National Weather Service Forecast for: Belfast ME
Issued by: National Weather Service Gray/Portland, ME
Updated: 2:25 am EDT Aug 20, 2026
 
Today

Today: Patchy fog between 8am and 10am. Otherwise, partly sunny, with a high near 80. Calm wind becoming south around 5 mph in the afternoon.
Areas Fog
then Partly
Sunny
 Tonight

Tonight: Cloudy during the early evening, then gradual clearing, with a low around 57. Calm wind.
Gradual
Clearing
 Friday

Friday: Sunny, with a high near 80. North wind around 5 mph becoming southeast in the afternoon.
Sunny

 Friday
Night
Friday Night: Partly cloudy, with a low around 54. Calm wind.
Partly Cloudy

 Saturday

Saturday: A 40 percent chance of showers after 2pm. Mostly cloudy, with a high near 74. Light northeast wind becoming southeast 5 to 10 mph in the morning.
Mostly Cloudy
then Chance
Showers
 Saturday
Night
Saturday Night: Showers, mainly before 2am. Low around 57. Chance of precipitation is 80%.
Showers

 Sunday

Sunday: Showers likely, mainly between 10am and noon. Mostly cloudy, with a high near 75. Chance of precipitation is 60%.
Showers
Likely
 Sunday
Night
Sunday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 50%.
Chance
T-storms
 Monday

Monday: Partly sunny, with a high near 78.
Partly Sunny
Hi 80 °F Lo 57 °F Hi 80 °F Lo 54 °F Hi 74 °F Lo 57 °F Hi 75 °F Lo 61 °F Hi 78 °F

 

Today
 
 Patchy fog between 8am and 10am. Otherwise, partly sunny, with a high near 80. Calm wind becoming south around 5 mph in the afternoon.
Tonight
 
 Cloudy during the early evening, then gradual clearing, with a low around 57. Calm wind.
Friday
 
 Sunny, with a high near 80. North wind around 5 mph becoming southeast in the afternoon.
Friday Night
 
 Partly cloudy, with a low around 54. Calm wind.
Saturday
 
 A 40 percent chance of showers after 2pm. Mostly cloudy, with a high near 74. Light northeast wind becoming southeast 5 to 10 mph in the morning.
Saturday Night
 
 Showers, mainly before 2am. Low around 57. Chance of precipitation is 80%.
Sunday
 
 Showers likely, mainly between 10am and noon. Mostly cloudy, with a high near 75. Chance of precipitation is 60%.
Sunday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 50%.
Monday
 
 Partly sunny, with a high near 78.
Monday Night
 
 Partly cloudy, with a low around 56.
Tuesday
 
 Sunny, with a high near 76.
Tuesday Night
 
 Mostly clear, with a low around 55.
Wednesday
 
 Sunny, with a high near 78.

 

Forecast from NOAA-NWS for Belfast ME.