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Surf Forecasts:

Ostional surfForecast / Guanacaste / Costa Rica

information circle12 Day Weather and Surf, issued 5 pm Wednesday 01 Oct 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
28.9° C
 (Which is 1.2°C warmer than normal for this time of year)

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 Wednesday (Oct 01) at 9PM. The primary swell is predicted to be 0.4m and 15s period. The wind is predicted to be offshore as the swell arrives.

The most powerful waves expected at Ostional in the next 12 days are 0.9m 17s and forecast to arrive on Saturday (Oct 04) at 12PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 7s period and expected on Saturday (Oct 04) at 6PM.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Wed 1st Oct)1.5ft (0.4m) 15s
Best Surf 9AM (Mon 6th Oct)3ft (0.9m) 16s
Most Powerful12PM (Sat 4th Oct)3ft (0.9m) 17s

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

Updates in  hr  min  s Forecast update imminent 
12 DaysHourly
Print Table

Short Range Forecast Heavy rain (total 39mm), heaviest during Wed afternoon. Warm (max 28°C on Sat morning, min 24°C on Fri night). Wind will be generally light.

Days 3-6 Weather Summary Heavy rain (total 133mm), heaviest during Sun morning. Warm (max 26°C on Sat afternoon, min 23°C on Sat night). Winds decreasing (fresh winds from the SE on Sat night, calm by Mon night).

Wed
01
Thursday
02
Friday
03
Saturday
04
Sunday
05
Monday
06
Tuesday
07
PMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAMPMNightAM
Rating
(10 max)
0
1
2
0
2
2
0
2
2
2
2
1
0
2
3
3
2
3
3
3
2
Swell
Height Map
See all maps
Wave Height (m) & direction (?)
0.5
SW
0.6
SSW
0.9
SSW
0.9
SSW
0.6
SW
1.2
SSW
1.1
SW
0.5
SSW
0.7
SSW
0.9
SSW
1.5
SW
1
SSW
0.9
SSW
0.6
SW
0.9
SW
0.7
SW
0.8
SSW
1.3
WSW
0.9
SW
0.8
SSW
0.8
SSW
Period(s) (?)1212147147719161671414181616158141816
Wave
Graph
(?)Metric surfscale
Energy kJ (?)7311130877114127112203250457206389293246371264294214305408346
Wind
(km/h)
5
SW
5
SE
5
SE
5
SSW
5
ESE
0
WSW
10
SW
10
E
15
SE
20
SE
20
SE
20
SSE
15
SSW
10
SSW
10
SE
10
SSE
5
SSE
5
SE
5
SW
10
SE
10
S
Wind State (?)
onshore
cross-onshore
cross-shore
cross-offshore
offshore
glassy
cross-
on		cross-
off		glasscrossglassglasscross-
on		offcross-
off		cross-
off		cross-
off		cross-
off		cross-
on		crosscross-
off		cross-
off		cross-
off		cross-
off		glasscross-
off		cross
High Tide
/ height (m)
9:42PM
1.71
10:01AM
1.86
10:51PM
1.81
11:09AM
1.93
11:50PM
1.98
12:08PM
2.05
12:40AM
2.20
1:01PM
2.19
1:25AM
2.42
1:49PM
2.33
2:09AM
2.62
2:35PM
2.44
2:54AM
2.76
Low Tide
/ height (m)
3:25PM
0.78
3:41AM
0.90
4:32PM
0.75
4:56AM
0.83
5:31PM
0.65
5:59AM
0.68
6:22PM
0.52
6:53AM
0.48
7:08PM
0.37
7:41AM
0.28
7:53PM
0.23
8:27AM
0.10
8:38PM
0.11
9:13AM
-0.03
Wed
01
Thursday
02
Friday
03
Saturday
04
Sunday
05
Monday
06
Tuesday
07
Sunrise--5:31--5:31--5:31--5:31--5:31--5:31--5:31
Sunset5:32--5:32--5:31--5:30--5:30--5:30--5:30--
thunderstorm
mod rain
thunderstorm
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
heavy rain
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
Rain (mm)
8614524727494172021427123
Temp. °C272627272627272528262525252525262626252525
Feels °C (?)313031313132312929272526272828293030292929
  • 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 (calm at Juan Santamaria Airport 167 km from Ostional). 0.4m 12s groundswell from the SW with a 0.3m 12s groundswell from the SSW. 2 swells combining to make bigger set waves.

    1 hour 47 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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