more about getting a wet suit on and enjoying being in the water than chasing anything epic.
First up, Tamarindo is where it's at for this whole stretch. The early part of the week, starting Monday the 17th of August, we've got a consistent 4 ft swell from the SW. It's a proper long-period groundswell at 14 seconds, which means good shape and energy, though those longer gaps between sets will give you time to paddle out. The combined energy is sitting at a solid 428 (moderate), and with a light cross-off breeze from the NE, it's going to be clean. This is all great for the beginners this spot is known for, but it's not a standout.
Tuesday the 18th and Wednesday the 19th keep the same vibe: 4 ft dropping to 3 ft of SW groundswell, but the wind turns offshore on Tuesday afternoon and stays that way through Wednesday morning with that ENE breeze. That’s a major positive, giving us some of the cleanest conditions of the early period. The energy stays moderate, hovering around 361 to 432.
By Thursday the 20th, the swell drops off to 2 ft and the energy takes a noticeable dip to just 187 (weak). The morning is clean with an offshore wind, but the afternoon gets chopped up by a cross-on SW breeze. Friday and Saturday are real small fry – waves dropping to 1 ft and 2 ft. The energy is weak, barely scratching 163. Honestly, the weekend of the 22nd and 23rd is a write-off for any decent waves, despite a few clean windows.
Now, Sunday the 23rd afternoon things start to get interesting. The swell is still small at 2 ft, but the period jumps to a very long 18 seconds and the energy climbs back up to 350. With a gentle offshore wind from the E, it’s clean. This pattern holds through Monday the 24th and Tuesday the 25th with moderate offshore winds, but the size is still just knee-to-waist high.
The standout window is the end of the month. We’re looking at Saturday the 29th of August and Sunday the 30th. This is the real deal. Saturday morning, the swell jumps to a solid 4 ft from the SW, with a long 17-second period. The combined energy explodes to 1017 (very strong). That’s real power. With a slight offshore breeze from the E, it’s going to be clean and punchy. This is the one to circle. It's a bit much for beginners at that size, but for anyone comfortable in the water, it's excellent. Sunday the 30th is almost as good, holding 5 ft of SW swell with 1065 (very strong) energy and a cross-off breeze keeping things clean. Monday the 1st of September sees the size back off a little to 4 ft, but with glassy conditions in the morning. That’s a dream session.
If you can wait, the morning of Saturday the 29th of August is the best on offer. The water temp is average for this time of year, nothing unusual to report.
Rusty.
Short Range ForecastModerate rain (total 15mm), heaviest on Mon night. Warm (max 31°C on Mon morning, min 25°C on Sun night). Wind will be generally light. | Days 5-7 Weather SummaryLight rain (total 6mm), mostly falling on Thu afternoon. Warm (max 32°C on Sat morning, min 26°C on Wed night). Wind will be generally light. | ||||||||||||||||||
Monday 17 | Tuesday 18 | Wednesday 19 | Thursday 20 | Friday 21 | Saturday 22 | ||||||||||||||
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) | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | SW 14 | SW 13 | SSW 9 | SW 13 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 20 |
Wave Graph | |||||||||||||||||||
598 | 428 | 500 | 410 | 428 | 395 | 539 | 355 | 350 | 238 | 183 | 140 | 83 | 76 | 54 | 102 | 95 | 158 | 97 | |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | cross-off | cross-off | cross | off | cross-off | off | off | off | cross-off | off | off | cross-on | off | off | on | glassy | cross-off | cross | off |
High Tide | 5:41AM2.56m | 6:00PM2.29m | 6:22AM2.44m | 6:44PM2.14m | 7:05AM2.29m | 7:29PM1.98m | 7:50AM2.14m | 8:19PM1.83m | 8:42AM2.01m | 9:18PM1.72m | 9:42AM1.92m | 10:27PM1.68m | |||||||
Low Tide | 11:25PM0.15m | 11:57AM0.25m | 00:06AM0.29m | 12:41PM0.36m | 00:48AM0.44m | 1:26PM0.49m | 1:32AM0.59m | 2:16PM0.61m | 2:20AM0.72m | 3:14PM0.71m | 3:18AM0.82m | 4:20PM0.75m | |||||||
— | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | |
— | — | 6:00 | — | — | 6:00 | — | — | 5:59 | — | — | 5:59 | — | — | 5:58 | — | — | 5:58 | — | |
mm | 1 | — | 3 | 5 | 1 | 5 | — | — | — | — | — | 2 | — | — | 2 | — | 1 | 1 | — |
Temp °C | 27 | 31 | 29 | 26 | 29 | 31 | 27 | 29 | 28 | 27 | 30 | 29 | 27 | 31 | 29 | 27 | 32 | 31 | 28 |
Feels °C | 29 | 33 | 32 | 29 | 30 | 33 | 29 | 32 | 31 | 30 | 34 | 31 | 30 | 35 | 31 | 31 | 35 | 35 | 30 |
Swell 1 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 14 | SW 16 | SW 15 | SW 14 | S 8 | S 8 | SSW 9 | S 11 | S 11 | S 11 | S 11 | S 11 | S 10 | S 10 |
598 | 428 | 500 | 410 | 428 | 395 | 539 | 355 | 350 | 136 | 111 | 123 | 275 | 291 | 351 | 291 | 223 | 198 | 154 | |
Swell 2 Height (m) Direction Period (s) | S 7 | S 7 | S 8 | S 7 | S 8 | S 8 | S 8 | S 8 | S 8 | SW 14 | SW 13 | SW 13 | SW 13 | SW 15 | SW 15 | SW 14 | SW 14 | SW 14 | SW 13 |
97 | 106 | 115 | 88 | 100 | 100 | 95 | 103 | 88 | 238 | 183 | 140 | 83 | 76 | 54 | 102 | 95 | 158 | 84 | |
Swell 3 Height (m) Direction Period (s) | S 11 | S 11 | S 11 | NNW 4 | N 5 | N 4 | S 12 | NNW 6 | N 5 | N 5 | N 5 | N 5 | SSW 19 | SW 12 | SW 12 | SW 17 | SW 21 | N 4 | SW 20 |
37 | 20 | 20 | 2 | 4 | 6 | 3 | 6 | 7 | 4 | 4 | 4 | 36 | 36 | 36 | 74 | 68 | 6 | 97 | |
Wind waves Height (m) Direction Period (s) | — | — | — | — | — | — | N 5 | NNE 5 | — | — | — | — | N 5 | N 4 | — | N 4 | NNE 4 | — | N 5 |
— | — | — | — | — | — | 11 | 12 | — | — | — | — | 4 | 1 | — | 6 | 3 | — | 15 | |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 0 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 57 | 0 | 0 | 8 | 0 | 0 | 8 | 0 |
Best forecast wave conditions in Guanacaste | |||||||||||||||||||
Best forecast wave conditions in Costa Rica | |||||||||||||||||||
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Information about the Tamarindo Surf forecast
The above surf forecast table for Tamarindo provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Tamarindo can be found by selecting the local surf guide option on the grey menu. Our Tamarindo 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 (Tamarindo) 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 Tamarindo 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.
Tamarindo is 46 km (29 miles) from Nicoya. If you plan a holiday in Guanacaste, look for hotels and other accommodation in Nicoya. Nicoya has rooms for a wide range of budgets as well as car hire and transport links.











