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

12 Day Weather and Surf, issued 1 am Tuesday 16 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 16.1° C
(Which is slightly cooler than normal)

Best Forecast Surf Conditions for Costellos this week:

The surf forecast for Costellos over the next 12 days: The first swell (rated 1 star or higher) is forecast to arrive on Tuesday (Sep 16) at 5AM. The primary swell is predicted to be 0.6m and 8s period with a secondary swell of 0.1m and 10s. The wind is predicted to be cross-offshore as the swell arrives.

The most powerful waves expected at Costellos in the next 12 days are 0.7m 13s and forecast to arrive on Sunday (Sep 21) at 11PM. Winds are predicted to be cross-offshore at the time the swell arrives. The largest open ocean swell (not directed at the beach) is 1.0m 5s period and expected on Sunday (Sep 21) at 11PM.

Wave Type	Time (EDT) & Date	Wave Height & Period
Next good surf (1 star+)	5AM (Tue 16th Sep)	2ft (0.6m) 8s
Best Surf	5AM (Tue 16th Sep)	2ft (0.6m) 8s
Most Powerful	11PM (Sun 21st Sep)	2.5ft (0.7m) 13s

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

Updates in hr min s Forecast update imminent

12 Days Hourly

Print Table

	Short Range Forecast Mostly dry. Warm (max 25°C on Thu afternoon, min 15°C on Tue night). Wind will be generally light.									Days 3-6 Weather Summary Mostly dry. Warm (max 22°C on Fri morning, min 10°C on Fri night). Wind will be generally light.
	Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22
	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night	AM	PM	Night
Rating (10 max)	0	0	1	0	0	1	1	0	1	0	1	0	0	0	0	1	0	0	0	1	1
Swell Height Map See all maps
Wave Height (m) & direction (?)	ESE	E	E	SE	SE	SE	SE	SE	SE	SE	ESE	NNE	NE	ESE	ESE	ESE	SE	SE	SE	SE	SE
Period(s) (?)	8	7	7	11	9	9	9	9	8	8	8	5	4	7	16	14	13	12	12	12	11
Wave Graph (?)
Energy (?)	68	45	53	57	64	74	77	76	120	54	98	58	54	27	42	109	132	173	156	159	127
Wind (km/h)	E	ESE	WNW	SE	SE	SW	SSW	S	W	NNW	WNW	N	NNE	SSE	SW	SSW	SSE	SW	SW	SSW	SW
Wind State (?) onshore cross-onshore cross-shore cross-offshore offshore glassy	on	cross- on	cross- off	cross- on	cross- on	cross- off	cross- off	cross	off	cross- off	off	cross	cross	cross- on	cross- off	cross- off	cross	cross- off	cross- off	cross- off	cross- off
High Tide / height (m)		7:30PM 3.24		8:18AM 2.94		8:34PM 3.25	9:16AM 3.02		9:31PM 3.29	10:06AM 3.12		10:21PM 3.33	10:50AM 3.22		11:07PM 3.34	11:30AM 3.30		11:49PM 3.33	12:08PM 3.34		12:29AM 3.29
Low Tide / height (m)	1:12PM 0.86		2:02AM 0.55		2:19PM 0.82	3:01AM 0.52		3:18PM 0.73	3:53AM 0.48		4:10PM 0.63	4:39AM 0.45		4:56PM 0.53		5:20AM 0.45	5:39PM 0.46		5:58AM 0.47	6:19PM 0.42

	Tuesday 16			Wednesday 17			Thursday 18			Friday 19			Saturday 20			Sunday 21			Monday 22
Sunrise	6:22	-	-	6:24	-	-	6:24	-	-	6:26	-	-	6:26	-	-	6:28	-	-	6:28	-	-
Sunset	-	6:52	-	-	6:50	-	-	6:47	-	-	6:45	-	-	6:44	-	-	6:43	-	-	6:40	-

Rain (mm)	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-	-
Temp. °C	18	18	17	17	18	17	21	25	24	22	21	18	13	15	14	15	18	16	19	27	23
Feels °C (?)	17	17	16	16	16	15	20	23	22	19	20	13	9	10	10	11	13	11	15	25	21

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 (calm at Portsmouth/Pease Airport 13 km from Costellos). A 0.6m swell from the ESE
1 hour 49 minutes ago Costellos

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1 h 49 min ago

0 km/h

Clean

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The surf report / weather widget below is available to embed on third party websites free of charge and provides a summary of our Costellos surf forecast. Simply grab the html code snippet that we provide and paste it into your own site. You can choose your preferred language and metric/imperial units for the surf forecast feed to suit users of your site. Click here to get the code.

Information about the Costellos Surf forecast

The above surf forecast table for Costellos provides essential information for determining whether the surfing conditions will be good over the next 12 days. A general guide to surfing at Costellos can be found by selecting the local surf guide option on the grey menu. Our Costellos 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 (Costellos) 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 Costellos 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.

Costellos is 5 km (3 miles) from Hampton. If you plan a vacation in New Hampshire, look for hotels and other accommodation in Hampton. Hampton has rooms for a wide range of budgets as well as car hire and transport links.