Costellos Surf Forecast

/ New Hampshire (9 breaks) / New Hampshire (9 breaks) /

USA (1297 breaks) / Lat Long: (42.95° N 70.78° W)

Surf Forecasts:

Costellos surfForecast / New Hampshire / USA

48hr Weather and Surf, issued 7 pm Wednesday 17 Sep 2025 EDT

Forecast update in hr min s Forecast update imminent

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

Today's Costellos sea temperature is 15.6° C
(Which is 1.2°C colder than average for this time of year)

How big are the waves at Costellos today?

The current surf forecast for Costellos at 12AM is: 0.7m 8s primary swell from a Southeast direction and 0.2m 6s secondary swell from a East direction (forecast issued at 07:00pm September 17). The wind direction is predicted to be glassy.

Time (EDT) & Date	Wave Height	Wave Period
Morning (18 Sep)	-	-
Afternoon (18 Sep)	1.5ft (0.4m)	7s
Evening (18 Sep)	2ft (0.6m)	9s

Table - waves today at Costellos. (Swell directed towards the surf break)

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Wednesday 17			Thursday 18								Friday 19								Saturday 20
	5 PM	8 PM	11 PM	2 AM	5 AM	8 AM	11 AM	2 PM	5 PM	8 PM	11 PM	2 AM	5 AM	8 AM	11 AM	2 PM	5 PM	8 PM	11 PM	2 AM	5 AM	8 AM	11 AM	2 PM
Rating (10 max)	0	0	1	1	1	1	1	0	0	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0
Swell Height Map See all maps
Wave Height (m) & direction (?)	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	SE	ESE	ESE	SE	NNE	NNE	SE	NE	SE
Period(s) (?)	7	9	9	8	8	8	7	8	8	8	8	8	7	7	7	7	7	7	7	5	5	8	5	8
Wave Graph (?)
kJ (?)	26	64	76	60	67	67	39	34	75	82	82	79	65	53	39	38	31	31	24	54	31	15	26	16
Wind (km/h)	ESE	ESE	ENE	NNW	NNW	NNW	SSW	SSE	SSE	SSW	W	WNW	WNW	WNW	NNW	E	NNE	NW	NNE	N	NNE	NE	ENE	ESE
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	on	on	glass	cross- off	cross- off	glass	glass	cross	cross- on	cross- off	off	off	cross- off	cross- off	cross- off	glass	glass	cross- off	cross	cross	cross	cross- on	on	cross- on
High Tide / height (m)			8:34PM 3.25				9:16AM 3.02				9:31PM 3.29				10:06AM 3.12				10:21PM 3.33				10:50AM 3.22
Low Tide / height (m)	2:19PM 0.82				3:01AM 0.52				3:18PM 0.73				3:53AM 0.48				4:10PM 0.63				4:39AM 0.45

	Wednesday 17			Thursday 18								Friday 19								Saturday 20
Sunrise	-	-	-	-	-	6:24	-	-	-	-	-	-	-	6:26	-	-	-	-	-	-	-	6:26	-	-
Sunset	6:50	-	-	-	-	-	-	-	6:47	-	-	-	-	-	-	-	6:45	-	-	-	-	-	-	-

Rain (mm)	-	-	-	2	2	1	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Temp. °C	17	16	17	16	15	16	18	22	22	20	20	20	19	18	22	21	21	19	16	14	13	12	13	14
Feels °C (?)	16	17	19	17	15	17	19	22	21	20	18	17	17	16	21	21	21	17	11	10	9	8	9	10

Map Icons:
Break
Live Wave Height (m)
Live Wind Speed (km/h)
Surf Rating (10 Max)
Ocean Swells (m)
Wind Speed (km/h)

Recent Eyeball Surf Reports for New Hampshire

Wind Update Continuing clean conditions at Costellos (light winds from the SSE at Portsmouth/Pease Airport 13 km from Costellos). 0.6m 7s swell from the SE with a 0.2m 7s swell from the E. 2 swells combining to make bigger set waves.
2 hours 38 minutes ago Costellos

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2 h 38 min ago

6 km/h

SSE

Clean

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