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Marine Weather and Tide Forecast for New London, NH


August 18, 2026 2:07 PM EDT (18:07 UTC)
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Sunrise 5:55 AM   Sunset 7:44 PM
Moonrise 12:41 PM   Moonset 10:14 PM 
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NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.

Marine Forecasts
   
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NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
ANZ154 Coastal Waters From Cape Elizabeth, Me To Merrimack River, Ma Out 25 Nm- 802 Am Edt Tue Aug 18 2026

Today - NE winds around 5 kt. Seas around 2 ft. Wave detail: se 2 ft at 6 seconds. Areas of fog early this morning, then patchy fog late this morning. Vsby 1 nm or less, increasing to 1 to 3 nm late this morning.

Tonight - SE winds around 5 kt, becoming sw after midnight. Seas 2 to 4 ft. Wave detail: se 3 ft at 9 seconds. Patchy fog in the evening. Patchy fog after midnight with vsby 1 nm or less.

Wed - SW winds around 5 kt, becoming S in the afternoon. Seas 2 to 4 ft. Wave detail: se 3 ft at 9 seconds.

Wed night - SW winds 5 to 10 kt, becoming W after midnight. Seas 2 to 3 ft. Wave detail: se 3 ft at 7 seconds.

Thu - NW winds around 5 kt, becoming se in the afternoon. Seas 2 to 3 ft. Wave detail: se 3 ft at 7 seconds.

Thu night - S winds around 5 kt, becoming N after midnight. Seas around 2 ft. Wave detail: se 2 ft at 8 seconds.

Fri - NE winds around 5 kt. Seas around 2 ft.

Fri night - SE winds around 5 kt, becoming N after midnight. Seas around 2 ft.

Sat - E winds 5 to 10 kt. Seas around 2 ft. A chance of showers in the afternoon.

Sat night - E winds 5 to 10 kt. Seas around 2 ft. A chance of showers.
ANZ100 802 Am Edt Tue Aug 18 2026

Synopsis for stonington me to merrimack river ma out to 60 nm - High pressure slides south into midweek, with a cold front approaching the waters Wednesday evening. High pressure then returns for the end of the week.

7 Day Forecast for Marine Location Near New London, NH
   
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NEW! Add second zone forecast

Tide / Current for Dover, Cocheco River, Piscataqua River, New Hampshire
  
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Dover
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Tue -- 05:22 AM EDT     6.94 feet High Tide
Tue -- 05:52 AM EDT     Sunrise
Tue -- 11:22 AM EDT     0.52 feet Low Tide
Tue -- 12:36 PM EDT     Moonrise
Tue -- 05:45 PM EDT     7.44 feet High Tide
Tue -- 07:41 PM EDT     Sunset
Tue -- 10:10 PM EDT     Moonset
Tue -- 11:57 PM EDT     0.50 feet Low Tide
Tide / Current data from XTide NOT FOR NAVIGATION
        
  Sorry, Dover, Cocheco River, Piscataqua River, New Hampshire does not exist in database. Press Edit above and select a valid nearby location.

Dover, Cocheco River, Piscataqua River, New Hampshire, Tide feet
12
am
0.7
1
am
1.9
2
am
3.4
3
am
5
4
am
6.2
5
am
6.9
6
am
6.8
7
am
5.8
8
am
4.4
9
am
2.9
10
am
1.5
11
am
0.6
12
pm
0.7
1
pm
1.8
2
pm
3.3
3
pm
4.9
4
pm
6.3
5
pm
7.2
6
pm
7.4
7
pm
6.8
8
pm
5.4
9
pm
3.9
10
pm
2.3
11
pm
1

Tide / Current for Squamscott River RR. Bridge, Piscataqua River, New Hampshire
  
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Squamscott River RR. Bridge
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Tue -- 12:15 AM EDT     0.22 feet Low Tide
Tue -- 05:52 AM EDT     Sunrise
Tue -- 06:05 AM EDT     6.84 feet High Tide
Tue -- 12:30 PM EDT     0.56 feet Low Tide
Tue -- 12:35 PM EDT     Moonrise
Tue -- 06:26 PM EDT     7.16 feet High Tide
Tue -- 07:41 PM EDT     Sunset
Tue -- 10:11 PM EDT     Moonset
Tide / Current data from XTide NOT FOR NAVIGATION
        
  Sorry, Squamscott River RR. Bridge, Piscataqua River, New Hampshire does not exist in database. Press Edit above and select a valid nearby location.

Squamscott River RR. Bridge, Piscataqua River, New Hampshire, Tide feet
12
am
0.2
1
am
0.5
2
am
1.6
3
am
3.3
4
am
5.1
5
am
6.4
6
am
6.8
7
am
6.6
8
am
5.6
9
am
4.2
10
am
2.6
11
am
1.3
12
pm
0.6
1
pm
0.7
2
pm
1.5
3
pm
3.1
4
pm
4.9
5
pm
6.3
6
pm
7.1
7
pm
7.1
8
pm
6.3
9
pm
5
10
pm
3.5
11
pm
2

Area Discussion for Gray/Portland, ME
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FXUS61 KGYX 181032 AFDGYX

Area Forecast Discussion National Weather Service Gray ME 632 AM EDT Tue Aug 18 2026

WHAT HAS CHANGED
Areas of dense fog have settled into much of the Midcoast so have decided to issue an SPS here through 13z. We've seen widespread visibility observations here of a half mile or less.
Patchy fog continues elsewhere. No major changes were needed for this update.

KEY MESSAGES
1. A weak cold front will sag into the forecast area early this morning and stall. This will aid in the development of scattered showers today. Early morning fog will be present also.
A cold front approaches late Wednesday but weakens.

2. Low-impact weather is expected mid to late week, with a couple chances for light rain.

DISCUSSION
KEY MESSAGE 1 DESCRIPTION...

A weak cold front will remain stalled across the forecast area today. After early morning fog (some possibly locally dense)
and a few showers, we'll expect variable clouds. In addition the weak front should provide modest convergence to allow for widely scattered convective showers and isolated thunderstorms to develop. Nothing strong or severe expected. Dewpoint values will be up there though, making it feel quite muggy.

The return of fog is expected again tonight, some of it possibly locally dense as the moist airmass remains stagnant.

Wednesday will be a warmer day and feature more sunshine as well. It will also be drier in terms of mugginess. A cold front will approach from the west late in the day. However, timing seems such that it will be too late to deliver any sort of thunderstorm activity.

KEY MESSAGE 2 DESCRIPTION...

If the front continues to slow as the parent low occludes east of Hudson Bay, then it may wind up draped across the forecast area or just to the east. This would be the eventual pathway for low pressure across the Ohio Valley to track into the latter half of the week. Thus precip chances Thursday and Friday could eventually be in flux.

High pressure should be nearing the region come the weekend, but there will be the complicating factor of the slow moving boundary exiting, mentioned above, and a potential cut off low or trough arriving from the west. The combination of the low and return flow could spell for a damp period across much of the Northeast, but anticipate some slowing of the low's transit east which could help the first half of the weekend remain dry.

AVIATION /12Z TUESDAY THROUGH SATURDAY/
THROUGH WEDNESDAY...Widespread LIFR/IFR restrictions continue early this morning in low clouds and fog. Fog should start to lift over the next hour or two. Isolated afternoon showers may lead to brief restrictions but timing/coverage uncertainty precludes mention at any specific site forecast for now. IFR conditions are once again expected in fog tonight into early Wednesday morning.

Outlook...

Thursday: Mostly VFR. Some low ceilings are possible NW of the mountains for terminals such as HIE with SHRA. Also can't rule out lower ceilings or fog towards Penobscot Bay.

Thursday night and Friday: VFR, no sig wx.

Saturday: VFR likely, no sig wx.

MARINE
Winds and seas likely remain below SCA levels through the rest of the week. Areas of fog will be possible through Thursday. A cold front approaches the waters midweek, as a wave of low pressure passes south of New England and into the Gulf of Maine or open Atlantic. High pressure builds in for the end of the week and into the weekend, before another front likely approaches by late weekend.

GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...None.


Weather Reporting Stations
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Wind History for Portland, ME
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Airport Reports
   
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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KLEB Lebanon Municipal Airport US23 sm14 mincalm10 smA Few Clouds79°F63°F58%29.88

Weather Map
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GEOS Local Image of north east  
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Portland, ME,





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