Avellanas Rivermouth Surf Break
Lat Long: 10.24° N 85.84° W

Avellanas Rivermouth Surf Forecast and Surf Report

Weather Forecast for Avellanas Rivermouth

Issued: 11 am 03 Jun 2026 (local time)

Forecast update in  hr  min

Today's Avellanas Rivermouth sea temperature is
30.6° C

1.9°C warmer than normal for this time of year

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


Avellanas Rivermouth surf forecast from 3 Jun 2026:

  • Best quality surf: Monday 8 Jun, 6PM (local time) - 6.5ft (2.0m), 19s period, SSW swell with glassy winds.
  • Most powerful swell: Monday 8 Jun, 6PM (local time) - 6.5ft (2.0m), 19s period, SSW swell with 2,725 kJ wave energy.
  • Next surfable swell (1★+): Wednesday 3 Jun, 3PM (local time) - 4.5ft (1.4m), 18s period with SW swell.

Best Forecast Surf Conditions for Avellanas Rivermouth this week:

The surf forecast for Avellanas Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Wednesday (Jun 03) at 3PM. The primary swell is predicted to be 1.4m and 18s period with a secondary swell of 0.6m and 10s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Avellanas Rivermouth in the next 16 days are 2.0m 19s and forecast to arrive on Monday (Jun 08) at 6PM. Winds are predicted to be glassy at the time the swell arrives.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+) 3PM (Wed 3rd Jun)4.5ft (1.4m) 18s
Best Surf 6PM (Mon 8th Jun)6.5ft (2.0m) 19s
Most Powerful 6PM (Mon 8th Jun)6.5ft (2.0m) 19s

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


Updates in  hr  min  s Forecast update imminent

Short Range Forecast

Heavy rain (total 57mm), heaviest during Fri night. Warm (max 30°C on Wed morning, min 25°C on Fri night). Wind will be generally light.

Days 4-6 Weather Summary

Heavy rain (total 70mm), heaviest during Sat afternoon. Warm (max 27°C on Sun morning, min 23°C on Sun night). Winds increasing (calm on Sat night, fresh winds from the WSW by Sun night).

Wednesday
3
Thursday
4
Friday
5
Saturday
6
Sunday
7
Monday
8
Tuesday
9
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
4
3
3
3
3
4
4
4
4
4
4
4
3
2
3
4
3
3
4
4
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
1.2
SW
15
1.4
SW
18
1.5
SW
18
1.2
SW
18
1.4
SW
16
1.7
SW
18
1.7
SW
17
1.7
SW
17
1.6
SW
16
1.5
SW
16
1.5
SW
16
1.3
SW
16
1.2
SW
15
1.2
SW
14
0.9
SSW
21
1.3
SSW
19
1.9
SSW
19
1.8
SSW
18
1.9
SSW
17
1.7
SSW
17
1.4
SSW
16
Wave Graph
Metric surfscale
Energy kJ
631
1227
1351
973
894
1842
1722
1682
1401
1115
1074
773
631
614
799
1255
2573
2024
2171
1734
933
Wind (km/h)
0
SE
10
SW
10
SSE
5
E
15
SW
5
ESE
5
S
5
WSW
5
WSW
15
SW
20
W
5
WSW
15
WSW
20
SW
25
SW
10
SE
5
ESE
5
ENE
5
NNE
10
SW
5
SE
Wind State
glassy
cross-off
cross
on
cross-off
on
glassy
cross-off
glassy
cross-off
off
off
cross-off
cross-off
cross-off
cross-on
cross-on
cross-on
cross-on
cross-off
glassy
High Tide
4:40PM2.25m
5:16AM2.07m
5:19PM2.19m
5:56AM2.05m
5:58PM2.12m
6:37AM2.04m
6:39PM2.04m
7:19AM2.05m
7:24PM1.97m
8:04AM2.08m
8:16PM1.92m
8:53AM2.13m
9:13PM1.89m
Low Tide
10:31AM0.55m
11:03PM0.35m
11:11AM0.60m
11:40PM0.40m
11:52AM0.66m
00:18AM0.46m
12:35PM0.71m
00:57AM0.52m
1:23PM0.73m
1:38AM0.58m
2:15PM0.73m
2:25AM0.61m
3:13PM0.69m
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
thunderstorm
thunderstorm
thunderstorm
thunderstorm
thunderstorm
mod rain
cloud
part cloud
part cloud
part cloud
rain showers
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:20
5:20
5:20
5:20
5:20
5:20
5:20
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
6:01
6:01
6:01
6:02
6:02
6:02
6:02
 mm
3
4
10
5
4
5
7
3
16
7
11
14
7
8
17
6
4
Temp °C
30
29
26
29
27
26
28
29
28
26
26
26
27
26
26
24
25
25
29
28
27
Feels °C
35
32
29
32
29
30
32
33
32
28
27
28
29
27
28
26
28
28
32
30
30
Swell 1
Height (m)
Direction
Period (s)
1.2
SW
15
1.4
SW
18
1.5
SW
18
1.2
SW
18
1.4
SW
16
1.7
SW
18
1.7
SW
17
1.7
SW
17
1.6
SW
16
1.5
SW
16
1.5
SW
16
1.3
SW
16
2.2
WSW
8
1.2
SW
14
1.6
WSW
8
1.7
WSW
10
1.8
WSW
10
1.8
SSW
18
1.9
SSW
17
1.7
W
11
1.5
W
10
Energy kJ
631
1227
1351
973
894
1842
1722
1682
1401
1115
1074
773
605
614
368
596
721
2024
2171
694
467
Swell 2
Height (m)
Direction
Period (s)
0.8
SW
19
0.6
S
10
0.8
SSW
5
1.1
SW
15
1
SW
19
0.7
SSW
6
0.6
S
6
0.6
SSW
14
0.7
SW
6
0.8
SW
6
0.9
SSW
7
0.6
W
9
1.2
SW
15
0.5
SW
23
1.2
SW
14
1.3
SSW
19
1.9
SSW
19
1.8
WSW
10
1.7
W
11
1.7
SSW
17
1.4
SSW
16
Energy kJ
446
70
30
509
723
39
29
147
39
46
68
57
631
268
606
1255
2573
641
694
1734
933
Swell 3
Height (m)
Direction
Period (s)
0.6
S
10
0.1
NW
15
0.4
SW
21
0.9
SSW
6
0.9
SSW
6
0.6
SSW
14
0.6
SSW
14
0.5
S
6
0.5
S
13
0.4
SSW
13
0.4
SSW
12
0.3
SSW
12
0.4
SW
24
0.5
SW
23
0.9
SSW
21
1.1
SW
14
0.4
S
6
0.6
S
8
0.6
S
8
Energy kJ
75
8
162
55
55
149
143
19
86
55
46
28
143
268
799
463
12
41
41
Wind waves
Height (m)
Direction
Period (s)
2.2
WSW
8
2
WSW
8
Energy kJ
581
488
Nearest Offshore or Glassy
Rating
(10 max)
4
4
4
4
4
4
4
4
4
4
4
4
4
3
3
4
5
4
4
4
4
Distance (km)
0
0
1
1
100
1
0
0
0
0
0
0
0
209
121
1
1
1
1
0
0
Best forecast wave conditions in Guanacaste
Rating
(10 max)
4
4
4
4
4
4
4
4
4
4
4
4
4
5
4
4
4
4
Best forecast wave conditions in Costa Rica
Rating
(10 max)
4
4
4
4
2
4
4
4
4
4
4
4
4
3
4
5
5
4
5
4
4
Header Global
Rating
(10 max)
5
4
5
5
5
9
9
7
9
9
8
6
8
7
6
7
6
5
7
9
5
  • 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 Avellanas Rivermouth Surf forecast

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

Avellanas Rivermouth is 44 km (27 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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