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Ostional surfForecast / Guanacaste / Costa Rica

information circle12 Day Weather and Surf, issued 5 am Sunday 10 Aug 2025 CST
Forecast update in hr  min  s Forecast update imminent
Ostional surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.
Today's Ostional sea temperature is
28.7° C
 (Which is slightly warmer than usual)

Best Forecast Surf Conditions for Ostional this week:

The surf forecast for Ostional over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Sunday (Aug 10) at 9AM. The primary swell is predicted to be 0.8m and 18s period with a secondary swell of 0.9m and 13s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Ostional in the next 12 days are 1.3m 17s and forecast to arrive on Monday (Aug 11) 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 0.8m 7s period and expected on Saturday (Aug 16) at 3PM.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+) 9AM (Sun 10th Aug)2.5ft (0.8m) 18s
Best Surf 9PM (Sun 10th Aug)3.5ft (1.1m) 16s
Most Powerful 9PM (Mon 11th Aug)4.5ft (1.3m) 17s

Table - best surf conditions forecast for Ostional over the next 12 days.

Hourly12 Days
Guanacaste Surf
Print Surf Table
Updates in  hr  min  s Forecast update imminent 

Short Range Forecast Heavy rain (total 36mm), heaviest during Mon afternoon. Warm (max 28°C on Sun morning, min 24°C on Mon night). Wind will be generally light.

Days 3-6 Weather Summary Heavy rain (total 42mm), heaviest during Wed afternoon. Warm (max 28°C on Wed morning, min 24°C on Fri night). Wind will be generally light.

Sunday
10
Monday
11
Tuesday
12
Wednesday
13
Thursday
14
Friday
15
Saturday
16
AMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNight
Rating
(10 max)
3
3
4
3
3
4
3
2
3
3
3
3
2
2
2
2
1
2
2
0
3
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.8
SW
0.8
SW
1.1
SW
1.1
SW
1.2
SW
1.3
SW
1.3
SW
1.3
SW
1.3
SW
1.1
SW
1.1
SW
1.1
SW
1
SW
1
SW
1
SW
0.6
SW
0.6
SW
0.8
SW
1.2
SSW
0.6
SW
0.8
SW
Period(s) (?)18191917171716161615151514141416161471214
Wave
Graph
(?)Metric surfscale
Energy (?)683827125378410001056919875854652569511441441442381431384352182522
Wind
(km/h)
5
ESE
15
SSE
10
SE
5
SE
5
SW
5
ENE
5
SE
10
SW
10
NNE
5
SE
10
SSE
10
E
5
NNE
10
SSE
10
ESE
5
ENE
15
S
10
ENE
5
ENE
10
WSW
5
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
glasscross-
off		cross-
off		glasscross-
on		offcross-
off		cross-
on		cross-
off		glasscross-
off		offglasscross-
off		offoffcrosscross-
off		glasscross-
on		glass
High Tide
/ height (m)
3:24PM
2.40
3:54AM
2.43
4:06PM
2.44
4:34AM
2.54
4:48PM
2.44
5:15AM
2.60
5:32PM
2.39
5:58AM
2.60
6:19PM
2.30
6:45AM
2.55
7:09PM
2.19
7:36AM
2.45
8:05PM
2.06
Low Tide
/ height (m)
9:16AM
0.38
9:39PM
0.17
10:00AM
0.29
10:17PM
0.13
10:43AM
0.23
10:57PM
0.12
11:28AM
0.21
11:39PM
0.15
12:15PM
0.23
12:24AM
0.22
1:05PM
0.29
1:13AM
0.33
2:01PM
0.37
2:09AM
0.45
Sunday
10
Monday
11
Tuesday
12
Wednesday
13
Thursday
14
Friday
15
Saturday
16
Sunrise5:33--5:33--5:33--5:33--5:33--5:33--5:33--
Sunset-6:02--6:01--6:01--6:00--6:00--6:00--6:00-
thunderstorm mod rainthunderstorm rain showersthunderstorm thunderstorm cloudthunderstorm thunderstorm part cloudthunderstorm thunderstorm rain showersthunderstorm thunderstorm thunderstorm thunderstorm thunderstorm part cloudthunderstorm part cloud
Rain (mm)
288291-33-1011941412-1-
Temp. °C282726272725282725282825282826282826282726
Feels °C (?)322929313128313027323228323229313030323030
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
Map placeholder

Eyeball surf reportRecent Eyeball Surf Reports for Guanacaste

  1. weather stationWind Update Continuing clean conditions at Ostional (light winds from the SSE at Liberia/Tomas Guardia Airport 66 km from Ostional). 0.7m 12s groundswell from the SSW with a 0.5m 16s long period groundswell from the SW. 2 swells combining to make bigger set waves.

    2 hours 31 minutes ago Ostional
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FREE! Surf-Forecast.com widget for your website

The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Ostional surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

View detailed surf forecast for Ostional at:
surf-forecast.com

Information about the Ostional Surf forecast

The above surf forecast table for Ostional provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Ostional can be found by selecting the local surf guide option on the grey menu. Our Ostional 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 (Ostional) 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 Ostional 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.

Ostional is 35 km (22 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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