Surf Forecasts:
Diria surf forecast from 22 Aug 2026:
- Best quality surf: Friday 28 Aug, 9PM (local time) - 4.5ft (1.3m), 18s period, SW swell with cross-offshore winds.
- Most powerful swell: Saturday 29 Aug, 3AM (local time) - 5ft (1.5m), 17s period, SW swell with 1,312 kJ wave energy.
- Next surfable swell (1★+): Saturday 22 Aug, 6AM (local time) - 2ft (0.6m), 14s period with SW swell.
Best Forecast Surf Conditions for Diria this week:
The surf forecast for Diria over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 22) at 6AM. The primary swell is predicted to be 0.6m and 14s period. The wind is predicted to be cross-offshore as the swell arrives.
The most powerful waves expected at Diria in the next 16 days are 1.5m 17s and forecast to arrive on Saturday (Aug 29) at 3AM. Winds are predicted to be offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.1m 11s period and expected on Saturday (Aug 22) at 6AM.
| Wave Type | Time (CST) & Date | Wave Height & Period |
|---|---|---|
| Next good surf (1 star+) | 6AM (Sat 22nd Aug) | 2ft (0.6m) 14s |
| Best Surf | 9PM (Fri 28th Aug) | 4.5ft (1.3m) 18s |
| Most Powerful | 3AM (Sat 29th Aug) | 5ft (1.5m) 17s |
Table - best surf conditions forecast for Diria over the next 16 days.
The Lowdown
Alright surfers, Rusty here. Let’s break down the next couple of weeks at Diria.
It’s a slow start, but it builds into some real quality. The water is a touch warmer than usual at 86°.
The first few days are pretty ordinary. Friday the 21st afternoon has tiny 1ft SW groundswell with a very long 15 second period, and light offshore wind. It’s clean but weak (111 energy). Surfable but that’s about it.
Saturday the 22nd is a mess with storms and bad wind. Sunday the 23rd shapes up in the afternoon though – 2ft SW swell at 18 seconds with a gentle offshore and moderate energy (344). Clean little session on a log.
Tuesday the 25th is another clean window, with 2ft SW swell and a gentle offshore in the morning, then going glassy in the afternoon. Not big, but clean.
The real standout starts Friday the 28th morning. Swell hits 3ft from the SW with a 19 second period and dead calm winds. Strong energy (804). Diria will be rippable.
Saturday the 29th is the absolute pick. Saturday morning has 5ft SW swell at 16 seconds with moderate offshore and massive energy (1153). That’s expert territory. Then Saturday afternoon goes glassy at 5ft with enormous energy (1385). This is the session you wait for. Diria will be pumping.
Sunday the 30th holds 5ft in the morning with light offshore, but the period drops. Still good, but the afternoons get choppy.
Into September, Monday the 31st and Tuesday the 1st sees 3ft to 4ft swell. Mornings look clean with glassy or light winds, afternoons get cross-onshore. Wednesday the 2nd morning is another nice clean window with 2ft but a very long 17 second period.
Friday the 5th and Saturday the 6th of September see a pulse back up – Friday morning has 4ft SW swell at 17 seconds with light cross-off wind. Saturday morning is glassy with 4ft. A solid finish.
Bottom line: circle Saturday the 29th of August for the best conditions. The morning has power, the afternoon has perfection.
Rusty.
Short Range ForecastLight rain (total 6mm), mostly falling on Mon afternoon. Warm (max 33°C on Sat morning, min 26°C on Fri night). Wind will be generally light. | Days 5-7 Weather SummaryHeavy rain (total 25mm), heaviest during Thu morning. Warm (max 30°C on Tue morning, min 25°C on Mon night). Wind will be generally light. | ||||||||||||||||||
Saturday 22 | Sunday 23 | Monday 24 | Tuesday 25 | Wednesday 26 | Thursday 27 | ||||||||||||||
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 20 | SW 19 | SW 18 | SW 18 | SW 18 | SW 17 | SW 16 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | SW 14 | SW 15 | SW 18 | SW 16 |
Wave Graph  | |||||||||||||||||||
 kJ | 100 | 95 | 155 | 97 | 184 | 260 | 327 | 255 | 305 | 322 | 211 | 206 | 191 | 110 | 107 | 74 | 76 | 155 | 248 |
Wind (km/h) | |||||||||||||||||||
Wind State on-shore cross-onshore cross-shore cross-offshore off-shore glassy | off | cross-off | cross | off | cross-off | off | off | cross-off | cross-on | cross-off | cross-off | cross-on | cross-off | off | cross-on | off | cross-off | glassy | off |
High Tide | 9:42AM1.92m | 10:27PM1.68m | 10:48AM1.90m | 11:37PM1.71m | 11:52AM1.94m | 00:37AM1.80m | 12:47PM2.02m | 1:25AM1.94m | 1:34PM2.12m | 2:06AM2.09m | 2:16PM2.21m | 2:43AM2.23m | |||||||
Low Tide | 3:18AM0.82m | 4:20PM0.75m | 4:26AM0.86m | 5:27PM0.73m | 5:34AM0.84m | 6:25PM0.66m | 6:34AM0.77m | 7:13PM0.57m | 7:24AM0.67m | 7:54PM0.47m | 8:08AM0.56m | 8:30PM0.38m | |||||||
 |  |  | |  | | | | |  | | | |  | | | | | | |
 | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — | 5:33 | — | — |
 | — | — | 5:58 | — | — | 5:57 | — | — | 5:57 | — | — | 5:55 | — | — | 5:55 | — | — | 5:54 | — |
mm | — | — | 1 | — | — | 2 | — | — | 3 | 1 | — | 2 | 3 | 1 | 4 | 5 | 5 | 4 | 3 |
Temp °C | 29 | 33 | 31 | 29 | 33 | 33 | 28 | 32 | 29 | 26 | 30 | 29 | 26 | 29 | 27 | 26 | 28 | 28 | 26 |
Feels °C | 31 | 36 | 34 | 31 | 33 | 35 | 29 | 35 | 32 | 27 | 33 | 33 | 29 | 32 | 30 | 30 | 32 | 33 | 29 |
Swell 1 Height (m) Direction Period (s) | S 11 | S 11 | S 10 | S 10 | S 9 | S 9 | S 9 | S 9 | S 9 | SW 16 | S 9 | S 9 | N 5 | S 7 | S 7 | S 7 | S 7 | SSW 7 | SW 16 |
| kJ | 284 | 223 | 194 | 153 | 109 | 106 | 109 | 104 | 102 | 322 | 55 | 52 | 25 | 61 | 74 | 94 | 62 | 91 | 248 |
Swell 2 Height (m) Direction Period (s) | SW 14 | SW 14 | SW 14 | SW 13 | SSW 13 | SW 18 | SW 18 | SW 18 | SW 17 | S 9 | SW 16 | SW 16 | SW 15 | SW 15 | SW 15 | N 5 | WSW 6 | SW 15 | SW 7 |
| kJ | 100 | 95 | 155 | 84 | 116 | 260 | 327 | 255 | 305 | 76 | 211 | 206 | 191 | 110 | 107 | 11 | 28 | 106 | 37 |
Swell 3 Height (m) Direction Period (s) | SW 17 | SW 21 | N 5 | SW 20 | SW 19 | SW 13 | SW 12 | SW 12 | N 5 | SW 12 | SW 12 | SW 11 | S 8 | SW 11 | N 5 | SW 14 | SW 15 | SW 18 | S 7 |
| kJ | 74 | 68 | 7 | 97 | 184 | 84 | 75 | 72 | 11 | 35 | 35 | 31 | 44 | 19 | 4 | 74 | 76 | 155 | 39 |
Wind waves Height (m) Direction Period (s) | NNE 5 | NNE 5 | WSW 6 | NNE 5 | NNE 3 | N 4 | NE 4 | N 5 | — | N 5 | NNE 5 | N 5 | — | NNE 5 | — | — | — | — | N 5 |
| kJ | 7 | 4 | 6 | 7 | 2 | 19 | 4 | 16 | — | 11 | 9 | 15 | — | 13 | — | — | — | — | 17 |
Nearest Offshore or Glassy | |||||||||||||||||||
Distance (km) | 0 | 8 | 11 | 0 | 28 | 0 | 0 | 11 | 9 | 0 | 0 | 1 | 0 | 0 | 9 | 0 | 0 | 0 | 0 |
Best forecast wave conditions in Guanacaste | |||||||||||||||||||
Best forecast wave conditions in Costa Rica | |||||||||||||||||||
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Information about the Diria Surf forecast
The above surf forecast table for Diria provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Diria can be found by selecting the local surf guide option on the grey menu. Our Diria 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 (Diria) 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 Diria 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.
Diria is 47 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.
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