Water Temperature of the Gulf of Maine in Portland, ME

Current Water Temperature

51.6°F

Measurement Time: Thursday, May 21, 2026, 11:42 PM EDT

Today's Tides

 High: May 21, 2:59 AM, 10.9 ft
Low: May 21, 9:30 AM, -0.8 ft
 High: May 21, 3:51 PM, 9.4 ft
Low: May 21, 9:45 PM, 0.7 ft

Temperature Locations

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Local Points of Interest

Fore River; Portland Harbor; Port of Portland; Bug Light Park; Fort Allen Park

Gulf of Maine

Station Name: Portland
Data Source: NOAA Tides and Currents

Elevation Above Sea Level: 26 feet

Sensor Depth: -8 feet

Nearest Address:
98 Ocean Gateway Pier
Portland, ME 04101
Cumberland County

GPS Coordinates: 43.65806, -70.24417

Nearby Water Temperatures

Gulf of Maine, Cape Elizabeth, ME (10.6 mi)
Gulf of Maine, Monhegan, ME (44.6 mi)
Piscataqua River, Kittery, ME (47.1 mi)
Sheepscot River, Whitefield, ME (50.7 mi)
Gulf of Maine, Gloucester, NH (59.4 mi)
Wild River, Gilead, ME (62.4 mi)
Ducktrap River, Lincolnville, ME (74.9 mi)
Atlantic Ocean, Scituate, MA (93 mi)
Shawsheen River, Bedford, MA (97.3 mi)
Cambridge Reservoir Tributary 2, Lexington, MA (98.8 mi)
Cambridge Reservoir Tributary 1, Lexington, MA (98.9 mi)
Hobbs Brook, Lincoln, MA (99 mi)
Fresh Pond, Cambridge, MA (99.1 mi)
Cambridge Reservoir Tributary 3, Waltham, MA (99.7 mi)
Cambridge Reservoir, Lincoln, MA (99.9 mi)

Weather for Portland, Maine

Current Weather

51.1°F
Partly cloudy
Partly cloudy
47.7°F
51.7°F
52%
NNW 8.9 mph
15.1 mph
48.9°F
33.2°F
0 in
75%
9 mi
1026 mbar
1

Five Day Weather Forecast

Sunny
Thu
H: 65°F
L: 52°F
Sunny
Fri
H: 63°F
L: 47°F
Partly Cloudy
Sat
H: 58°F
L: 51°F
Patchy rain nearby
Sun
H: 56°F
L: 45°F
Patchy rain nearby
Mon
H: 51°F
L: 46°F

Air Quality

AQI: 1 - Good
PM2.5: 5.35 μg/m3
PM10: 5.85 μg/m3
Carbon Monoxide: 144.85 μg/m3
Nitrogen Dioxide: 5.95 μg/m3
Sulphur Dioxide: 1.45 μg/m3
Ozone: 61 μg/m3

Astronomical

Sunrise: 5:10 AM
Sun Transit: 12:37 AM
Sunset: 8:06 PM
Daylight: 14 hrs 56 mins
Moonrise: 9:58 AM
Moon Transit: 5:39 PM
Moonset: 12:34 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

7:25 AM - 9:55 AM
5:09 PM - 7:39 PM

Minor Periods

9:28 AM - 10:58 AM
12:04 AM - 1:34 AM

Action Rating: 3 out of 5

Frost Advisory issued May 21 at 2:45PM EDT until May 22 at 8:00AM EDT by NWS Gray ME

Effective: Thu May 21, 2026, 2:45 PM
Expires: Fri May 22, 2026, 2:45 AM

* WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...In Maine, Central Somerset, Interior Cumberland Highlands, Southern Franklin, and Southern Oxford Counties. In New Hampshire, Sullivan, Northern Carroll, Southern Carroll, Southern Grafton, and Cheshire Counties. * WHEN...From 11 PM this evening to 8 AM EDT Friday. * IMPACTS...Frost could harm sensitive outdoor vegetation. Sensitive outdoor plants may be killed if left uncovered.

Take steps now to protect tender plants from the cold.
Thursday, May 21, 2026

Weather Forecast

Sunny
64.9°F
51.8°F
58°F
45%
0 in
0%
0%
12.5 mph
1.6


Air Quality

AQI: 1 - Good
PM2.5: 2.88 μg/m3
PM10: 3.26 μg/m3
Carbon Monoxide: 134.45 μg/m3
Nitrogen Dioxide: 2.97 μg/m3
Sulphur Dioxide: 1.39 μg/m3
Ozone: 75.08 μg/m3

Astronomical

Sunrise: 5:10 AM
Sun Transit: 12:37 AM
Sunset: 8:06 PM
Daylight: 14 hrs 56 mins
Moonrise: 9:58 AM
Moon Transit: 5:39 PM
Moonset: 12:34 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

7:25 AM - 9:55 AM
5:09 PM - 7:39 PM

Minor Periods

9:28 AM - 10:58 AM
12:04 AM - 1:34 AM

Action Rating: 3 out of 5

Friday, May 22, 2026

Weather Forecast

Sunny
63.4°F
46.6°F
55.5°F
49%
0 in
0%
0%
12.5 mph
4


Air Quality

AQI: 1 - Good
PM2.5: 4.82 μg/m3
PM10: 5.54 μg/m3
Carbon Monoxide: 134.61 μg/m3
Nitrogen Dioxide: 3.91 μg/m3
Sulphur Dioxide: 1.3 μg/m3
Ozone: 74.44 μg/m3

Astronomical

Sunrise: 5:09 AM
Sun Transit: 12:37 AM
Sunset: 8:07 PM
Daylight: 14 hrs 58 mins
Moonrise: 11:15 AM
Moon Transit: 6:30 PM
Moonset: 1:06 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

8:18 AM - 10:48 AM
6:00 PM - 8:30 PM

Minor Periods

10:45 AM - 12:15 AM
12:36 AM - 2:06 AM

Action Rating: 3 out of 5

Saturday, May 23, 2026

Weather Forecast

Partly Cloudy
57.7°F
50.6°F
53.8°F
58%
0 in
0%
0%
9.6 mph
4


Air Quality

AQI: 1 - Good
PM2.5: 6.99 μg/m3
PM10: 8.35 μg/m3
Carbon Monoxide: 157.21 μg/m3
Nitrogen Dioxide: 6.53 μg/m3
Sulphur Dioxide: 1.48 μg/m3
Ozone: 61.92 μg/m3

Astronomical

Sunrise: 5:08 AM
Sun Transit: 12:37 AM
Sunset: 8:08 PM
Daylight: 15 hrs mins
Moonrise: 12:28 AM
Moon Transit: 7:16 PM
Moonset: 1:30 AM
Moon Phase: First Quarter
Moon Illumination: 44.4%

Best Times for Fishing or Hunting

Major Periods

9:06 AM - 11:36 AM
6:46 PM - 9:16 PM

Minor Periods

11:58 AM - 1:28 PM
1:00 AM - 2:30 AM

Action Rating: 2 out of 5

Sunday, May 24, 2026

Weather Forecast

Patchy rain nearby
56.4°F
45.4°F
52.1°F
60%
0.07 in
64%
0%
9.4 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 11.18 μg/m3
PM10: 16.23 μg/m3
Carbon Monoxide: 114.88 μg/m3
Nitrogen Dioxide: 4.86 μg/m3
Sulphur Dioxide: 1.53 μg/m3
Ozone: 65.88 μg/m3

Astronomical

Sunrise: 5:07 AM
Sun Transit: 12:37 AM
Sunset: 8:09 PM
Daylight: 15 hrs 2 mins
Moonrise: 1:37 PM
Moon Transit: 8:00 PM
Moonset: 1:51 AM
Moon Phase: First Quarter
Moon Illumination: 55.7%

Best Times for Fishing or Hunting

Major Periods

9:51 AM - 12:21 AM
7:30 PM - 10:00 PM

Minor Periods

1:07 PM - 2:37 PM
1:21 AM - 2:51 AM

Action Rating: 2 out of 5

Monday, May 25, 2026

Weather Forecast

Patchy rain nearby
51.1°F
45.7°F
49°F
93%
0.17 in
78%
0%
11.4 mph
2


Air Quality

AQI: 1 - Good
PM2.5: 7.96 μg/m3
PM10: 12.05 μg/m3
Carbon Monoxide: 129.67 μg/m3
Nitrogen Dioxide: 3.34 μg/m3
Sulphur Dioxide: 1.37 μg/m3
Ozone: 61.69 μg/m3

Astronomical

Sunrise: 5:07 AM
Sun Transit: 12:37 AM
Sunset: 8:10 PM
Daylight: 15 hrs 3 mins
Moonrise: 2:44 PM
Moon Transit: 8:41 PM
Moonset: 2:10 AM
Moon Phase: First Quarter
Moon Illumination: 66.7%

Best Times for Fishing or Hunting

Major Periods

10:33 AM - 1:03 PM
8:11 PM - 10:41 PM

Minor Periods

2:14 PM - 3:44 PM
1:40 AM - 3:10 AM

Action Rating: 3 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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