Guiones Surf Break

Lat Long: 9.93° N 85.67° W

Guiones Surf Forecast and Surf Report

Issued: 11 am 29 Aug 2026 (local time)

Forecast update in  hr  min

Today's Guiones sea temperature is
30.2°C
2.0° 

Guiones surf forecast is for near shore open water. Breaking waves will often be smaller at less exposed spots.


Guiones surf forecast from 30 Aug 2026:

  • Best quality surf: Saturday 29 Aug, 9PM (local time) - 5ft (1.6m), 16s period, SW swell with glassy winds.
  • Most powerful swell: Friday 4 Sep, 6PM (local time) - 5.5ft (1.7m), 17s period, SW swell with 1,567 kJ wave energy.
  • Next surfable swell (1★+): Saturday 29 Aug, 9PM (local time) - 5ft (1.6m), 16s period with SW swell.

Best Forecast Surf Conditions for Guiones this week:

The surf forecast for Guiones over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Saturday (Aug 29) at 9PM. The primary swell is predicted to be 1.6m and 16s period with a secondary swell of 0.7m and 6s. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Guiones in the next 16 days are 1.7m 17s and forecast to arrive on Friday (Sep 04) at 6PM. Winds are predicted to be cross-shore at the time the swell arrives.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+) 9PM (Sat 29th Aug)5ft (1.6m) 16s
Best Surf 9PM (Sat 29th Aug)5ft (1.6m) 16s
Most Powerful 6PM (Fri 4th Sep)5.5ft (1.7m) 17s

Table - best surf conditions forecast for Guiones over the next 16 days.


The Lowdown

Alright folks, Rusty here. Let’s get into it. We’ve got a solid 16-day window for Guiones, and it’s going to be a story of two halves. The first week is where the main action is, with some proper groundswell and clean conditions. The second week settles down but still offers some tidy, smaller waves for the longboard or a fun mid-length.

The water is sitting at a warm 86°, which is a touch warmer than normal for this time of year – you’ll be in boardshorts or a spring suit, no worries there.

The best of the best is the Saturday morning, August 29th. We’re looking at 5ft of SW groundswell with a very long 16-second period. That’s a lot of energy pushing in (1198 combined energy) and with a light offshore breeze from the ENE, it’s going to be clean and lined up. This is proper, experienced surfer territory – the size and power are for the crew who know what they’re doing. This is the standout, no question.

Sunday morning, August 30th, is still pumping with 5ft SW swell and a 14-second period, and the offshore wind sticks around. It’s a bit less energy than Saturday (956), but the quality is still high. The real hidden gem, though, is the Friday morning, September 4th. We get a jump in energy again (1342) with 5ft SW groundswell at 17 seconds, and it’s glassy. That’s a morning for some proper, shoulder-to-head-high waves with no wind at all.

After that, the swell drops off a bit as we move into the second week, but don’t write it off. The mornings from September 10th, 11th, and 12th are all glassy with 3ft to 4ft of SW groundswell. It’s cleaner and smaller, perfect for a sunrise session without the rush. The 16th day, September 13th, offers a crisp 3ft SW swell with a clean offshore breeze – a nice, mellow way to wrap up the outlook.

The afternoons are a write-off though. Almost every single one gets a cross-on or onshore wind, and the risk of thunderstorms is high. The surf gets choppy and messy after lunch, so plan for dawn patrols. The big swells at the start are no joke – over 5ft, this is a step up from beginner territory. And with that long period, the sets will be powerful and spaced out, so paddling out is easier, but the take-off is more critical.

This is a classic promising run for Guiones. The first week is the one to circle on the calendar. Keep an eye on the glassy mornings – that’s where the magic is.

Rusty.

Short Range Forecast

Moderate rain (total 11mm), heaviest on Sun afternoon. Warm (max 31°C on Sat morning, min 26°C on Sat night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 20mm), heaviest during Tue morning. Warm (max 29°C on Wed morning, min 26°C on Wed night). Wind will be generally light.

Saturday
29
Sunday
30
Monday
31
Tuesday
1
Wednesday
2
Thursday
3
Friday
4
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
4
2
4
3
1
3
2
0
2
2
1
2
3
1
3
2
1
4
4
3
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.5
SW
16
1.6
SW
16
1.6
SW
15
1.5
SW
14
1.5
SW
14
1.3
SW
14
1.1
SW
13
1.1
SW
13
1
SW
13
1
SW
12
0.9
SW
12
0.9
SW
12
0.9
SW
13
0.8
SW
16
0.8
SW
16
0.8
SW
16
0.9
SW
15
1.3
SW
18
1.4
SW
17
1.6
SW
17
1.6
SW
16
Wave Graph
Metric surfscale
Energy kJ
1123
1314
1105
899
899
630
451
386
331
301
252
220
246
326
314
299
380
984
1174
1519
1314
Wind (km/h)
10
ENE
10
SW
5
ENE
10
ENE
15
SW
5
NE
5
E
10
SW
5
E
5
ESE
20
SSE
10
ESE
5
N
10
WSW
0
WNW
5
NE
10
SSW
5
NE
5
E
10
SSW
5
SSE
Wind State
off
cross-on
glassy
off
cross-on
glassy
glassy
cross-on
cross-off
cross-off
cross
cross-off
glassy
on
glassy
glassy
cross-on
glassy
glassy
cross-on
glassy
High Tide
3:32PM2.12m
3:53AM2.23m
4:09PM2.13m
4:28AM2.28m
4:46PM2.11m
5:05AM2.29m
5:25PM2.07m
5:45AM2.27m
6:08PM1.99m
6:29AM2.20m
6:56PM1.90m
7:20AM2.11m
7:53PM1.81m
Low Tide
9:26AM0.32m
9:39PM0.23m
10:04AM0.26m
10:14PM0.21m
10:42AM0.22m
10:50PM0.22m
11:21AM0.22m
11:28PM0.25m
12:04PM0.25m
00:10AM0.31m
12:51PM0.32m
00:59AM0.40m
1:47PM0.40m
1:57AM0.49m
part cloud
part cloud
part cloud
clear
thunderstorm
thunderstorm
part cloud
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
part cloud
thunderstorm
thunderstorm
part cloud
thunderstorm
clear
thunderstorm
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:33
5:33
5:33
5:33
5:33
5:33
5:33
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:52
5:52
5:52
5:51
5:51
5:50
5:50
 mm
3
2
3
3
5
2
4
2
4
3
1
5
3
Temp °C
31
29
28
30
29
28
29
28
27
28
28
27
29
29
27
29
29
28
29
29
28
Feels °C
34
32
33
31
32
33
32
31
32
32
30
30
32
33
32
31
32
34
34
33
33
  • Map Icons:
  • Break
  • Live Wave Height (m)
  • Live Wind Speed (km/h)
  • Surf Rating (10 Max)
  • Ocean Swells (m)
  • Wind Speed (km/h)
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Information about the Guiones Surf forecast

The above surf forecast table for Guiones provides essential information for determining whether the surfing conditions will be good over the next 16 days. A general guide to surfing at Guiones can be found by selecting the local surf guide option on the grey menu. Our Guiones 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 (Guiones) 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 Guiones 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.

Guiones is 34 km (21 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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