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

40°F

4°C

Humidity 70%
Wind Speed NE 13 mph
Barometer 30.14 in (1020.8 mb)
Dewpoint 31°F (-1°C)
Visibility 10.00 mi
Wind Chill32°F (0°C)
Last update 11 Mar 8:51 am EDT
Extended Forecast for

Trefethen ME

  • Today

    Today: A 50 percent chance of showers. Patchy fog before 1pm, then areas of fog after 5pm. Otherwise, mostly cloudy, with a high near 39. East wind around 15 mph, with gusts as high as 20 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 39 °F

    Chance
    Showers and
    Areas Fog

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm before 5am, then a chance of showers and thunderstorms after 5am. Areas of dense fog. Otherwise, cloudy, with a low around 38. South wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 38 °F

    Showers
    Likely and
    Areas Dense
    Fog

  • Thursday

    Thursday: A 30 percent chance of rain. Patchy fog before 9am. Otherwise, mostly cloudy, with a temperature rising to near 44 by 9am, then falling to around 36 during the remainder of the day. Breezy, with a west wind 15 to 20 mph, with gusts as high as 25 mph. New precipitation amounts of less than a tenth of an inch possible.

    High: 44 °F⇓

    Chance Rain
    and Patchy
    Fog

  • Thursday Night

    Thursday Night: A chance of snow between 7pm and 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29. West wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.

    Low: 29 °F

    Chance Snow
    then Mostly
    Clear

  • Friday

    Friday: Mostly sunny, with a high near 39. West wind 10 to 15 mph becoming south in the afternoon. Winds could gust as high as 25 mph.

    High: 39 °F

    Mostly Sunny

  • Friday Night

    Friday Night: A chance of snow before 9pm, then a chance of rain and snow between 9pm and 11pm, then rain likely after 11pm. Mostly cloudy, with a low around 34. Breezy. Chance of precipitation is 60%.

    Low: 34 °F

    Breezy.
    Rain/Snow
    Likely then
    Rain Likely

  • Saturday

    Saturday: Partly sunny, with a high near 43. Breezy.

    High: 43 °F

    Partly Sunny
    and Breezy

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 27.

    Low: 27 °F

    Partly Cloudy

  • Sunday

    Sunday: Mostly cloudy, with a high near 39.

    High: 39 °F

    Mostly Cloudy

Detailed Forecast

Today
A 50 percent chance of showers. Patchy fog before 1pm, then areas of fog after 5pm. Otherwise, mostly cloudy, with a high near 39. East wind around 15 mph, with gusts as high as 20 mph. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Showers likely and possibly a thunderstorm before 5am, then a chance of showers and thunderstorms after 5am. Areas of dense fog. Otherwise, cloudy, with a low around 38. South wind 5 to 15 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday
A 30 percent chance of rain. Patchy fog before 9am. Otherwise, mostly cloudy, with a temperature rising to near 44 by 9am, then falling to around 36 during the remainder of the day. Breezy, with a west wind 15 to 20 mph, with gusts as high as 25 mph. New precipitation amounts of less than a tenth of an inch possible.
Thursday Night
A chance of snow between 7pm and 8pm. Mostly cloudy, then gradually becoming mostly clear, with a low around 29. West wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 30%.
Friday
Mostly sunny, with a high near 39. West wind 10 to 15 mph becoming south in the afternoon. Winds could gust as high as 25 mph.
Friday Night
A chance of snow before 9pm, then a chance of rain and snow between 9pm and 11pm, then rain likely after 11pm. Mostly cloudy, with a low around 34. Breezy. Chance of precipitation is 60%.
Saturday
Partly sunny, with a high near 43. Breezy.
Saturday Night
Partly cloudy, with a low around 27.
Sunday
Mostly cloudy, with a high near 39.
Sunday Night
A chance of snow between 7pm and 11pm, then rain and snow likely. Cloudy, with a low around 34. Chance of precipitation is 60%.
Monday
Rain. High near 51. Breezy. Chance of precipitation is 90%.
Monday Night
A 50 percent chance of rain. Mostly cloudy, with a low around 31. Breezy.
Tuesday
Sunny, with a high near 36.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Trefethen ME
 43.68°N 70.2°W (Elev. 16 ft)
Last Update:
8:25 am EDT Mar 11, 2026
Forecast Valid:
9am EDT Mar 11, 2026-6pm EDT Mar 17, 2026
 
Forecast Discussion
 
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Additional Resources

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Chance of Precipitation