National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Portland, Portland International Jetport (KPWM)

Lat: 43.64°NLon: 70.3°WElev: 72ft.

Mostly Cloudy

80°F

27°C

Humidity 56%
Wind Speed SE 9 mph
Barometer 29.96 in (1014.4 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Heat Index81°F (27°C)
Last update 20 Aug 12:51 pm EDT
Extended Forecast for

Trefethen ME

  • This Afternoon

    This Afternoon: Increasing clouds, with a high near 71. South wind 5 to 10 mph.

    High: 71 °F

    Increasing
    Clouds

  • Tonight

    Tonight: A slight chance of showers between 9pm and 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 60. Southwest wind around 5 mph becoming calm. Chance of precipitation is 20%.

    Low: 60 °F

    Slight Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 70. North wind 5 to 10 mph becoming southeast in the afternoon.

    High: 70 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Increasing clouds, with a low around 60. Southeast wind around 5 mph becoming calm.

    Low: 60 °F

    Increasing
    Clouds

  • Saturday

    Saturday: Showers likely, mainly after 3pm. Mostly cloudy, with a high near 66. East wind 5 to 15 mph. Chance of precipitation is 60%.

    High: 66 °F

    Showers
    Likely

  • Saturday Night

    Saturday Night: Showers, mainly before 2am. Low around 61. Chance of precipitation is 80%.

    Low: 61 °F

    Showers

  • Sunday

    Sunday: A 40 percent chance of showers. Mostly cloudy, with a high near 70.

    High: 70 °F

    Chance
    Showers

  • Sunday Night

    Sunday Night: A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 63.

    Low: 63 °F

    Chance
    Showers

  • Monday

    Monday: Mostly sunny, with a high near 74.

    High: 74 °F

    Mostly Sunny

Detailed Forecast

This Afternoon
Increasing clouds, with a high near 71. South wind 5 to 10 mph.
Tonight
A slight chance of showers between 9pm and 11pm. Cloudy, then gradually becoming partly cloudy, with a low around 60. Southwest wind around 5 mph becoming calm. Chance of precipitation is 20%.
Friday
Mostly sunny, with a high near 70. North wind 5 to 10 mph becoming southeast in the afternoon.
Friday Night
Increasing clouds, with a low around 60. Southeast wind around 5 mph becoming calm.
Saturday
Showers likely, mainly after 3pm. Mostly cloudy, with a high near 66. East wind 5 to 15 mph. Chance of precipitation is 60%.
Saturday Night
Showers, mainly before 2am. Low around 61. Chance of precipitation is 80%.
Sunday
A 40 percent chance of showers. Mostly cloudy, with a high near 70.
Sunday Night
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 63.
Monday
Mostly sunny, with a high near 74.
Monday Night
Mostly clear, with a low around 60.
Tuesday
Sunny, with a high near 73.
Tuesday Night
Mostly clear, with a low around 60.
Wednesday
Sunny, with a high near 73.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Trefethen ME
 43.68°N 70.2°W (Elev. 16 ft)
Last Update:
10:57 am EDT Aug 20, 2026
Forecast Valid:
1pm EDT Aug 20, 2026-6pm EDT Aug 26, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation