Water Temperature of the St. Croix River in Calais, ME

Current Water Temperature

76.1°F

Measurement Time: Thursday, August 7, 2025, 6:45 PM EDT

Temperature Locations

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Local Points of Interest

St. Stephen, NB

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St. Croix River

Station Name: St. Croix River at Milltown, Maine
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 62 feet / 19 meters

Nearest Address:
531 North St
Calais, ME 04619
Washington County

GPS Coordinates: 45.17, -67.2966667

Nearby Water Temperatures

Lewy Lake, Princeton, ME (14.2 mi)
Grand Lake Stream, Grand Lake Stream, ME (23.5 mi)
Gulf of Maine, Eastport, ME (23.9 mi)
Narraguagus River, Cherryfield, ME (49.8 mi)
Penobscot River, Eddington, ME (72.4 mi)
Meduxnekeag River, Houlton, ME (74.0 mi)
Piscataquis River, Guilford, ME (98.3 mi)
Ducktrap River, Lincolnville, ME (104.2 mi)
Sheepscot River, Whitefield, ME (130.4 mi)
Gulf of Maine, Monhegan, ME (142.9 mi)
Allagash River, Allagash, ME (156.6 mi)
St. John River, Saint Francis, ME (157.1 mi)
Gulf of Maine, Portland, ME (179.1 mi)
Gulf of Maine, Cape Elizabeth, ME (180.7 mi)
Wild River, Gilead, ME (188.5 mi)

Weather for Calais, Maine

Current Weather

57°F
Clear
Conditions: Clear
Humidity: 92%
Feels Like: 57.1°F
Wind: WSW 3.8 mph
Wind Gusts: 8 mph
Pressure: 30.27 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 6 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Thu
H: 85°F
L: 54°F
Partly Cloudy
Fri
H: 84°F
L: 53°F
Sunny
Sat
H: 84°F
L: 55°F
Sunny
Sun
H: 87°F
L: 55°F
Sunny
Mon
H: 88°F
L: 58°F

Air Quality

AQI: 1 - Good
PM2.5: 8.85 μg/m3
PM10: 9.41 μg/m3
Carbon Monoxide: 287.68 μg/m3
Nitrogen Dioxide: 2.95 μg/m3
Sulphur Dioxide: 1.66 μg/m3
Ozone: 68 μg/m3

Astronomical

Sunrise: 5:21 AM
Sun Transit: 12:34 AM
Sunset: 7:48 PM
Daylight: 14 hrs 26 mins
Moonrise: 7:19 PM
Moon Transit: 11:39 PM
Moonset: 2:54 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.4%

Best Times for Fishing or Hunting

Major Periods

1:50 PM - 4:20 PM
12:00 AM - 12:00 AM

Minor Periods

6:49 PM - 8:19 PM
2:24 AM - 3:54 AM

Action Rating: 2 out of 5

Beach Hazards Statement issued August 7 at 3:18PM EDT until August 8 at 8:00PM EDT by NWS Caribou ME

Effective: Thu August 7, 2025, 3:18 PM
Expires: Fri August 8, 2025, 5:00 AM

* WHAT....The warm air temperatures in the mid 70s to around 80 may cause people to underestimate the danger of the cold water temperatures which are currently in the mid 50s. * WHERE...Coastal Hancock and Coastal Washington Counties. * WHEN...From Friday morning through Friday evening. * IMPACTS...The cold water temperatures can quickly cause hypothermia to anyone in the water. Anyone on a boat or paddlecraft should use extreme caution.

A Beach Hazards Statement is issued on days when a significant number of boats and paddlecraft are expected to be out on the water and when warm air temperatures may cause people to underestimate the danger of the cold water. Paddle smart from the start. Always wear your life jacket. Be aware of wind conditions, tides, and localized currents.
Thursday, August 7, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 70.7°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 8.5 mph
UV Index: 1.8

Air Quality

AQI: 1 - Good
PM2.5: 6.79 μg/m3
PM10: 6.95 μg/m3
Carbon Monoxide: 303.02 μg/m3
Nitrogen Dioxide: 3.22 μg/m3
Sulphur Dioxide: 1.81 μg/m3
Ozone: 77.84 μg/m3

Astronomical

Sunrise: 5:21 AM
Sun Transit: 12:34 AM
Sunset: 7:48 PM
Daylight: 14 hrs 26 mins
Moonrise: 7:19 PM
Moon Transit: 11:39 PM
Moonset: 2:54 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.4%

Best Times for Fishing or Hunting

Major Periods

1:50 PM - 4:20 PM
12:00 AM - 12:00 AM

Minor Periods

6:49 PM - 8:19 PM
2:24 AM - 3:54 AM

Action Rating: 2 out of 5

Friday, August 8, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 67.6°F
Average Humidity: 79%
Chance of Rain: 0%
Wind: 10.3 mph
UV Index: 1.9

Air Quality

AQI: 1 - Good
PM2.5: 14.24 μg/m3
PM10: 15.07 μg/m3
Carbon Monoxide: 310.1 μg/m3
Nitrogen Dioxide: 2.88 μg/m3
Sulphur Dioxide: 1.84 μg/m3
Ozone: 92.04 μg/m3

Astronomical

Sunrise: 5:22 AM
Sun Transit: 12:34 AM
Sunset: 7:46 PM
Daylight: 14 hrs 24 mins
Moonrise: 7:48 PM
Moon Transit: 12:00 AM
Moonset: 4:07 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
2:43 PM - 5:13 PM

Minor Periods

7:18 PM - 8:48 PM
3:37 AM - 5:07 AM

Action Rating: 5 out of 5

Saturday, August 9, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 67.8°F
Average Humidity: 69%
Chance of Rain: 0%
Wind: 10.5 mph
UV Index: 1.9

Air Quality

AQI: 1 - Good
PM2.5: 9.9 μg/m3
PM10: 10.49 μg/m3
Carbon Monoxide: 268.57 μg/m3
Nitrogen Dioxide: 2.27 μg/m3
Sulphur Dioxide: 1.51 μg/m3
Ozone: 88.52 μg/m3

Astronomical

Sunrise: 5:24 AM
Sun Transit: 12:34 AM
Sunset: 7:45 PM
Daylight: 14 hrs 21 mins
Moonrise: 8:13 PM
Moon Transit: 12:31 AM
Moonset: 5:23 AM
Moon Phase: Full
Moon Illumination: 99.0%

Best Times for Fishing or Hunting

Major Periods

12:01 AM - 2:31 AM
3:34 PM - 6:04 PM

Minor Periods

7:43 PM - 9:13 PM
4:53 AM - 6:23 AM

Action Rating: 4 out of 5

Sunday, August 10, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 68.9°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 9.6 mph
UV Index: 1.8

Air Quality

AQI: 2 - Moderate
PM2.5: 15.87 μg/m3
PM10: 18.23 μg/m3
Carbon Monoxide: 275.14 μg/m3
Nitrogen Dioxide: 2.43 μg/m3
Sulphur Dioxide: 2.16 μg/m3
Ozone: 91.68 μg/m3

Astronomical

Sunrise: 5:25 AM
Sun Transit: 12:34 AM
Sunset: 7:43 PM
Daylight: 14 hrs 18 mins
Moonrise: 8:34 PM
Moon Transit: 1:20 AM
Moonset: 6:41 AM
Moon Phase: Full
Moon Illumination: 95.5%

Best Times for Fishing or Hunting

Major Periods

12:50 AM - 3:20 AM
4:22 PM - 6:52 PM

Minor Periods

8:04 PM - 9:34 PM
6:11 AM - 7:41 AM

Action Rating: 4 out of 5

Monday, August 11, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 71.4°F
Average Humidity: 58%
Chance of Rain: 0%
Wind: 6.7 mph
UV Index: 1.9

Air Quality

AQI: 1 - Good
PM2.5: 14.89 μg/m3
PM10: 18.16 μg/m3
Carbon Monoxide: 293.21 μg/m3
Nitrogen Dioxide: 2.94 μg/m3
Sulphur Dioxide: 2.26 μg/m3
Ozone: 99.08 μg/m3

Astronomical

Sunrise: 5:26 AM
Sun Transit: 12:34 AM
Sunset: 7:42 PM
Daylight: 14 hrs 16 mins
Moonrise: 8:53 PM
Moon Transit: 2:08 AM
Moonset: 7:57 AM
Moon Phase: Waning Gibbous
Moon Illumination: 89.6%

Best Times for Fishing or Hunting

Major Periods

1:38 AM - 4:08 AM
5:10 PM - 7:40 PM

Minor Periods

8:23 PM - 9:53 PM
7:27 AM - 8:57 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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