Marine Weather and Tide Forecast for South Portland, ME
 | Sunrise 5:13 AM Sunset 8:20 PM Moonrise 6:26 AM Moonset 9:30 PM |
Marine Forecasts
NOTE: Zones updated 4/16/2026. Some zones changed. Use Edit if needed.
ANZ153 Casco Bay- 803 Am Edt Wed Jul 15 2026
Today - W winds 5 to 10 kt, becoming nw 10 to 15 kt with gusts up to 20 kt this afternoon. Seas 2 to 3 ft. Isolated showers early this morning. Hazy late this morning and early afternoon.
Tonight - NW winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt after midnight. Seas 2 to 3 ft.
Thu - W winds 10 to 15 kt. Seas around 2 ft.
Thu night - NW winds 10 to 15 kt with gusts up to 20 kt, becoming W 5 to 10 kt after midnight. Seas around 2 ft.
Fri - W winds 5 to 10 kt. Seas around 2 ft.
Fri night - W winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas around 2 ft in the evening, then 1 foot or less.
Sat - SW winds around 5 kt, becoming S in the afternoon. Seas 1 foot or less, then around 2 ft in the afternoon. A chance of showers in the afternoon.
Sat night - S winds 10 to 15 kt, becoming sw 5 to 10 kt after midnight. Seas around 2 ft. Showers likely with a chance of tstms.
Sun - NW winds 5 to 10 kt, becoming W in the afternoon. Seas around 2 ft. A chance of showers in the morning.
Sun night - SW winds 5 to 10 kt, diminishing to around 5 kt after midnight. Seas around 2 ft.
winds and seas higher in and near tstms.
winds and seas higher in and near tstms.
ANZ100 803 Am Edt Wed Jul 15 2026
Synopsis for stonington me to merrimack river ma out to 60 nm - Winds shift offshore today as a front pushes east of the waters. Sub-sca conditions are expected on the waters through the weekend.
7 Day Forecast for Marine Location Near South Portland, ME
NEW! Add second zone forecast
| Fore River Click for Map Wed -- 05:13 AM EDT Sunrise Wed -- 06:17 AM EDT -1.35 feet Low Tide Wed -- 06:27 AM EDT Moonrise Wed -- 12:33 PM EDT 9.76 feet High Tide Wed -- 06:25 PM EDT -0.15 feet Low Tide Wed -- 08:20 PM EDT Sunset Wed -- 09:29 PM EDT Moonset Tide / Current data from XTide NOT FOR NAVIGATION |
Fore River, Casco Bay, Maine, Tide feet
| 12 am |
| 11.4 |
| 1 am |
| 10.5 |
| 2 am |
| 8.3 |
| 3 am |
| 5.3 |
| 4 am |
| 2.2 |
| 5 am |
| -0.2 |
| 6 am |
| -1.3 |
| 7 am |
| -1 |
| 8 am |
| 0.6 |
| 9 am |
| 3.3 |
| 10 am |
| 6.1 |
| 11 am |
| 8.3 |
| 12 pm |
| 9.6 |
| 1 pm |
| 9.6 |
| 2 pm |
| 8.4 |
| 3 pm |
| 6.2 |
| 4 pm |
| 3.5 |
| 5 pm |
| 1.2 |
| 6 pm |
| -0 |
| 7 pm |
| 0.1 |
| 8 pm |
| 1.5 |
| 9 pm |
| 4 |
| 10 pm |
| 7 |
| 11 pm |
| 9.6 |
| Fore River Click for Map Flood direction 229 true Ebb direction 65 true Wed -- 01:23 AM EDT -0.35 knots Max Ebb Wed -- 03:12 AM EDT -0.22 knots Min Ebb Wed -- 05:13 AM EDT -0.31 knots Max Ebb Wed -- 05:13 AM EDT Sunrise Wed -- 06:27 AM EDT Moonrise Wed -- 07:26 AM EDT 0.00 knots Slack Wed -- 09:29 AM EDT 0.49 knots Max Flood Wed -- 12:22 PM EDT -0.00 knots Slack Wed -- 02:15 PM EDT -0.33 knots Max Ebb Wed -- 03:13 PM EDT -0.32 knots Min Ebb Wed -- 05:09 PM EDT -0.41 knots Max Ebb Wed -- 07:36 PM EDT 0.00 knots Slack Wed -- 08:20 PM EDT Sunset Wed -- 09:29 PM EDT Moonset Wed -- 09:40 PM EDT 0.56 knots Max Flood Tide / Current data from XTide NOT FOR NAVIGATION |
Fore River, Portland River Bridge (depth 5 ft), Casco Bay, Maine Current, knots
| 12 am |
| -0.1 |
| 1 am |
| -0.3 |
| 2 am |
| -0.3 |
| 3 am |
| -0.2 |
| 4 am |
| -0.3 |
| 5 am |
| -0.3 |
| 6 am |
| -0.3 |
| 7 am |
| -0.1 |
| 8 am |
| 0.2 |
| 9 am |
| 0.5 |
| 10 am |
| 0.5 |
| 11 am |
| 0.3 |
| 12 pm |
| 0.1 |
| 1 pm |
| -0.2 |
| 2 pm |
| -0.3 |
| 3 pm |
| -0.3 |
| 4 pm |
| -0.3 |
| 5 pm |
| -0.4 |
| 6 pm |
| -0.4 |
| 7 pm |
| -0.2 |
| 8 pm |
| 0.1 |
| 9 pm |
| 0.5 |
| 10 pm |
| 0.5 |
| 11 pm |
| 0.4 |
Area Discussion for Gray/Portland, ME
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FXUS61 KGYX 150955 AFDGYX
Area Forecast Discussion National Weather Service Gray ME 555 AM EDT Wed Jul 15 2026
WHAT HAS CHANGED
The threat for severe thunderstorms has ended so the watch has been cancelled. Remaining showers are rapidly exiting the area so refined PoPs to reflect that at well. There still remains a chance for additional showers and thunderstorms this afternoon, but if thick smoke concentrations remain overhead we may see this stunted once again. The aviation section has also been updated for the 12Z TAFs.
KEY MESSAGES
1. Overnight instability and shear still support occasional instances of strong to severe thunderstorms through early this morning. These should be focused across far southern Maine and central to southern New Hampshire.
2. Additional cold fronts will approach today and again Thursday, bringing chances for showers and storms and a slight cooling trend into the weekend.
DISCUSSION
KEY MESSAGE 1 DESCRIPTION...
Overnight instability remains in place, albeit mostly elevated, through early morning. A 500mb jet exit region will nose into northern New England over the next few hours, providing lift and kinematic support for strong to severe thunderstorms.
Storm lifecycles have been fairly routine through last evening and into the overnight hours, but coverage has been very difficult to forecast and message. 00z GYX RAOB displayed a very stout cap aloft, but with an EML above. This setup is rare for the region, and while significant widespread severe has not come to fruition, it bears watching given the parameter space should a storm take advantage of it.
The approaching jet may provide that extra lift needed to bypass the cap's ability to wilt compromised updrafts. Thus think the ongoing Severe Thunderstorm Watch(es) is warranted considering upstream activity now passing through Upstate NY.
KEY MESSAGE 2 DESCRIPTION...
Troughing will deepen over the eastern U.S. today through the end of the week. Northwesterly winds behind a cold front will usher in a drier airmass later today despite warm high temperatures. One thing to watch will be lingering Canadian wildfire smoke, which had a significant impact on high temperatures yesterday. Should this remain, then high temperatures today will likely fall a couple degrees cooler.
There is the potential a few showers and thunderstorms both this afternoon and again Thursday afternoon with perhaps some severe potential, although on a localized scale.
High pressure builds in Friday for fair weather. A short wave moving within the long wave trough over eastern North America will approach over the weekend. This will bring increasing chances for showers late Saturday into Sunday morning.
AVIATION /12Z WEDNESDAY THROUGH SUNDAY/
Through 12z Thursday...A cold front crossing this morning has bring an end to shower and thunderstorm chances, but will increase NW winds gusts to around 25 kt through the evening. Additional SHRA/TS chance this afternoon, but isolated. VFR continues into this evening and tonight with precip coverage decreasing.
Outlook:
Thursday-Saturday: Mainly VFR conditions with WNW flow prevailing. SHRA/TSRA Thursday afternoon/evening may bring TEMPO restrictions.
Saturday night-Sunday: Chances for rain may bring a period of at least MVFR.
MARINE
Another cold front crosses Thursday with SW winds increasing ahead of the front and then shifting offshore Friday morning.
Winds and seas likely remain below SCA thresholds into the weekend.
GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...None
Area Forecast Discussion National Weather Service Gray ME 555 AM EDT Wed Jul 15 2026
WHAT HAS CHANGED
The threat for severe thunderstorms has ended so the watch has been cancelled. Remaining showers are rapidly exiting the area so refined PoPs to reflect that at well. There still remains a chance for additional showers and thunderstorms this afternoon, but if thick smoke concentrations remain overhead we may see this stunted once again. The aviation section has also been updated for the 12Z TAFs.
KEY MESSAGES
1. Overnight instability and shear still support occasional instances of strong to severe thunderstorms through early this morning. These should be focused across far southern Maine and central to southern New Hampshire.
2. Additional cold fronts will approach today and again Thursday, bringing chances for showers and storms and a slight cooling trend into the weekend.
DISCUSSION
KEY MESSAGE 1 DESCRIPTION...
Overnight instability remains in place, albeit mostly elevated, through early morning. A 500mb jet exit region will nose into northern New England over the next few hours, providing lift and kinematic support for strong to severe thunderstorms.
Storm lifecycles have been fairly routine through last evening and into the overnight hours, but coverage has been very difficult to forecast and message. 00z GYX RAOB displayed a very stout cap aloft, but with an EML above. This setup is rare for the region, and while significant widespread severe has not come to fruition, it bears watching given the parameter space should a storm take advantage of it.
The approaching jet may provide that extra lift needed to bypass the cap's ability to wilt compromised updrafts. Thus think the ongoing Severe Thunderstorm Watch(es) is warranted considering upstream activity now passing through Upstate NY.
KEY MESSAGE 2 DESCRIPTION...
Troughing will deepen over the eastern U.S. today through the end of the week. Northwesterly winds behind a cold front will usher in a drier airmass later today despite warm high temperatures. One thing to watch will be lingering Canadian wildfire smoke, which had a significant impact on high temperatures yesterday. Should this remain, then high temperatures today will likely fall a couple degrees cooler.
There is the potential a few showers and thunderstorms both this afternoon and again Thursday afternoon with perhaps some severe potential, although on a localized scale.
High pressure builds in Friday for fair weather. A short wave moving within the long wave trough over eastern North America will approach over the weekend. This will bring increasing chances for showers late Saturday into Sunday morning.
AVIATION /12Z WEDNESDAY THROUGH SUNDAY/
Through 12z Thursday...A cold front crossing this morning has bring an end to shower and thunderstorm chances, but will increase NW winds gusts to around 25 kt through the evening. Additional SHRA/TS chance this afternoon, but isolated. VFR continues into this evening and tonight with precip coverage decreasing.
Outlook:
Thursday-Saturday: Mainly VFR conditions with WNW flow prevailing. SHRA/TSRA Thursday afternoon/evening may bring TEMPO restrictions.
Saturday night-Sunday: Chances for rain may bring a period of at least MVFR.
MARINE
Another cold front crosses Thursday with SW winds increasing ahead of the front and then shifting offshore Friday morning.
Winds and seas likely remain below SCA thresholds into the weekend.
GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...None
| Stations | Dist | Age | Wind | Air | Water | Waves | inHg | DewPt |
| CASM1 - 8418150 - Portland, ME | 3 mi | 70 min | NW 2.9G | 80°F | 61°F | 29.64 | ||
| 44007 - PORTLAND 12 NM Southeast of Portland,ME | 12 mi | 50 min | WSW 7.8G | 68°F | 58°F | 2 ft | 29.67 | 65°F |
| WEXM1 - Wells Reserve, ME | 25 mi | 70 min | W 1.9 | 78°F | 70°F | |||
| 44030 - Buoy B0102 - Western Maine Shelf | 33 mi | 190 min | WSW 9.7G | 73°F | ||||
| SEIM1 | 46 mi | 70 min | 78°F | 66°F | 29.71 | 69°F |
Wind History for Portland, ME
toggle option: (graph/table)
Link to 5 hour of 5 minute data for KPWM
Terminal Aerodrome Forecast (TAF) for KPWM
Wind History Graph: PWM
(wind in knots)
GEOS Local Image of north east
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Portland, ME,
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