Avellanas Rivermouth Surf Forecast

/ Guanacaste (28 surf breaks) /

Costa Rica (96 surf breaks) / Lat Long: (10.24° N 85.84° W)

Surf Forecasts:

Avellanas Rivermouth surfForecast / Guanacaste / Costa Rica

12 Day Weather and Surf, issued 5 am Friday 07 Nov 2025 CST

Forecast update in hr min s Forecast update imminent

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

Today's Avellanas Rivermouth sea temperature is 28.0° C
(Which is slightly warmer than usual)

Best Forecast Surf Conditions for Avellanas Rivermouth this week:

The surf forecast for Avellanas Rivermouth over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Friday (Nov 07) at 12PM. The primary swell is predicted to be 0.8m and 14s 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 Avellanas Rivermouth in the next 12 days are 1.1m 16s and forecast to arrive on Friday (Nov 14) at 6AM. Winds are predicted to be glassy at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 0.7m 5s period and expected on Wednesday (Nov 12) at 9AM.

Wave Type	Time (CST) & Date	Wave Height & Period
Next good surf (1 star+)	12PM (Fri 7th Nov)	2.5ft (0.8m) 14s
Best Surf	9AM (Thu 13th Nov)	2.5ft (0.8m) 17s
Most Powerful	6AM (Fri 14th Nov)	3.5ft (1.1m) 16s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Moderate rain (total 12mm), heaviest on Sun afternoon. Warm (max 28°C on Fri morning, min 24°C on Fri night). Wind will be generally light.									Days 3-6 Weather Summary Moderate rain (total 14mm), heaviest on Wed afternoon. Warm (max 28°C on Mon morning, min 24°C on Mon night). Wind will be generally light.
	Friday 07			Saturday 08			Sunday 09			Monday 10			Tuesday 11			Wednesday 12			Thursday 13
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
Rating (10 max)	2	2	2	2	2	2	1	2	1	0	1	1	0	1	2	0	2	2	3	3	3
Swell Height Map See all maps
Wave Height (m) & direction (?)	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW	SW
Period(s) (?)	14	14	14	13	13	13	18	16	16	15	15	15	16	16	14	14	14	16	17	16	16
Wave Graph (?)
kJ (?)	350	251	187	142	140	138	192	216	421	380	360	472	471	411	350	301	245	219	354	603	560
Wind (km/h)	ENE	WSW	ENE	NE	WNW	SE	ENE	W	E	ENE	NNE	ENE	ENE	NNE	NE	ENE	NNW	NW	WSW	WSW	S
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	on	cross- off	glass	glass	glass	glass	on	glass	on	cross- on	cross	cross- on	cross- on	cross- on	cross- on	cross- on	cross- off	glass	glass	off	glass
High Tide / height (m)		3:50PM 2.50		4:06AM 2.78	4:40PM 2.48		4:56AM 2.67	5:32PM 2.41		5:49AM 2.52		6:28PM 2.31	6:45AM 2.34		7:27PM 2.21	7:45AM 2.16		8:31PM 2.14	8:51AM 2.02		9:36PM 2.10
Low Tide / height (m)	9:39AM -0.12		9:51PM 0.07	10:28AM -0.10		10:42PM 0.12	11:19AM -0.02		11:36PM 0.23		12:12PM 0.11	12:33AM 0.38		1:07PM 0.27	1:36AM 0.52		2:07PM 0.42	2:44AM 0.63		3:10PM 0.53

	Friday 07			Saturday 08			Sunday 09			Monday 10			Tuesday 11			Wednesday 12			Thursday 13
Sunrise	5:35	-	-	5:35	-	-	5:35	-	-	5:35	-	-	5:35	-	-	5:37	-	-	5:37	-	-
Sunset	-	5:17	-	-	5:17	-	-	5:17	-	-	5:16	-	-	5:16	-	-	5:16	-	-	5:16	-

Rain (mm)	-	1	-	-	3	-	-	7	1	-	2	-	-	-	-	1	6	5	1	1	3
Temp. °C	28	27	26	28	28	26	28	27	26	28	28	25	28	28	25	27	28	25	27	27	25
Feels °C (?)	32	31	31	32	32	30	33	31	29	30	32	27	30	30	28	30	32	27	30	29	29

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 12 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.