Damas Rivermouth Surf Break

Lat Long: 9.49° N 84.33° W

Damas Rivermouth Surf Forecast and Surf Report

Issued: 5 pm 17 Sep 2026 (local time)

Forecast update in  hr  min

Today's Damas Rivermouth sea temperature is
30.2°C
2.1° 

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


Damas Rivermouth surf forecast from 18 Sep 2026:

  • Best quality surf: Sunday 20 Sep, 9AM (local time) - 2.5ft (0.8m), 19s period, SW swell with glassy winds.
  • Most powerful swell: Sunday 20 Sep, 9AM (local time) - 2.5ft (0.8m), 19s period, SW swell with 446 kJ wave energy.
  • Next surfable swell (1★+): Friday 18 Sep, 12AM (local time) - 2ft (0.6m), 14s period with SW swell.

Best Forecast Surf Conditions for Damas Rivermouth this week:

The surf forecast for Damas Rivermouth over the next 16 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Sep 18) at 12AM. The primary swell is predicted to be 0.6m and 14s period with a secondary swell of 0.6m and 9s. Another secondary swell of 0.3m and 5s is also forecast. The wind is predicted to be glassy as the swell arrives.

The most powerful waves expected at Damas Rivermouth in the next 16 days are 0.8m 19s and forecast to arrive on Sunday (Sep 20) at 9AM. Winds are predicted to be glassy at the time the swell arrives.

Wave TypeTime (CST) & Date Wave Height & Period
Next good surf (1 star+)12AM (Fri 18th Sep)2ft (0.6m) 14s
Best Surf 9AM (Sun 20th Sep)2.5ft (0.8m) 19s
Most Powerful 9AM (Sun 20th Sep)2.5ft (0.8m) 19s

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


Short Range Forecast

Heavy rain (total 21mm), heaviest during Thu afternoon. Warm (max 29°C on Thu afternoon, min 26°C on Thu night). Wind will be generally light.

Days 5-7 Weather Summary

Heavy rain (total 92mm), heaviest during Mon night. Warm (max 29°C on Sun afternoon, min 24°C on Mon night). Wind will be generally light.

Thu
17
Friday
18
Saturday
19
Sunday
20
Monday
21
Tuesday
22
Wednesday
23
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
AM
PM
Night
Rating
(10 max)
1
2
2
1
2
2
1
2
3
2
1
3
2
0
3
1
3
1
1
2
Swell
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Height Map
Wave
Height (m)
Direction
Period (s)
0.8
SW
14
0.4
SW
21
0.4
SW
20
0.4
SW
20
0.5
SW
20
0.5
SW
19
0.4
SW
21
0.6
SW
18
0.8
SW
19
0.8
SW
19
0.7
SW
18
0.8
SW
18
0.8
SW
18
0.8
SW
16
0.8
SW
16
0.8
SW
16
0.8
SW
16
0.7
SW
16
0.7
SW
15
0.8
SW
15
Wave Graph
Metric surfscale
Energy kJ
245
160
138
138
186
183
159
269
446
441
304
437
432
318
371
306
357
239
229
301
Wind (km/h)
10
S
5
N
5
SSE
10
SSW
5
N
5
S
10
SSW
5
NNE
5
SSW
10
SSW
5
E
5
ESE
10
SSE
10
ESE
0
NE
10
SSW
5
SE
10
SE
10
S
5
E
Wind State
on
glassy
glassy
cross-on
glassy
glassy
cross-on
cross-off
glassy
on
cross
glassy
on
cross-on
glassy
on
glassy
cross-on
on
glassy
High Tide
6:51PM2.17m
7:06AM2.26m
7:39PM2.01m
7:56AM2.11m
8:39PM1.89m
8:59AM2.01m
9:53PM1.85m
10:12AM1.98m
11:07PM1.91m
11:22AM2.03m
00:07AM2.04m
12:20PM2.13m
00:53AM2.21m
Low Tide
00:52AM0.70m
1:30PM0.67m
1:40AM0.85m
2:26PM0.80m
2:41AM0.97m
3:35PM0.87m
3:56AM1.03m
4:47PM0.87m
5:11AM0.98m
5:48PM0.79m
6:12AM0.87m
6:37PM0.68m
thunderstorm
part cloud
part cloud
thunderstorm
thunderstorm
clear
thunderstorm
thunderstorm
clear
thunderstorm
thunderstorm
cloud
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
rain showers
thunderstorm
thunderstorm
<span class="translation_missing" title="translation missing: en.weather_tables.sunrise">Sunrise</span>
5:26
5:26
5:26
5:26
5:26
5:26
<span class="translation_missing" title="translation missing: en.weather_tables.sunset">Sunset</span>
5:36
5:36
5:35
5:34
5:34
5:32
5:31
 mm
7
4
4
3
3
3
5
2
37
1
7
35
2
1
3
Temp °C
29
27
29
29
27
29
29
27
29
29
26
27
28
25
27
27
25
27
27
26
Feels °C
33
32
32
33
32
32
33
32
32
33
30
31
31
28
31
30
30
30
31
31
  • Map Icons:
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  • 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 Damas Rivermouth Surf forecast

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

Are you planning a holiday in Golfo de Nicoya? If you are looking for accommodation near Damas Rivermouth, camping, hotels and holiday cottages in Golfo de Nicoya, consider staying in Quepos which is 20 km (12 miles) away. Other places in and around Golfo de Nicoya where you can find information about places to rent, and car hire include Tejar which is 30 km (19 miles) away, San Rafael Abajo, Aserri and San Rafael Arriba.

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